Entries |
Document | Title | Date |
20080218139 | VOLTAGE REGULATOR CIRCUIT AND CONTROL METHOD THEREFOR - A voltage regulator circuit and control method therefor. The circuit includes input and output terminals, an output transistor to pass a current from the input terminal to the output terminal according to a control signal, a reference voltage generator unit to generate and output a reference voltage, an output voltage detector unit to detect an output voltage output from the output terminal and generate and output a proportional voltage proportional to a detected voltage, a first error amplifier unit to control the output transistor to make the proportional voltage equal to the reference voltage, and a second error amplifier unit to respond to fluctuation in the output voltage faster than the first error amplifier unit and increase the output current from the output transistor for a period of time when the output voltage rapidly drops. Current consumption of the second error amplifier unit is changed according to the output current. | 09-11-2008 |
20080238385 | CONSTANT VOLTAGE CIRCUIT - A constant voltage circuit that is capable of realizing high speed response with respect to an abrupt change in an input voltage or a load current is disclosed. The constant voltage circuit includes a first error amplifier with a high direct current gain and a second error amplifier with high speed responsiveness with respect to a change in an output voltage. The constant voltage circuit uses the first and second error amplifiers to conduct operation control of an output voltage control transistor in response to a change in the output voltage. | 10-02-2008 |
20080252273 | DC/DC CONVERTER - The present invention is related to a dc/dc converter. A dc/dc converter according to the present invention comprises an inductor, a switch unit connected to both ends of the inductor and charging or retrieving an energy into the inductor, an output unit comprising an output switch unit outputting the energy charged in the inductor into an output end and a first comparison unit controlling an on-off of the output switch unit, a freewheeling switch unit connected to both ends of the inductor and returning a residual current remained in the inductor, a current sense unit sensing the residual current, an offset current generation unit generating an offset current, an error amplifier comparing the residual current inputted from the current sense unit to the offset current generated in the offset current unit and outputting the error signal, and a control unit controlling the switch unit with the error signal inputted from the error amplifier. | 10-16-2008 |
20080265853 | LINEAR VOLTAGE REGULATING CIRCUIT WITH UNDERSHOOT MINIMIZATION AND METHOD THEREOF - A voltage regulating circuit for providing a regulated output voltage. The voltage regulating circuit includes a voltage regulator, a converting circuit, a capacitive device, a first current mirror module, and a second current mirror module. The voltage regulator has a first output producing the regulated output voltage and a second output producing a pass voltage. The converting circuit converts the pass voltage into a first current and a second current passing through a first converting node and a second converting node respectively, where the first current charges/discharges the capacitive device. The first current mirror module has a first current mirror path coupled to the first converting node and a second current mirror path coupled to the second converting node. The second current mirror module has a first current mirror path coupled to the second converting node and a second current mirror path coupled to the first output. | 10-30-2008 |
20080265854 | Low Drop Out Voltage Regulator Circuit Assembly - An integrated circuit assembly includes a voltage level generator, a level shifter, a bandgap reference generator and a voltage regulator. The voltage level generator generates output voltage level signals in response to a supply voltage. The level shifter receives the output voltage level signals from the voltage level generator and generates first and second sets of control signals. The bandgap reference generator receives a reference voltage input and generates a bandgap reference signal. The voltage regulator receives a supply voltage, the bandgap reference signal the first and second sets of control signals from the level shifter and generates a constant output voltage under varying circuit conditions. | 10-30-2008 |
20080265855 | Power regulator circuitry for programmable logic device memory elements - Power regulator circuitry for programmable memory elements on programmable logic device integrated circuits is provided. The programmable memory elements may each include a storage element formed from cross-coupled inverters and an address transistor. Address drivers may be used to supply address signals to the address transistors. The power regulator circuitry may include an address power supply circuit that produces a time-varying address power supply voltage to the address drivers and storage element power supply circuits that provide time-varying storage element power supply voltages to the cross-coupled inverters in the storage elements. Unity gain buffers may be used to distribute a reference voltage from a bandgap voltage reference to the power supply circuits. The power supply circuits may use voltage dividers and p-channel metal-oxide-semiconductor control transistors. | 10-30-2008 |
20080265856 | CONSTANT-VOLTAGE POWER CIRCUIT - A differential amplifier receives a reference voltage and a divided voltage dividing an output voltage, and outputs a control voltage in accordance with the difference between the reference voltage and the divided voltage. The control voltage output from the differential amplifier is supplied to an output amplifier. The output amplifier generates a stabilized output voltage from a high-potential-side power supply voltage in accordance with the control voltage. A P-type MOS transistor is connected to a node of the output voltage, and the MOS transistor carries a current from the node of the output voltage. A current control circuit controls a gate of the P-type MOS transistor so that the current flowing through the P-type MOS transistor becomes a constant value. | 10-30-2008 |
20080272754 | CONSTANT VOLTAGE POWER SUPPLY CIRCUIT AND METHOD OF CONTROLLING THE SAME - A constant-voltage power supply circuit is disclosed that is able to prevent overshoot of an output voltage possibly occurring when changing a constant-voltage circuit in operation and is able to supply a constant output voltage. The constant-voltage power supply circuit includes a first constant-voltage circuit, having a first output transistor and a first output voltage controller, that generates a first reference voltage and generates a first proportional voltage in proportion to a voltage on an output terminal, and a second constant-voltage circuit having a second output transistor and a second output voltage controller that generates a second reference voltage and generates a second proportional voltage in proportion to the voltage on the output terminal. When the first output voltage controller or the second output voltage controller starts operations according to a control signal input from the outside, a rising edge of the first reference voltage or the second reference voltage is delayed so as to be later than a rising edge of the first proportional voltage or the second proportional voltage. | 11-06-2008 |
20080284393 | Reduced Noise Low Drop Output Arrangement - Implementations related to low drop output (LDO) circuit arrangements are presented herein. | 11-20-2008 |
20080303498 | Current Generator - A current generator is provided, including a bandgap circuit, an operational amplifier, and an output resistor. The bandgap circuit is used to output a bandgap reference voltage insensitive to environment temperature and supply voltages. The operational amplifier has a positive input receiving the bandgap reference voltage, a negative input, and an output connected to the negative input to obtain an output voltage substantially equal to the bandgap reference voltage. The output resistor is connected to the output of the operational amplifier serially to generate an output current flowing through the output resistor. Thus, the output current generated by the current generator is insensitive to environment temperature and supply voltages, and therefore more accurate and stable. | 12-11-2008 |
20090001952 | Apparatus and method for improving a transient response of a power converter - The output current of a power converter is sensed for triggering a quick transient response when the variation of the output current reaches a default value, and therefore the output voltage of the power converter is promptly stabilized earlier by removing the time delay to trigger the quick transient response. | 01-01-2009 |
20090009147 | LOW DROP-OUT VOLTAGE REGULATOR WITH HIGH-PERFORMANCE LINEAR AND LOAD REGULATION - A low drop-out voltage regulator with high-performance linear and load regulation, comprising: a reference voltage circuit, capable of providing a reference voltage; a differential amplifier; a power device, capable of driving a load resistor; a feedback circuit, disposed between the differential amplifier and the power device so that the differential amplifier outputs a correction voltage after the reference voltage and a feedback voltage across the feedback circuit; and a voltage buffer for frequency compensation, disposed between the differential amplifier and the power device, the voltage buffer comprising a complementary type buffer. | 01-08-2009 |
20090015222 | Constant voltage circuit capable of quickly responding to a sudden change of load current - A constant voltage circuit which is capable of quickly responding to a sudden change of an output voltage includes an output transistor, and first and second error amplifiers. The output transistor outputs a power with an output voltage and an output current to a load. The first error amplifier is configured to increase a response speed with respect to changes of the output voltage in accordance with an increase of the output current so as to control operations of the output transistor. The second error amplifier has a response speed faster than the first error amplifier with respect to changes of the output voltage, and is configured to decrease a gain thereof in response to a drain current of the output transistor. | 01-15-2009 |
20090021229 | Method and Apparatus for Enabling a Voltage Regulator - A voltage regulator circuit is operated by enabling a bias network operable to set a bias current in an amplifier. A startup circuit is connected to the bias network, the startup circuit operable to assist the bias network in setting the amplifier bias current during a startup period. The startup circuit is disconnected from the bias network responsive to the startup period lapsing while the voltage regulator circuit is enabled for resetting the startup circuit to an initial state. The bias network may be disabled to reduce the amplifier bias current. Subsequent re-enablement of the bias network is prevented until the amplifier is reliably disabled. | 01-22-2009 |
20090027017 | Circuit arrangement for the regulation of a current through a load - A circuit arrangement ( | 01-29-2009 |
20090039847 | Output impedance compensation for linear voltage regulators - In a method and system for regulating an output voltage, a linear voltage regulator (LVR) includes an adjustable shunt regulator (ASR) having a limited gain, a feedback circuit (FC), and a compensation resistor (CR). The limited gain causes the output voltage of the ASR to change in response to a change in an input current of the ASR. The FC generates a feedback voltage reference in proportion to the output voltage, the feedback voltage reference being provided to the ASR to control the output voltage. The CR is coupled to the ASR and the FC. The input current flows through the CR to provide a compensating voltage across the CR. The compensating voltage is provided to the feedback circuit to compensate the limited gain, thereby providing the output voltage that is substantially independent of the input current. | 02-12-2009 |
20090039848 | SYSTEMS AND METHODS FOR ON-CHIP POWER MANAGEMENT - A power measurement system is disclosed for use on an integrated circuit for measuring the power used by the integrated circuit. The power measurement system includes a low-dropout voltage regulator and a signal input unit. The low-dropout voltage regulator includes a power transistor that couples a supply voltage to a circuit to be powered by the supply voltage, and the low-dropout voltage regulator provides an internal adjustment signal (V | 02-12-2009 |
20090072804 | TRIMMING CIRCUIT - A trimming circuit which comprises a shunt circuit having two shunt resistors and two shunt ON/OFF switches and connected in parallel with a series resistor circuit. The middle point of the shunt circuit is connected to a connection point of the series resistor circuit, the resistance ratio thereof with respect to the connection point being equal to the resistance ratio of the shunt resistors. | 03-19-2009 |
20090079406 | High-voltage tolerant low-dropout dual-path voltage regulator with optimized regulator resistance and supply rejection - A voltage regulator includes an amplifier having first and second outputs, a feedback path coupled between a first input and the first output of the amplifier, and a feed-forward path between the second output of the amplifier and a switch coupled to a reference potential. In operation, a first control signal from the second output of the amplifier is generated based on a comparison of a reference signal and a feedback signal into the first input of the amplifier. The first control signal controls the switch to maintain a substantially constant supply voltage. A second control signal is generated along the feedback path to control controls the amount of supply voltage. | 03-26-2009 |
20090079407 | SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE - The present invention provides a regulator circuit that can fast-respond to a variation in load current and supply a sufficient drive current so as to be capable of generating a stable internal source voltage. The regulator circuit includes a preamplifier circuit that detects and amplifies a different between a reference voltage and an internal source voltage, a clamp circuit that limits the amplitude of an output of the preamplifier circuit, a main amplifier circuit that amplifies the amplitude-limited output of the preamplifier circuit, and a driver circuit that outputs the internal source voltage according to the output of the main amplifier. Even though the internal source voltage varies abruptly, the regulator circuit does not oscillate owing to the effect of the clamp circuit. | 03-26-2009 |
20090115383 | System And Method For Controlling Mode Crossover Time In A Power Supply - A system for controlling mode crossover time in a power supply includes a power output element having a constant voltage control loop and a constant current control loop, the constant voltage control loop having a first error amplifier and the constant current control loop having a second error amplifier. An additional error amplifier is operatively coupled to a compensation capacitance associated with the second error amplifier, the additional error amplifier configured to cause the constant current control loop to provide an additional current to flow from the constant current control loop, thus causing the power output element to transition from a constant voltage mode to a constant current mode responsive to a programmed voltage value. | 05-07-2009 |
20090115384 | Distributed Power Management - Apparatuses, methods, and systems for effective power management distribution are provided. In an embodiment, a system for providing power to a circuit block comprises a power management unit (PMU) configured on a first substrate and an integrated circuit (IC) configured on a second substrate. The PMU includes a first regulator configured to step down an input voltage and output a first regulated voltage. The IC includes the circuit block and a second regulator configured to receive the first regulated voltage and output a second regulated voltage. The second power regulated voltage provides power to the circuit block. The first regulator is more efficient than the second regulator. | 05-07-2009 |
20090128107 | Low Dropout Voltage Regulator - Improved designs of an LDO voltage regulator with ultra low quiescent current are disclosed. According to one embodiment, an LDO voltage regulator is designed to completely cancel an intermediate gain stage while decreasing a quiescent current and to stabilize a loop circuit by means of two zeros introduced in a frequency transfer function thereof. Such a LDO voltage regulator does not increase the power consumption and applicable in many circuits used in electronic devices. | 05-21-2009 |
20090153112 | LINEAR STEP-DOWN VOLTAGE REGULATOR - A linear step-down voltage regulator is provided. The linear step-down voltage regulator is grounded with a ground terminal. The ground terminal is electrically connected to a digital ground terminal of a switching circuit. The linear step-down voltage regulator includes a pass element, a voltage dividing resistor, an error amplifier, a metal oxide semiconductor (MOS) transistor, and a low-pass filter. The employment of the low-pass filter effectively adjusts and restricts the switching noise to pass therethrough, so as to decrease the output of the switching noise and thus eliminating the problems due to the noise. | 06-18-2009 |
20090184697 | SYSTEM, APPARATUS, AND METHOD FOR SELECTABLE VOLTAGE REGULATION - Apparatuses, systems, and methods are disclosed for generating, regulating, and modifying various voltage levels on a semiconductor device using a current mirroring digital-to-analog voltage regulator. The voltage regulator operates by mirroring a reference current onto a selectable current level and controlling the selectable current level with a digital input to a plurality of switched CMOS devices connected in parallel. The switched CMOS devices generate the selectable current level responsive to the digital input and proportional to the reference current. The selectable current level is combined with an output of a voltage divider to generate a monitor signal. The monitor signal is compared to a reference voltage and the results of the comparison controls a charge pump to generate a pumped voltage. The pumped voltage is fed back to the voltage divider, which includes a feedback resistor and a reference resistor connected in series between the pumped voltage and ground. | 07-23-2009 |
20090200999 | VOLTAGE REGULATOR WITH COMPENSATION AND THE METHOD THEREOF - A voltage regulator including a transconductance amplifying unit, a transresistance amplifying unit, a feedback unit, a differential amplifying unit, and a compensation capacitor. The transconductance amplifying unit includes two inputs for receiving a feedback voltage and a reference voltage, and includes an output for outputting a current. The transresistance amplifying unit includes an input for receiving the current, and transforming the current into an output voltage. The feedback unit generates the feedback voltage with reference to the output voltage. The differential amplifying unit includes two inputs for receiving the feedback voltage and the reference voltage, and includes an output for outputting a differential voltage. The compensation capacitor is coupled between the output of the differential amplifying unit and the input of the transresistance amplifying unit. | 08-13-2009 |
20090243571 | Built-In Self-Calibration (BISC) Technique for Regulation Circuits Used in Non-Volatile Memory - A reference voltage regulation circuit ( | 10-01-2009 |
20100013448 | SYSTEM INCLUDING AN OFFSET VOLTAGE ADJUSTED TO COMPENSATE FOR VARIATIONS IN A TRANSISTOR - A system including a first transistor, a first capacitor and a circuit. The first transistor has a first control input and is configured to regulate an output voltage. The first capacitor is coupled at one end to the first control input and at another end to a circuit reference. The circuit is configured to provide a first voltage to the first control input, where the first voltage includes an offset voltage that is referenced to the output voltage and adjusted to compensate for variations in the first transistor. | 01-21-2010 |
20100033144 | VOLTAGE REGULATORS - Voltage regulators are provided. In one embodiment of the voltage regulators, a differential amplifier receives a reference voltage and a feedback voltage, to generate a control signal according to a voltage difference between the feedback voltage and the reference voltage. An output transistor has a first terminal coupled to a power voltage, a control terminal coupled to the differential amplifier for receiving the control signal, and a second terminal coupled to an output terminal. A voltage feedback circuit is coupled between the output terminal and a ground voltage to generate the feedback voltage. A discharge transistor has a first terminal coupled to the ground voltage, a control terminal coupled to a first control signal, and a second terminal coupled to the output terminal through a first resistor in the voltage feedback circuit. | 02-11-2010 |
20100052634 | DRIVING CIRCUIT FOR IMPROVING THE LOADING TRANSIENT PERFORMANCE OF A POWER CONVERTER - A driving circuit that improves the loading transient performance of a power converter is provided. The driving circuit comprises an input unit, an output unit, a reference current generating unit, and a discharging unit. The input unit receives a first voltage signal and a second voltage signal. The first voltage signal has a first voltage V | 03-04-2010 |
20100052635 | Compensation of LDO regulator using parallel signal path with fractional frequency response - A low drop out (LDO) voltage regulator ( | 03-04-2010 |
20100060248 | Soft-start voltage circuit - A soft-start voltage circuit includes an operational amplifier, a first and a second capacitors, a first and a second switches, and a voltage level shifter. The operational amplifier includes a positive end, a negative end, and an output end coupled to the negative end of the operational amplifier for outputting the soft-start voltage. The voltage level shifter is coupled between the first capacitor and the positive end of the operational amplifier for shifting a level of the voltage on the first capacitor. The first switch is coupled between the first and the second capacitors for coupling the first and the second capacitors according to the clock. The second switch is coupled between the second capacitor and the negative end of the operational amplifier for coupling the second capacitor and the negative end of the operational amplifier according to the inverted clock. | 03-11-2010 |
20100060249 | CURRENT-RESTRICTION CIRCUIT AND DRIVING METHOD THEREFOR - A current-restriction circuit includes an input terminal to which an input voltage is input, an output terminal from which an output voltage is output, a driver transistor connected to the input terminal as well as the output terminal, a sense transistor connected to the output terminal as well as the input terminal via a sense resistor, a first operational amplifier circuit, and a bias-voltage change circuit. Control terminals of the driver transistor and the sense transistor are connected together and connected to an output terminal of the first operational amplifier circuit. The first operational amplifier circuit receives both a bias voltage with reference to an electrical potential at the input terminal and a decrease in a voltage at the sense resistor. The bias-voltage change circuit keeps the bias voltage below a predetermined bias voltage according to a voltage difference between the input voltage and the output voltage. | 03-11-2010 |
20100109624 | Low Drop Out (LDO) Bypass Voltage Regulator - A power element bypass and voltage regulation circuit shutdown is used in a low drop out (LDO) bypass voltage regulator to minimize current drawn by the voltage regulator circuit when the supply input voltage approaches the regulated output voltage of the voltage regulation circuit. Two modes of operation are used in the low drop out (LDO) bypass voltage regulator. A regulate mode is used when the supply input voltage is greater than the reference voltage input, and a track mode is used when the supply input voltage is less than or equal to approximately the regulated output voltage of the voltage regulation circuit. Hysteresis may be introduced when switching between the regulate and track modes of operation. | 05-06-2010 |
20100141223 | LOW DROP-OUT VOLTAGE REGULATOR WITH WIDE BANDWIDTH POWER SUPPLY REJECTION RATIO - A low drop-out (LDO) voltage regulator with a wide bandwidth power supply rejection ratio (PSRR) is described. In one aspect, the LDO voltage regulator includes two individual voltage regulator circuit stages. A first stage voltage regulator circuit output is at an intermediate voltage (VINT) between an input supply voltage (VDD) and a final regulated output voltage (VREG). A second stage voltage regulator circuit output is at the final regulated output voltage (VREG) and is optimized for noise-sensitive analog circuits across a wide operating bandwidth. The first stage voltage regulator circuit has a zero frequency while the second stage voltage regulator circuit has a matching pole frequency to minimize the AC response from VDD to VREG across all frequencies. | 06-10-2010 |
20100148735 | ENHANCED EFFICIENCY LOW-DROPOUT LINEAR REGULATOR AND CORRESPONDING METHOD - A low-dropout linear regulator includes an error amplifier which includes a cascaded arrangement of a differential amplifier and a gain stage. The gain stage includes a transistor driven by the differential amplifier to produce at a drive signal for an output stage of the regulator. The transistor is interposed over its source-drain line between a first resistive load included in a RC network creating a zero in the open loop gain of the regulator, and a second resistive load to produce a drive signal for the output stage of the regulator. The second resistive load is a non-linear compensation element to render current consumption linearly proportional to the load current to the regulator. The first resistive load is a non-linear element causing the frequency of said zero created by the RC network to decrease as the load current of the regulator decreases. | 06-17-2010 |
20100148736 | LOW-DROPOUT LINEAR REGULATOR AND CORRESPONDING METHOD - A low-dropout linear regulator includes an error amplifier comprising a cascaded arrangement of a differential amplifier and a gain stage having interposed therebetween a frequency compensation network for a loading current to flow therethrough. The regulator includes a current limiter inserted the flow-path of the loading current for the compensation network to increase the slew rate of the output of the differential amplifier by dispensing with the capacitive load in the frequency compensation network during load transients in the regulator. | 06-17-2010 |
20100156364 | LOW-DROPOUT VOLTAGE REGULATOR AND OPERATING METHOD OF THE SAME - A low-dropout (LDO) voltage regulator that includes an error amplifier which compares a reference voltage with a feedback voltage of an output voltage and outputs an error signal based on the result of the comparison, the error amplifier being biased by an input voltage; a first MOS transistor having a gate electrically connected to the error signal, a source electrically connected to the input voltage and a drain electrically connected to the output voltage; a voltage divider which transmits a predetermined part of the output voltage to the error amplifier as feedback voltage; and a level limiter which limits a level of the output voltage from changing beyond and below an offset voltage when a level of a load current changes. In accordance with embodiments, A predetermined number of comparators and MOS transistor type-switches are provided to enhance the slew ratio of the regulated output voltage and to reduce standby electricity consumption. | 06-24-2010 |
20100156365 | START-UP CIRCUIT AND METHOD FOR HIGH VOLTAGE POWER DISTRIBUTION CIRCUIT - A start-up circuit for a high voltage power distribution circuit includes a transistor, a current source which generates ramped current, an operational amplifier which is connected between the current source and the transistor and controls the transistor, a capacitor which is fed the generated ramped current from the current source and is charged by the generated ramped current, the capacitor being connected to the non-inverting input of the operational amplifier, and a feedback capacitor connected from the transistor output to the non-inverting input of the operational amplifier, which is fed the generated ramped current from the capacitor and is discharged. The transistor is fully enabled when the feedback capacitor is fully discharged. | 06-24-2010 |
20100181973 | Voltage Converter with Connected Capacitors and Device for the Compensation of the Capacitors Voltages - A voltage converter comprises a first, a second and a third capacitor ( | 07-22-2010 |
20100201332 | VOLTAGE REGULATOR CIRCUITRY WITH ADAPTIVE COMPENSATION - Voltage regulator circuitry is provided. The voltage regulator circuitry may contain a drive transistor that is controlled by the output of an operational amplifier. The drive transistor may supply a regulated voltage to a load. The operational amplifier may compare a reference voltage and a feedback signal at its inputs. The operational amplifier may include first and second stages. An adjustable resistor may be provided between the first and second stages. Control circuitry may control the resistance of the adjustable resistor based on the amount of current flowing through the load to ensure stable operation of the voltage regulator circuitry. Overshoot and undershoot detection and compensation circuitry may compensate for overshoot and undershoot in the regulated voltage. Voltage ramp control circuitry may be used to control the ramp rate of the regulated voltage. | 08-12-2010 |
20100289464 | POWER SUPPLY CIRCUIT - A power supply circuit comprises a power transistor, differential amplifier, an I/V converter circuit, and an inverting amplifier, wherein the differential amplifier comprises a first current path in which a first resistor element, a first current mirror transistor, and a first control transistor are connected in series, and a second current path in which a second resistor element, a second current mirror transistor, and a second control transistor are connected in series, and the power supply circuit comprises a phase compensating capacitor element connected in parallel with the inverting amplifier, and a ripple removal rate improving capacitor element which is connected between ground and a connection point between the first resistor element and the first current mirror transistor, or between the ground and a connection point between the second resistor element and the second current mirror transistor. | 11-18-2010 |
20110018509 | Driver, Current Regulating Circuit Thereof, and Method of Current Regulation - A current regulating circuit includes a transistor and an operational amplifier. The transistor receives a load current and generates a feedback voltage corresponding to the load current. The operational amplifier receives a reference voltage and the feedback voltage to control the transistor. The operational amplifier further includes an input stage and an output stage. The input stage includes amplifier inputs each for alternately receiving the reference voltage and the feedback voltage so that the input stage generates operating voltages corresponding to the reference voltage and the feedback voltage. The output stage receives the operating voltages alternately to control the transistor. A driver and a method of current regulation are also disclosed herein. | 01-27-2011 |
20110018510 | ADAPTIVE MILLER COMPENSATED VOLTAGE REGULATOR - A linear voltage regulator includes a Miller frequency compensation having a movable zero, which tracks the frequency of the load pole as the load condition changes. The compensated voltage regulator maintains stability under variable load conditions. Because of the Miller effect, DC open-loop gain and bandwidth are not sacrificed for stability. The compensated voltage regulator can therefore maintain high power supply rejection ratio (PSRR). | 01-27-2011 |
20110068758 | REGULATED CIRCUITS AND OPERATIONAL AMPLIFIER CIRCUITS - Circuits providing a regulated voltage. An output stage has a power switch with a control node, a power input node and a power output node. The power input node is coupled to a source voltage and the power output node provides the regulated voltage. An amplifier stage compares a feedback voltage with a reference voltage, having first and second output nodes. The feedback voltage is about in proportion to the regulated voltage. A buffer stage has an input node connected to the first output node. The output node of the buffer stage and the second output node of the amplifier stage together drive the control node of the output stage. | 03-24-2011 |
20110089916 | LDO REGULATORS FOR INTEGRATED APPLICATIONS - Embodiments of the invention are related to LDO regulators. In an embodiment, an amplifier drives the gate of a master source follower and of at least one slave source follower to form an LDO regulator. In an alternative embodiment, a charge pump drives the master source follower to form the regulator. Additional slave source followers may be used in conjunction with the charge pump and the master source follower to improve the regulator performance. Other embodiments are also disclosed. | 04-21-2011 |
20110101936 | LOW DROPOUT VOLTAGE REGULATOR AND METHOD OF STABILISING A LINEAR REGULATOR - A low dropout (LDO) voltage regulator comprises a regulating element ( | 05-05-2011 |
20110133710 | Partial Feedback Mechanism in Voltage Regulators to Reduce Output Noise Coupling and DC Voltage Shift at Output - Techniques are presented for reducing the DC voltage shift in a voltage regulator, particularly for high and ultra-high speed load switching operation. The regulator includes a power transistor, connected between an input supply voltage and an output node, and an error amplifier, having its output connected to control the gate of the output transistor, a first input connected to receive a reference voltage, and a second input connected to a feedback node. The regulator also includes a first resistance, connected between the feedback node and ground, and also a second resistance, a third resistance, and a first capacitance, where the feedback node is connected to the output node through a combination of the first capacitance in parallel with the second resistance and in series with the third resistance. Consequently, the feedback path from the output node of the regulator uses a partial feedback mechanism, where the capacitance is included to generate a zero in the feedback divider path, but a resistance is placed in series with the capacitance so that at high frequencies the feedback level is still separated from the output level. | 06-09-2011 |
20110140677 | POWER SUPPLY CIRCUIT FOR SOUTH BRIDGE CHIP - A power supply circuit for south bridge chip includes a voltage conversion chip, a control circuit, and a voltage increasing circuit coupled electrically to the voltage conversion chip and the control circuit. The voltage conversion chip is configured for ouputting a driving signal. The control circuit is configured for receiving the driving signal and a first voltage, and converting the first voltage to a second voltage according to the driving signal. The voltage increasing circuit is configured for increasing voltage level of the second voltage, wherein the second voltage is supplied to the south bridge chip via the voltage increasing circuit. | 06-16-2011 |
20110156671 | FAST LOAD TRANSIENT RESPONSE CIRCUIT FOR AN LDO REGULATOR - A fast load transient response circuit includes a feedback loop that senses a load transient; a first driver and a second driver responsive to a feedback signal from the feedback loop; and a first pass transistor and a second pass transistor with sources and drains being coupled to each other, and a gate of the first pass transistor being driven by the first driver and a gate of the second pass transistor being driven by the second driver. A width of the channel to length of the channel (W/L) ratio of the first pass transistor is different than that of the second pass transistor such that second pass transistor reacts faster than the first pass transistors to a load transient. | 06-30-2011 |
20110156672 | STARTUP CIRCUIT FOR AN LDO - A startup circuit in an LDO includes an operational amplifier having an inverting terminal and a non-inverting terminal and an output node. The non-inverting terminal receives a reference voltage. The startup circuit further includes a feedback capacitor coupled between an output node and the inverting terminal and a current source coupled between the inverting terminal and ground such that the current source and the feedback capacitor together control rate of change of an output voltage of the operational amplifier. A comparator is used to stop the rate of change of output voltage after the output voltage reaches a desired value. | 06-30-2011 |
20110156673 | INTERNAL POWER GENERATING CIRCUIT AND SEMICONDUCTOR DEVICE INCLUDING THE SAME - A semiconductor device includes an enable unit configured to enable an output terminal, a feedback unit configured to receive an output of the output terminal and output a feedback signal, an amplifying unit configured to amplify a difference between a reference signal and the feedback signal, and a transfer unit configured to transfer an amplified signal of the amplifying unit as an enable control signal of the enable unit, and to have an output resistance value smaller than an output resistance value of the amplifying unit. | 06-30-2011 |
20110169465 | VOLTAGE REGULATOR - Provided is a voltage regulator having low current consumption, which is capable of preventing a reverse current from flowing thereto from an output terminal ( | 07-14-2011 |
20110175583 | High voltage regulated power supply - A regulated power supply circuit includes a voltage reference circuit arranged to generate a reference voltage and an output device responsive to a control signal to supply a load from a voltage source. A control circuit is arranged to compare an output voltage at the load with the reference voltage. The control circuit includes a comparator comprising a long-tailed transistor pair having a first input to which the reference voltage is applied, a second input to which the output voltage is applied, and an output connected to an input terminal of the output device. The control circuit applies a correction signal to the output device via a single semiconductor junction to regulate the output voltage, thereby minimising propagation delay in the control circuit. The circuit may include a primary voltage regulator arranged to supply the control circuit at a lower voltage than that of the voltage source. | 07-21-2011 |
20110181257 | Controlled Load Regulation and Improved Response Time of LDO with Adapative Current Distribution Mechanism - A low drop-out (LDO) voltage regulation circuit includes first and second internal current paths. The first internal current path is between the input supply voltage and ground and includes the regulator's buffer circuit. The second internal current path is between the input supply voltage and ground and includes the regulator's power transistor. The amount of current flowing through the first internal current path relative to the amount of current flowing through the second internal current path is an increasing function of a current supplied to a load connected to the output supply node. The load regulation of the LDO is improved as the DC gain will not go down at lower load currents. Further, the no load to full load response time is improved as the load pole and power MOS gate pole are actively controlled with respect to output load current. In this mechanism, as the amount of current being supplied to the load decreases, the internal current flow shifts from the first internal current path to the second internal current path and vice versa. This arrangement maintains the desired pole structure and keeps the quiescent current largely the same for all load current levels. | 07-28-2011 |
20110248693 | VOLTAGE REGULATOR WITH CONTROL LOOP FOR AVOIDING HARD SATURATION - Embodiments of circuits, apparatuses, and systems for a voltage regulator with a control loop for avoiding hard saturation are disclosed. Other embodiments may be described and claimed. | 10-13-2011 |
20110267017 | On-Chip Low Voltage Capacitor-Less Low Dropout Regulator with Q-Control - Systems and method for a capacitor-less Low Dropout (LDO) voltage regulator. An error amplifier is configured to amplify a differential between a reference voltage and a regulated LDO voltage. Without including an external capacitor in the LDO voltage regulator, a Miller amplifier is coupled to an output of the error amplifier, wherein the Miller amplifier is configured to amplify a Miller capacitance formed at an input node of the Miller amplifier. A capacitor coupled to the output of the error amplifier creates a positive feedback loop for decreasing a quality factor (Q), such that system stability is improved. | 11-03-2011 |
20120001605 | DIFFERENTIAL AMPLIFIER CIRCUIT AND SERIES REGULATOR - A differential amplifier circuit including: a differential input stage including a pair of differential MOS transistors, a pair of load elements, and a first constant-current source; an output stage including an output MOS transistor and a second constant-current source; a constant-current MOS transistor provided in parallel to one of the first and second constant-current sources; and a boost current controlling MOS transistor in which a potential of a connection node of the output MOS transistor and the second constant-current source is applied to a gate terminal thereof; wherein the boost current controlling MOS transistor is turned on when a voltage inputted to a gate terminal of one of the pair of differential MOS transistors changes, and a current of the constant-current MOS transistor is added to one of the first and second constant-current sources and is allowed to flow. | 01-05-2012 |
20120013317 | CONSTANT VOLTAGE REGULATOR - A voltage regulator includes a driver transistor, a feedback voltage generator, a reference voltage generator, a first differential amplifier, and a differential gain controller. The driver transistor is connected between input and output terminals to conduct a current therethrough according to a control signal applied to a gate terminal thereof. The feedback voltage generator is connected to the output terminal to generate a feedback voltage. The reference voltage generator generates a reference voltage. The first differential amplifier has an output thereof connected to the gate terminal of the driver transistor, and a pair of differential inputs thereof connected to the feedback voltage generator and the reference voltage generator, respectively, to generate the control signal at the output thereof. The differential gain controller is connected to the output of the first differential amplifier to control the differential gain according to a difference between the input and output voltages. | 01-19-2012 |
20120086419 | Power Supply Device, A Processing Chip for a Digital Microphone and related Digital Microphone - A power supply device, a processing chip for a digital microphone and related digital microphone are described herein. In one aspect, a power supply device includes: at least two cascaded low-dropout linear regulators. In another aspect, a processing chip for digital microphone includes a processing module and a power supply module, wherein the power supply modules includes at least two cascaded low dropout linear regulators. In another aspect, a digital microphone includes a microphone and a processing chip, wherein the processing chip includes a processing module and a power supply module, wherein the power module includes at least two cascaded low-dropout linear regulators. Embodiments described herein provide a power supply device with higher PSRR. | 04-12-2012 |
20120181998 | ENHANCED EFFICIENCY LOW-DROPOUT LINEAR REGULATOR AND CORRESPONDING METHOD - A low-dropout linear regulator includes an error amplifier which includes a cascaded arrangement of a differential amplifier and a gain stage. The gain stage includes a transistor driven by the differential amplifier to produce at a drive signal for an output stage of the regulator. The transistor is interposed over its source-drain line between a first resistive load included in a RC network creating a zero in the open loop gain of the regulator, and a second resistive load to produce a drive signal for the output stage of the regulator. The second resistive load is a non-linear compensation element to render current consumption linearly proportional to the load current to the regulator. The first resistive load is a non-linear element causing the frequency of said zero created by the RC network to decrease as the load current of the regulator decreases. | 07-19-2012 |
20120212199 | Low Drop Out Voltage Regulator - A low dropout voltage regulator (LDO) is presented that takes into consideration short channel effects of the pass transistor in suppressing ripples that are present at the input node of the LDO from appearing at the output node of the LDO. A sum of the input ripple voltage and the input ripple voltage multiplied by a gain equal to the reciprocal of the intrinsic gain provided by the pass transistor is fed to the gate of the pass transistor. In one embodiment an adaptive stage is utilized to provide the sum to the gate of the pass transistor. The adaptive stage gain adapts to change changing load currents such that the gate voltage is maintained substantially equal to the sum. In another embodiment, the LDO is provided stability by using only on-chip capacitors. The LDO provides stable operation even at small load currents. | 08-23-2012 |
20120223688 | HIGH POWER SUPPLY REJECTION RATIO (PSRR) AND LOW DROPOUT REGULATOR - A low dropout voltage regulator (LDO) includes first and second amplifiers and a current mirror. The first amplifier includes a first input receiving a reference voltage and a second input receiving a voltage proportional to an output of the LDO. The current mirror includes an input current at a first end of the current mirror to an output current at a second end of the current mirror, the input current controlled by an output of the first amplifier and the output current being supplied to the output of the LDO. The second amplifier includes a first input coupled to the first end of the current mirror and a second input coupled to the second end of the current mirror. | 09-06-2012 |
20120313597 | Wide-Bandwidth Linear Regulator - A linear regulator and a method of regulating a supply voltage are provided. Embodiments include a linear regulator with a first feedback loop and a second feedback loop. The first feedback loop is characterized by a first bandwidth and a first gain. The first feedback loop includes a first amplifier characterized by an output impedance which is significantly reduced in order to maximize the bandwidth of the first feedback loop when driving the capacitance of a control input of a series pass element. The second feedback loop is characterized by a second bandwidth and a second gain. The second feedback loop includes a second amplifier that controls the current in the first amplifier in the first feedback loop. | 12-13-2012 |
20130027010 | Voltage Regulator - A voltage regulator includes a current bridge and first and second current paths coupling a current mirror to respective first and second voltage-to-current converters. The current mirror controls a second current dependent on a first current. The first voltage-to-current converter controls the first current dependent on either a reference voltage or a feedback voltage derived from the regulator's output voltage, and the second voltage-to-current converter controls the second current dependent on the other of the feedback and reference voltages. Voltage-to-current conversion by the first converter is independent of voltage-to-current conversion by the second converter. An output transistor stage coupled to the second current path controls the output voltage dependent on the voltage in the second current path indicative of a deviation of the second current from a target current value dependent on the reference voltage. | 01-31-2013 |
20130033244 | Low Dropout Linear Regulator - Various embodiments of the present invention provide apparatuses and methods for regulating an output voltage. For example, an apparatus is discussed that includes a low dropout regulator having a pass transistor and an amplifier and being operable to regulate the output voltage based on a feedback signal and a feedforward signal. The apparatus also includes an auxiliary low dropout regulator having an auxiliary pass transistor and an auxiliary amplifier. The auxiliary dropout regulator is operable to generate the feedforward signal and is substantially matched with the amplifier. | 02-07-2013 |
20130063110 | FAST STARTUP ALGORITHM FOR LOW NOISE POWER MANAGEMENT - A method is provided. A low dropout regulator (LDO) is disabled during a first mode, and a first reference voltage is selected and applied to a switched-mode converter during the first mode. Also during the first mode, a first output voltage is generated by the switched-mode converter from a power supply, and a first capacitor is overcharged with the first output voltage. The LDO is then enabled during a second mode. During a first portion of a startup period for the second mode, a second capacitor is charged from the first capacitor, and a second reference voltage is selected and applied to the switched-mode converter. Then, during a second portion of the startup period for the second mode, the second capacitor is charged with the switched-mode converter. | 03-14-2013 |
20130063111 | POWER MANAGEMENT SYSTEM AND METHOD WITH ADAPTIVE NOISE CONTROL - A method is provided. A first reference voltage during an idle mode is selected, and the first reference voltage is applied to a switched-mode converter. A first output voltage is then generated by the switched-mode converter from a power supply, and a capacitor is overcharged with the first output voltage. The first output voltage is regulated to generate a second output voltage during the idle mode. Then, a second reference voltage during a quiet mode, where the second reference voltage to the buck converter. During the quiet mode, a third output voltage is generated from the switched-mode converter and from discharging the overcharged capacitor, and the third output voltage is regulated to generate the second output voltage. | 03-14-2013 |
20130076325 | VOLTAGE REGULATOR - A voltage regulator includes a pass transistor, an operational amplifier and a voltage divider circuit. The pass transistor receives a supply voltage to generate a regulated output voltage according to a control signal. The operational amplifier generates the control signal according to a feedback voltage. The voltage divider circuit generates the feedback voltage at a feedback node according to the regulated output voltage, and includes a string of resistors and a stabilization element. The string of resistors is coupled to the pass transistor and includes multiple resistors. The stabilization element is coupled to the resistors and receives the regulated output voltage. | 03-28-2013 |
20130082672 | CAPACITOR-FREE LOW DROP-OUT REGULATOR - There is provided a low drop-out regulator. The low drop-out regulator includes an amplifier including an odd number of operational amplifiers connected to one another in series, and an output unit including a pass transistor operated by an output from the amplifier and generating an output voltage to be applied to a load, wherein the pass transistor is an N-channel transistor, and the amplifier controls a feedback loop gain between an output terminal of one of the odd number of operational amplifiers and the output unit. The feedback loop gain may be controlled independently from the trans-conductance of the pass transistor, whereby the stable output voltage may be generated, even in the case that the load and the input voltage are changed, and the design parameter may be simplified. | 04-04-2013 |
20130113447 | LOW DROPOUT VOLTAGE REGULATOR INCLUDING A BIAS CONTROL CIRCUIT - A low dropout (LDO) regulator includes a voltage regulation loop for providing an output voltage to an output terminal, where the output voltage is proportional to a reference voltage. The voltage regulation loop includes a current bias input for receiving a bias current. The LDO regulator also includes a bias current control circuit for providing the bias current at a first value when the reference voltage is greater than a feedback voltage and at a second value higher than the first value when the reference voltage is less than the feedback voltage. | 05-09-2013 |
20130119954 | ADAPTIVE TRANSIENT LOAD SWITCHING FOR A LOW-DROPOUT REGULATOR - A low-dropout (LDO) voltage regulator includes a switch to generate an output current, and a first sensing module that increases the speed at which the switch is turned off and the output current is decreased in response to detecting a decreasing load current. The LDO regulator further includes a second sensing module that increases the speed at which the switch is turned on and the output current is increased in response to detecting an increasing load current. | 05-16-2013 |
20130134952 | PHASE COMPENSATION CIRCUIT, SEMICONDUCTOR INTEGRATED CIRCUIT HAVING PHASE COMPENSATION CIRCUIT, AND POWER SUPPLY CIRCUIT HAVING PHASE COMPENSATION CIRCUIT - In a power supply circuit, an error amplifier controls a main transistor based on a detection voltage according to an output voltage and a reference voltage corresponding to a target voltage of the output voltage such that the output voltage coincides with the target value. A phase compensation circuit for the power supply circuit includes a level shift circuit and a phase compensation capacitor. The level shift circuit generates a shift voltage by shifting a dc component of the output voltage toward a ground potential by a predetermined voltage, and outputs the shift voltage from an output terminal of the level shift circuit. The phase compensation capacitor is disposed on a route between the output terminal of the level shift circuit and an input terminal of an amplifier circuit of the error amplifier. | 05-30-2013 |
20130141066 | VOLTAGE REGULATOR - A voltage regulator includes a voltage generation unit, a first resistor section, and a second resistor section. The voltage generation unit compares a reference voltage level with a voltage level of a first node and generates an output voltage. The first resistor section includes a first sub-resistor and a second sub-resistor between the first node and a ground voltage node, and controls a connection between the first sub-resistor and the second sub-resistor to change a resistance value of the resistors. The second resistor section includes a reference resistor, a plurality of unit resistors, and a plurality of step resistors, and controls connections of the unit resistors and the step resistors to change a resistance value of the resistors. | 06-06-2013 |
20130147448 | Adaptive Bias for Low Power Low Dropout Voltage Regulators - A low dropout (LDO) voltage regulator includes a voltage regulation loop for providing a gate drive signal to an output device, the gate drive signal proportional to an output current. The voltage regulation loop includes a current bias input for receiving a bias current. The LDO voltage regulator further includes a current bias control circuit for providing the adaptive bias current at a first value that is proportional to current limit value lab and the width-to-length ratio of transistors of the transconductance amplifier when the output current less than or equal to a threshold and increases the bias current from a threshold to a current limit value. The output current varies substantially linearly over a range of output current values between the threshold and the current limit value. | 06-13-2013 |
20130241504 | SELF-CALIBRATING, STABLE LDO REGULATOR - A substantially unconditionally stable LOD regulator includes has first and second current paths. The first current path provides a reference current. The second current path receives an input voltage for developing a differential current with respect to the reference current based on the input voltage. The second current path has a sense resistor for sensing the differential current. A first current source biases the first and second current paths. A third current path senses the differential current and develops the input voltage in response thereto to control the differential current. A second current source biases the second current path. A first voltage follower circuit receives a first voltage on a first side of the sense resistor to provide an analog voltage output, and a second voltage follower circuit receives a second voltage on a second side of the sense resistor to provide a digital voltage output. | 09-19-2013 |
20130257401 | REGULATOR WITH LOW DROPOUT VOLTAGE AND IMPROVED OUTPUT STAGE - The regulator with low dropout voltage comprises an error amplifier and an output stage comprising an output transistor and a buffer circuit comprising an input connected to the output node of the error amplifier, an output connected to the output transistor, a follower amplifier connected between the input and the output of the buffer circuit. The buffer circuit furthermore comprises a transistor active load connected to the output of the follower amplifier and a negative feedback amplifier arranged in common gate configuration and connected between the output of the follower amplifier and the gate of the transistor of the active load. | 10-03-2013 |
20130271100 | HIGH POWER SUPPLY REJECTION LINEAR LOW-DROPOUT REGULATOR FOR A WIDE RANGE OF CAPACITANCE LOADS - A method to maintain stability of a low drop-out linear voltage regulator (LDO). The method includes sensing, by a voltage controlled variable resistor, a node voltage in a feedback network of the LDO linear voltage regulator, wherein the feedback network comprises an error amplifier configured to regulate an output voltage level of the LDO based on a reference voltage, wherein the node voltage has a dependency on a resistive load current of the LDO, and adjusting, by the voltage controlled variable resistor and based on the sensed node voltage, a resistance value of a RC network in the feedback network, wherein the adaptive RC network produces an adaptive zero in a transfer function of the feedback network, wherein the adaptive zero reduces phase margin degradation due to an output non-dominant pole in the transfer function, and wherein a frequency of the adaptive zero is inversely proportional to the resistance value. | 10-17-2013 |
20130278233 | LDO (LOW DROP OUT) HAVING PHASE MARGIN COMPENSATION MEANS AND PHASE MARGIN COMPENSATION METHOD USING THE LDO - Disclosed herein are an LDO having a phase margin compensation means and a phase margin compensation method using the same. The phase margin compensation method according to an exemplary embodiment of the present invention includes: outputting, by reference voltage generation unit, reference voltage Vout | 10-24-2013 |
20130285631 | Low-Dropout Voltage Regulator - A low-dropout voltage regulator includes a power transistor configured to receive an input voltage and to provide a regulated output voltage at an output voltage node. The power transistor includes a control electrode configured to receive a driver signal. A reference circuit is configured to generate a reference voltage. A feedback network is coupled to the power transistor and is configured to provide a first feedback signal and a second feedback signal. The first feedback signal represents the output voltage and the second feedback signal represents an output voltage gradient. An error amplifier is configured to receive the reference voltage and the first feedback signal representing the output voltage. The error amplifier is configured to generate the driver signal dependent on the reference voltage and the first feedback signal. The error amplifier includes an output stage that is biased with a bias current responsive to the second feedback signal. | 10-31-2013 |
20140028274 | REGULATOR - Provided is a regulator configured to output a stable voltage even when a power supply voltage fluctuates suddenly. The regulator includes: a reference voltage circuit; a differential amplifier; a depletion type NMOS transistor; and a bleeder circuit, in which a power supply terminal of the differential amplifier is connected to an output terminal of the regulator. Further, a power supply terminal of the reference voltage circuit is connected to the output terminal of the regulator. | 01-30-2014 |
20140070782 | MODULAR LOW-POWER UNIT WITH ANALOG SYNCHRONIZATION LOOP USABLE WITH A LOW-DROPOUT REGULATOR - A low-power-mode unit connected in parallel with a low-dropout regulator to provide a low-power mode includes a power P-MOS transistor, a differential amplifier, and an analog synchronization loop. The analog synchronization loop is configured to add a variable voltage offset depending on a total current at the output such that, in a high-power mode, the low-power unit current flowing through the P-MOS transistor is not zero, while being substantially smaller than the low-dropout regulator current flowing through the low-dropout regulator, and smaller than a predetermined value. | 03-13-2014 |
20140077777 | LOW DROPOUT REGULATOR - Aspects are directed to low dropout regulation. In accordance with one or more embodiments, an apparatus includes a charge pump that generates an output using a reference voltage, a low dropout (LDO) regulator circuit, current-limit and a voltage-limit circuit. The LDO circuit includes an amplifier powered by the charge pump and that provides an LDO voltage output. The voltage-limit circuit includes a transistor coupled between a voltage supply line and the LDO regulator circuit and a gate driven by the charge pump. The voltage-limit circuit limits voltage coupled between the voltage supply line and the LDO regulator circuit based upon the output of the charge pump, such as by coupling the voltage at the voltage supply line via source/drain connection of the transistor under low-voltage conditions, and by providing a limited voltage to the LDO regulator circuit under high voltage conditions on the voltage supply line. | 03-20-2014 |
20140091775 | TWO-STAGE LOW-DROPOUT LINEAR POWER SUPPLY SYSTEMS AND METHODS - Aspects of the present invention include a low-dropout (LDO) linear power supply system. The system includes a pass-element configured to generate an output voltage at an output based on an input voltage. The system also includes a compensation amplifier stage coupled to the output and configured to provide frequency compensation and provide a desired frequency response of the output voltage. The system further includes a gain amplifier stage interconnecting the compensation amplifier stage and the pass-element and configured to provide DC gain scaling to generate the output voltage substantially proportional to the input voltage within a given range of the input voltage. | 04-03-2014 |
20140117957 | VOLTAGE REGULATOR - A voltage regulator includes an operational amplifier that compares a feedback voltage that is proportional to an output voltage and a predetermined reference voltage that corresponds to a desired output voltage. The operational amplifier controls the conduction state of an output transistor according to the comparison. A detecting circuit monitors the operating state of the operational amplifier, and in the case that the operational amplifier is not operating, outputs a signal which causes the output transistor to be placed in a non-conductive state. | 05-01-2014 |
20140139197 | METHOD AND APPARATUS FOR BYPASS MODE LOW DROPOUT (LDO) REGULATOR - A bypass low dropout regulator has a pass gate coupled to a voltage rail. The pass gate receives a pass gate control signal on a pass gate control line and controllably drops a voltage from a rail to a regulated output in accordance with the pass gate control signal. A differential amplifier generates the pass gate control voltage using a reference and feedback from the regulated output. A bypass switch selectively bypasses the regulator control signal, in response to a bypass signal, by placing a pass gate ON voltage on the pass gate control line. Optionally, and ON-OFF mode circuit selectively disables the pass gate in response to a system ON-OFF signal. | 05-22-2014 |
20140159682 | LDO/HDO Architecture Using Supplementary Current Source to Improve Effective System Bandwidth - An LDO/HDO circuit adds a supplementary current source to supply the output node. The current boosting section includes a digital comparator with a first input connected to the LDO's feedback loop and a second input connected to a reference level. The comparator then generates a digital output used to control the supplementary current source. This approach also can be used in a far-side implementation, where the local supply level for the load is boosted by the current source based a comparison of this local level and the output of the LDO. Miller capacitive compensation is also considered. Current in shunted to ground from a node in the Miller loop, where the level is controlled by the output of a digital comparator base on a comparison of the circuit's output voltage and a reference level. | 06-12-2014 |
20140159683 | Settling Time and Effective Band Width for Op-Amps Using Miller Capacitance Compensation - An LDO/HDO circuit adds a supplementary current source to supply the output node. The current boosting section includes a digital comparator with a first input connected to the LDO's feedback loop and a second input connected to a reference level. The comparator then generates a digital output used to control the supplementary current source. This approach also can be used in a far-side implementation, where the local supply level for the load is boosted by the current source based a comparison of this local level and the output of the LDO. Miller capacitive compensation is also considered. Current in shunted to ground from a node in the Miller loop, where the level is controlled by the output of a digital comparator base on a comparison of the circuit's output voltage and a reference level. | 06-12-2014 |
20140176098 | FEED-FORWARD COMPENSATION FOR LOW-DROPOUT VOLTAGE REGULATOR - A voltage regulator includes a pass element having a control input coupled to a control node and operable to generate an output voltage at an output node, a negative feedback amplifier operable to receive a reference voltage and the output voltage and generate a signal at the control node based on a difference between the reference voltage and the output voltage, and a noise cancellation circuit coupled to the control node and the output node and operable to generate a bias current at the control node based on the output voltage. | 06-26-2014 |
20140191739 | LOW DROP-OUT REGULATOR - Exemplary embodiments disclose a low drop-out regulator including an error amplification unit which includes a zero compensation circuit configured to compensate a plurality of poles which are generated by an output terminal and a buffer, the error amplification unit is configured to generate a first comparison signal in response to a reference voltage and a feedback voltage, the buffer is configured to generate a second comparison signal in response to the first comparison signal and an input voltage, a pass unit configured to provide an output voltage and a load current to the output terminal in response to the second comparison signal and the input voltage, and a feedback unit configured to provide the feedback voltage to the error amplification unit in response to the output voltage. A driving current of the buffer is independently adjusted with respect to the load current. | 07-10-2014 |
20140210440 | Clean Startup and Power Saving in Pulsed Enabling of LDO - Circuits and methods to achieve a clean start-up process and power saving of pulsed enabled electronic devices having an output capacitor and components requiring biasing during normal operating conditions are disclosed. These electronic devices could be e.g. LDOs, amplifiers or buffers. A set of switches are enabling bias currents from the output capacitor to internal nodes requiring biasing under normal operational conditions as e.g. output nodes of amplifying means. | 07-31-2014 |
20140253071 | System and Method for a Power Supply - In accordance with an embodiment, a method of controlling a power supply node includes measuring a voltage of the power supply node, determining a first current based on the measuring, determining a first current and a second current based on the measuring, and summing the first current and the second current at the power supply node. Determining the first current includes operating a first controller having a first bandwidth, and determining the second current includes operating a second controller having a second bandwidth greater than the first bandwidth. | 09-11-2014 |
20140266104 | AN LDO AND LOAD SWITCH SUPPORTING A WIDE RANGE OF LOAD CAPACITANCE - A method to maintain stability of a low drop-out (LDO)/load switch linear voltage regulator (LVR). The method includes determining, during a power-up phase and by a capacitance sensing circuit, an estimated output capacitance value at an output node of the LDO/load switch LVR, and adjusting, based on the estimated output capacitance value, an adaptive RC network in the LDO/load switch LVR, wherein the adaptive RC network produces an adaptive zero in a feedback network transfer function of the LDO/load switch LVR, wherein the adaptive zero reduces an effect of a non-dominant pole in the open loop transfer function of the LDO/load switch LVR, and wherein a frequency of the adaptive zero is inversely proportional to the estimated output capacitance value. | 09-18-2014 |
20140266105 | LOW DROP OUT REGULATOR AND CURRENT TRIMMING DEVICE - A regulator comprises an amplifier, a bias circuit, and a current trimming circuit. The bias circuit is coupled to the amplifier and supplies a first bias current to the amplifier in a first mode of a system including the regulator. The current trimming circuit is coupled to the bias circuit to adjust the first bias current. | 09-18-2014 |
20140266106 | LDO AND LOAD SWITCH SUPPORTING A WIDE RANGE OF LOAD CAPACITANCE - A novel architecture and method to maintain stability of a low drop-out (LDO)/load switch linear voltage regulator (LVR). The architecture and method also support optionally determining, during a power-up phase and by a capacitance sensing circuit, an estimated output capacitance value at an output node of the LDO/load switch LVR, and adjusting, based on the estimated output capacitance value, an adaptive RC network in the LDO/load switch LVR, wherein the adaptive RC network produces an adaptive zero in a feedback network transfer function of the LDO/load switch LVR, wherein the adaptive zero reduces an effect of a non-dominant pole in the open loop transfer function of the LDO/load switch LVR, and wherein a frequency of the adaptive zero is inversely proportional to the estimated output capacitance value. | 09-18-2014 |
20140266107 | USB Regulator with Current Buffer to Reduce Compensation Capacitor Size and Provide for Wide Range of ESR Values of External Capacitor - A voltage regulator comprises a large gm current buffer driver added between a first stage of an operation amplifier and a last stage power transistor. This current buffer allows a significant reduction in the maximum internal and external compensation capacitances needed for regulator stability. The current buffer compensation circuit allows a wide range of external capacitor sizes that increases the flexibility in choosing the external capacitor types (with low to high ESR ratings). | 09-18-2014 |
20140285166 | LOW-DROPOUT REGULATOR AND METHOD FOR REGULATING VOLTAGE - In one embodiment a low-dropout regulator comprises a first differential amplifier (Nmos | 09-25-2014 |
20140306676 | COMPENSATION MODULE and VOLTAGE REGULATOR - A compensation module for a voltage regulation device having a gain stage, an output stage and a miller compensation module includes a low-output-impedance non-inverting amplifier unit coupled to a gain output of the gain stage and an output-stage input of the output stage. | 10-16-2014 |
20140312866 | LINEAR REGULATOR IC WITH VERSATILE GROUND PIN - A linear regulator integrated circuit may be formed having four external terminals including a voltage input (Vin) terminal, a voltage output (Vout) terminal, a Set terminal, and an operational amplifier (op amp) power terminal. A user connects an external resistor to the Set terminal for creating a reference voltage. An op amp controls a pass (or series transistor) to cause an output voltage at the Vout terminal to equal the reference voltage. The op amp has a first power supply terminal internally coupled to the Vin terminal and a second power supply terminal coupled to the op amp power terminal. The op amp power terminal allows a user to externally couple the op amp second power supply terminal to either the Vout pin (for high voltage applications), system ground (for medium voltage applications), or another voltage (to provide additional headroom in very low voltage applications). | 10-23-2014 |
20140312867 | LOW DROP OUT VOLTAGE REGULATOR AND RELATED METHOD OF GENERATING A REGULATED VOLTAGE - A low drop out voltage regulator includes an operational transconductance amplifier configured to be supplied with a supply voltage of the regulator, receive as inputs a reference voltage and a feedback voltage, and generate an intermediate current based upon a difference between the reference voltage and the feedback voltage. A current-to-voltage amplification stage is configured to be supplied with a boosted voltage greater than the supply voltage from a high voltage line, receive as input the intermediate current, and generate a driving voltage that is changed based upon the intermediate current. A pass transistor is controlled with the driving voltage to keep constant on a second conduction terminal thereof a regulated output voltage. A feedback network generates the feedback voltage based on the regulated output voltage. | 10-23-2014 |
20140320097 | NEGATIVE VOLTAGE REGULATION CIRCUIT AND VOLTAGE GENERATION CIRCUIT INCLUDING THE SAME - A negative voltage regulation circuit includes an operational amplifier configured to receive a feedback voltage and an input voltage, a pull-up element configured to pull-up drive a first node based on output voltage of the operational amplifier, a load element coupled between the first node and a negative voltage terminal, a pull-down element configured to pull-down drive a final negative voltage output terminal using a voltage of the negative voltage terminal based on a voltage level of the first node, and a voltage division unit coupled between the final negative voltage output terminal and a pull-up voltage terminal, and configured to generate the feedback voltage by voltage division. | 10-30-2014 |
20140340060 | VOLTAGE REGULATOR WITH IMPROVED LINE REJECTION - Devices and methods are provided for generating a regulated output voltage with improved line rejection based on an input voltage and a reference voltage. The device may include a pass transistor and a replica transistor, wherein source ports of the pass transistor and the replica transistor are coupled to the input voltage, a drain port of the pass transistor is coupled to the output voltage, and a gate port of the pass transistor is coupled to a gate port of the replica transistor. The device may further include a coupling circuit configured to couple current from the drain port of the replica transistor to the gate port of the replica transistor, the coupling circuit further configured to control voltage on the drain port of the replica transistor based on the reference voltage. | 11-20-2014 |
20140368176 | GENERATING A ROOT OF AN OPEN-LOOP FREQENCY RESPONSE THAT TRACKS AN OPPOSITE ROOT OF THE FREQUENCY RESPONSE - In an embodiment, an electronic includes a feedback-coupled circuit stage and a compensation circuit stage. The feedback-coupled stage is configured to drive a load, and the compensation stage is coupled to the feedback-coupled stage such that a combination of the compensation and feedback-coupled stages has a frequency response including a first root and an opposite second root that depend on the load. For example, an embodiment of such an electronic circuit may be a low-dropout (LDO) voltage regulator that lacks a large output capacitance for forming a dominant pole to stabilize the regulator. The regulator includes a feedback-coupled stage that generates and regulates an output voltage, and includes a compensation stage that is designed such that the frequency response of the regulator includes a zero that tracks a non-dominant output pole of the regulator so that the output pole does not adversely affect the stability of the regulator. | 12-18-2014 |
20140375289 | Active Clamps for Multi-Stage Amplifiers in Over/Under-Voltage Condition - The present document relates to multi-stage amplifiers, such as linear regulators or linear voltage regulators (e.g. low-dropout regulators) configured to provide a constant output voltage subject to load transients. A multi-stage amplifier is described, having a differential amplification stage configured to provide a stage output voltage at an output node, based on a first input voltage and a second input voltage. Furthermore, the multi-stage amplifier comprises a second amplification stage comprising an amplifier current source configured to provide an amplifier current; and an amplifier transistor arranged in series with the amplifier current source; wherein a gate of the amplifier transistor is coupled to the output node of the differential amplification stage. In addition, the multi-stage amplifier comprises a detection circuit. | 12-25-2014 |
20150015223 | Low Dropout Regulator and Related Method - A device includes an error amplifier, a standby current source, a charging current source, a voltage divider, and a first switch. The error amplifier has a negative input terminal and a positive input terminal. The standby current source has a control terminal electrically connected to an output terminal of the error amplifier. The voltage divider has an input terminal electrically connected to an output terminal of the standby current source, and an output terminal electrically connected to the positive input terminal of the error amplifier. The charging current source has a control terminal electrically connected to the output terminal of the error amplifier. The first switch has a first terminal electrically connected to an input terminal of the charging current source, and a second terminal electrically connected to a first power supply node. | 01-15-2015 |
20150015224 | POWER SUPPLY CIRCUIT - A power supply circuit includes a transistor disposed between an input terminal to which an input voltage is applied and an output terminal to which an output voltage is applied, and an error amplifier configured to compare a feedback voltage varied based on the output voltage and a reference voltage, and control the transistor based on a result of the comparison, the reference voltage being generated by selectively using the input voltage or the output voltage. | 01-15-2015 |
20150022166 | Low-Dropout Voltage Regulator - A low-dropout voltage regulator includes a power transistor configured to receive an input voltage and to provide a regulated output voltage at an output voltage node. The power transistor includes a control electrode configured to receive a driver signal. A reference circuit is configured to generate a reference voltage. A feedback network is coupled to the power transistor and is configured to provide a first feedback signal and a second feedback signal. The first feedback signal represents the output voltage and the second feedback signal represents an output voltage gradient. An error amplifier is configured to receive the reference voltage and the first feedback signal representing the output voltage. The error amplifier is configured to generate the driver signal dependent on the reference voltage and the first feedback signal. The error amplifier includes an output stage that is biased with a bias current responsive to the second feedback signal. | 01-22-2015 |
20150028835 | AREA-EFFICIENT FREQUENCY COMPENSATION - A DC-to-DC converter includes an error integrator that further includes a first amplifier and a second amplifier that each includes a first input for receiving a reference voltage and a second input for receiving a feedback voltage, a capacitor to an output of the second amplifier, and a resistor including a first end being coupled to an output of the first amplifier and a second end being coupled to the capacitor. | 01-29-2015 |
20150061621 | LOW DROP-OUT REGULATOR WITH A CURRENT CONTROL CIRCUIT - A circuit including a low drop-out regulator (LDO) has a current control loop configured and connected to detect whether an external capacitor is connected to the output of the LDO. The current control loop includes a differential amplifier, a current source capable to output different reference currents and a small MOS transistor. The circuit may be operated in an output capacitor detection mode when started and in a regulated voltage source mode otherwise. In the output capacitor detection mode, the small MOS transistor is driven by the differential amplifier and drives the LDO's power MOS transistor depending on a difference between a current through the small MOS transistor and the reference current output by the current source. Components of the current control loop may be used during regulated voltage source mode for short circuit protection. | 03-05-2015 |
20150061622 | Method and Apparatus for Limiting Startup Inrush Current for Low Dropout Regulator - A low dropout (LDO) regulator with a limited startup inrush current is disclosed. The LDO includes a power source, error amplifier, pass transistor, feedback network, and a current limit control whose input is electrically connected to the pass transistor and the electrical output of the error amplifier and whose output limits current during startup. The LDO can include a current control limit comparator including a power source, and output of the pass transistor. The LDO can also include a bypass mode current control limit comparator having a first input voltage of the error amplifier, and a second input voltage from the error amplifier. | 03-05-2015 |
20150061623 | VOLTAGE REGULATOR OF LOW-DROP-OUTPUT TYPE AND OPERATION METHOD OF THE SAME - There are provided a voltage regulator of a low-drop-output type, and an operation method of the same. The voltage regulator includes: an error amplifying unit providing a gate signal according to a voltage difference between a reference voltage and a feedback voltage; a semiconductor switch regulating a current between a supply voltage terminal and a ground according to the gate signal; a voltage detecting unit detecting the supply voltage to provide a detected voltage; a feedback control unit providing a feedback control signal according to the detected voltage; and a feedback voltage regulating unit connected between the semiconductor switch and the ground to regulate the feedback voltage according to the feedback control signal. | 03-05-2015 |
20150077076 | Dual Mode Low Dropout Voltage Regulator - A dual mode low dropout voltage regulator has a low dropout regulation mode and a bypass mode and provides a smooth transition between mode transitions taking place under load. When an accessory requires a larger voltage level, a bypass signal commands the dual mode low dropout voltage regulator to go into bypass mode and transfer voltage level of the unregulated input voltage source to the output of the dual mode low dropout voltage regulator. The dual mode low dropout voltage regulator provides a smooth transition to the bypass to prevent the output of the dual mode low dropout voltage regulator from decreasing or having a “brown out” until a pass transistor is forced to turn on fully to provide the voltage level of the unregulated input voltage source to fully bypass the low dropout regulating mode of operation. | 03-19-2015 |
20150084609 | FEEDBACK NETWORK FOR LOW-DROP-OUT GENERATOR - A circuit may include a differential amplifier and a feedback network. The feedback network may have a chain of resistance sets coupled in series, with a first end terminal coupled to an output terminal of the differential amplifier and a second end terminal coupled to a power reference terminal of the differential amplifier. Respective nodes may be coupled between successive ones of the resistance sets. A feedback terminal may be coupled to an inverting input terminal of the differential amplifier. A controller may control a set of switches to electrically couple a given node to the feedback terminal. A first resistance set of the chain adjacent the first end terminal may be two resistance subsets coupled in series, with an intermediate node coupled therebetween. A programmable current generator may have a current output coupled to the intermediate node and may produce a controlled current flowing at the current output terminal. | 03-26-2015 |
20150115918 | LOW DROP OUT SUPPLY ASYMMETRIC DYNAMIC BIASING - Methods and apparatus for a dynamic bias generator are provided. In an example, a dynamic bias generator for a voltage regulator can include a slope generator and a peak detector coupled to the slope generator. In certain examples, the slope generator and the peak detector can receive a representation of output current of the voltage regulator and can adjust a bias control voltage at an output of the peak detector in response to a change in the output current of the voltage regulator. | 04-30-2015 |
20150123634 | INTEGRATED REGULATOR, IN PARTICULAR VOLTAGE REGULATOR, AND CONTROLLER FOR PASSENGER PROTECTION MEANS, WITH CONFIGURABLE OUTPUT VOLTAGE OF THE CONTROLLER - An integrated regulator, in particular a voltage regulator, for a personal protection arrangement in a vehicle, includes a regulating element that converts an input signal into an output signal having a defined value, and a control application circuit that applies control to the regulating element to generate the output signal having the defined value. The control application circuit outputs the output signal via the regulating element with at least two different selectable values as a function of a specifying signal, such that for selection of the value of the output signal, a configuration circuit receives at least one configuration signal and, as a function of a configuration ascertained in the context of evaluation, selects one of at least two different specifying signals and applies it to the control application circuit to output the output signal having the selected value. | 05-07-2015 |
20150130434 | FAST CURRENT LIMITING CIRCUIT IN MULTI LOOP LDOS - A circuit and method for providing a current limiting feature in a low dropout (“LDO”) linear voltage regulator. A pass element generates an output voltage that is less than the input voltage. The pass element is normally enabled by an error amplifier that compares a feedback signal from the output of the pass element with a reference signal. However, the pass element may be enabled by a current limiting circuit that bypasses the error amplifier to limit the current generated at the output of the pass element. | 05-14-2015 |
20150137780 | Self-Adjustable Current Source Control Circuit For Linear Regulators - A self-adjustable current source control circuit utilizes a replica output stage, a sink current source that generates a reference current, and a negative feedback circuit to generate a sink current between a linear regulator output terminal and ground only when a load circuit connected to the linear regulator is in a low power consuming state. The replica output stage includes an 1:N scaled replica of the linear regulator's NMOS (or NPN) output stage transistor, and the negative feedback circuit utilizes two PMOS (or PNP) negative feedback transistors having the same N:1 size ratio and connected as a common gate amplifier, whereby one of the two negative feedback transistors turns on to draw the desired sink current from the regulator output terminal only when the load current falls below N times the reference current (i.e., only the load current is drawn through the output stage transistor during high load current conditions). | 05-21-2015 |
20150137781 | LOW DROPOUT CIRCUIT CAPABLE OF CONTROLLED STARTUP AND METHOD OF CONTROLLING SAME - A low dropout (LDO) circuit capable of controlled startup and a method of controlling the same are disclosed herein. The LDO circuit includes an amplifier, a pass element, and a startup control circuit. The amplifier receives a feedback voltage determined by an output voltage and a predetermined reference voltage, and provides a first voltage determined by the feedback voltage and the reference voltage. The pass element is connected to an input power and an output node for providing the output voltage. The startup control circuit includes a current source, and forward one of the first voltage, provided by the amplifier based on the level of the output voltage, and a second voltage, generated using the current source, to the gate of the pass element. | 05-21-2015 |
20150301542 | REGULATION CIRCUIT ASSOCIATED WITH SYNCHRONOUS RECTIFIER PROVIDING CABLE COMPENSATION FOR THE POWER CONVERTER AND METHOD THEREOF - A regulation circuit of a power converter for cable compensation according to the present invention comprises a signal generator generating a compensation signal in accordance with a synchronous rectifying signal. An error amplifier has a reference signal for generating a feedback signal in accordance with an output voltage of the power converter. The compensation signal is coupled to program the reference signal. The feedback signal is coupled to generate a switching signal for regulating an output of the power converter. The regulation circuit of the present invention compensates the output voltage without a shunt resistor to sense the output current of the power converter for reducing power loss. | 10-22-2015 |
20150309519 | REDUNDANT ELECTRIC CIRCUIT FOR CUTTING OFF THE POWER SUPPLY TO A PIECE OF EQUIPMENT - The invention concerns an electric circuit designed to control a power supply of a piece of electrical equipment, the electric circuit comprising a piece of electrical equipment and a source of supply voltage, and further having, as inputs, at least two discrete electrical signals of which the values condition the cutting off of the power supply to the piece of equipment, the circuit being characterised in that it further comprises:—a module for the redundant comparison of the discrete electric signals, comprising two branches for comparing said signals, parallel to one other, each branch being designed to supply, at the output, a control signal representative of each of the comparisons of said discrete electrical signals, and—a first module for cutting off the power supply to the piece of electrical equipment comprising two switches in series, each one being controlled respectively by one of the two control signals. The invention also concerns a system for acquiring, processing and communicating avionics data installed in an aircraft, comprising such an electric circuit. | 10-29-2015 |
20150311354 | SEMICONDUCTOR DEVICES - The invention provides a voltage regulator. The voltage regulator ( | 10-29-2015 |
20150311691 | OVERCURRENT PROTECTION CIRCUIT, SEMICONDUCTOR DEVICE AND VOLTAGE REGULATOR - To provide an overcurrent protection circuit which prevents an excessive current from flowing to an output terminal for a long time, and a semiconductor device and a voltage regulator each equipped with the overcurrent protection circuit. An overcurrent protection circuit is configured to include a first transistor which allows a current proportional to an output current flowing through an output transistor to flow, a constant current circuit which allows a reference current to flow, a comparison circuit which compares the current flowing through the first transistor and the reference current, and a control circuit which controls a gate of the output transistor by a signal outputted from the comparison circuit. | 10-29-2015 |
20150323947 | Switched Mode Converter with Low-Voltage Linear Mode - In accordance with embodiments of the present disclosure, a system may include an impedance estimator configured to estimate an impedance of a load and generate a target current based at least on an input voltage and the impedance, a voltage feedback loop responsive to a difference between the input voltage and an output voltage of the load, and a current controller configured to, responsive to the voltage feedback loop, the impedance estimator, and the input voltage, generate an output current to the load. | 11-12-2015 |
20150338865 | HIGH-SPEED MULTIPHASE PRECISION CLAMPING CIRCUIT - The circuit of the present disclosure is a high-speed precision clamp (voltage limiter) for overvoltage or undervoltage protection. One aspect of the circuit includes using a peak detector in the feedback path of a clamp having a super-diode architecture. The resulting circuit performs well for high-speed applications. The peak detector can be replicated (at least in part) to accommodate a multiplicity of phase-shifted input voltages by using only one common peak detection capacitor and ensuring area savings in integrated-circuit implementations. | 11-26-2015 |
20150338866 | DC-DC CONVERTER CONTROLLER APPARATUS WITH DUAL-COUNTER DIGITAL INTEGRATOR - DC-DC converter PWM controllers and dual counter digital integrators are presented for integrating an error between a reference voltage signal and a feedback voltage signal, in which a comparator, dual counters, and a DAC are used to provide a compensated reference to a modulator loop comparator which generates a PWM switching signal for controlling a power converter output voltage, with the second counter being selectively incremented or decremented when the first counter output indicates a predetermined value after the first counter output transitions in one direction through a predetermined count range to enhance loop stability, and a startup mode control allows fast integrator operation during initialization, with the ability to freeze integrator operation during overcurrent conditions. | 11-26-2015 |
20150346748 | SYSTEMS AND METHODS FOR A LOW DROPOUT VOLTAGE REGULATOR - A semiconductor device including a voltage regulator is disclosed. The voltage regulator may include a multipath amplifier stage, a driver stage coupled to the multipath amplifier stage, a dynamic compensation circuit coupled to the multipath amplifier stage, and a current compensation circuit. The dynamic compensation circuit may be operable to provide a varying level of compensation to the multipath amplifier stage, where the varying level of compensation proportional to a current level associated with the load; and the current compensation circuit may be operable to allow a minimum current level at the driver stage. | 12-03-2015 |
20150346750 | Current Sink Stage for LDO - An LDO circuit with a current sink stage reduces significantly overshooting of the output voltage due to sudden changes of output current. The activation of the current sink stage is independent of the overshoot percentage of the regulated output voltage. The disclosure doesn't require large output capacitors to avoid the possibility of brownouts of chips supplied by the LDO. | 12-03-2015 |
20150355653 | Linear Voltage Regulator Utilizing a Large Range of Bypass-Capacitance - Amplifiers, notably multi-stage amplifiers, such as linear regulators (e.g. low-dropout regulators) configured to provide a constant output voltage subject to load transients are presented. An amplifier is described, which comprises a first amplification stage configured to provide an intermediate voltage, based on an outer feedback voltage and based on a reference voltage. Furthermore, the amplifier comprises an output stage configured to provide a load current at an output voltage based on the intermediate voltage. In addition, the amplifier comprises an outer feedback circuit configured to derive the outer feedback voltage from the output voltage. The output stage comprises a buffer configured to provide a drive voltage based on the intermediate voltage and based on an inner feedback voltage derived from the output voltage. The buffer comprises a pass device which is configured to provide the load current at the output voltage based on the drive voltage. | 12-10-2015 |
20150362934 | VOLTAGE REGULATOR - A voltage regulator includes an operational amplifier that compares a feedback voltage that is proportional to an output voltage and a predetermined reference voltage that corresponds to a desired output voltage. The operational amplifier controls the conduction state of an output transistor according to the comparison. A detecting circuit monitors the operating state of the operational amplifier, and in the case that the operational amplifier is not operating, outputs a signal which causes the output transistor to be placed in a non-conductive state. | 12-17-2015 |
20150362935 | Class AB inverting driver for PNP bipolar transistor LDO regulator - A driver circuit for a PNP power transistor in an LDO regulator uses a Class AB (push-pull) buffer to supply the necessary base current to an NPN driver transistor, where the NPN driver transistor has its collector connected to the base of the PNP power transistor. A front end circuit of the driver, coupled to drive the Class AB buffer, uses a current diverting transistor, where a first portion of the current is used to control the pull-up transistor in the Class AB buffer, and the remainder of the current is used to control the pull-down transistor in the Class AB buffer, so the driver is very efficient. The portion of the driver circuit between the input of the driver circuit and the base of the NPN driver transistor is an inverting circuit. The driver can properly operate with an input voltage within two diode drops of ground. | 12-17-2015 |
20150362936 | LDO REGULATOR POWERED BY ITS REGULATED OUTPUT VOLTAGE FOR HIGH PSRR - In an LDO regulator, two feedback loops are created. The first feedback loop includes a high power PNP bipolar power transistor connected in series between the input voltage Vin terminal and the output voltage Vout terminal. The first feedback loop includes a first error amplifier that controls a drive transistor to drive the base of the power transistor such that Vout matches a set voltage Vset. This first feedback loop circuitry uses an operating voltage (the upper rail voltage) that is regulated by a second feedback loop and is approximately 300 mV greater than Vout. As a result, the control circuitry will be powered by a low ripple supply to improve output PSRR. Further, the power transistor is connected such that any noise in the input voltage is a common mode voltage across the base-emitter of the transistor. | 12-17-2015 |
20150370273 | HYSTERETIC POWER CONVERTER WITH CALIBRATION CIRCUIT - A power converter includes a first load terminal used to supply a current to a load and a second load terminal used to return a feedback voltage based on the current. A calibration circuit supplies a calibrated voltage processed from the feedback voltage, and a hysteretic comparator controls a current level of the current based on a difference between the feedback voltage and the calibrated voltage. | 12-24-2015 |
20150378378 | POWER CONVERTER AND METHOD FOR REGULATING LINE TRANSIENT RESPONSE OF THE POWER CONVERTER - A power converter includes an input and an output with an energy storage circuit and a power switching circuit coupled between the input and the output. A feedback circuit generates a feedback voltage which is differentially compared to a reference in an error amplifier circuit to generate an error amplification signal. A comparator circuit generates a control signal for controlling on/off of the power switching circuit based on a first comparison signal related to the error amplification signal and a second comparison signal related to a charging current of the energy storage circuit. A regulating circuit is coupled between an output of the error amplifier circuit and an input of the comparator circuit for receiving the first comparison signal, the regulating circuit is configured to couple a voltage compensation signal related to an input voltage received by the input to an output of the error amplifier, so as to reduce a variation amount of the error amplification signal when the input voltage varies. | 12-31-2015 |
20150378379 | Voltage Regulator Output Overvoltage Compensation - Multi-stage amplifiers which provide a constant output voltage subject to load transients are presented. The amplifier has a pass device to source a load current at an output voltage. The amplifier has a first driver circuit to control the pass device based on a reference voltage and based on a first feedback voltage. The amplifier has a sink transistor to sink a first current from the output node to a low potential. Furthermore, the amplifier comprises a bypass transistor configured to couple a sense voltage, to sink a second current from the output node to the low potential. There is a second driver circuit to control the sink transistor and the bypass transistor, based on the reference voltage and based on a second feedback voltage. A voltage divider derives the first feedback voltage, the second feedback voltage and the sense voltage from the output voltage. | 12-31-2015 |
20160004266 | APPARATUS AND METHOD FOR MULTIPHASE SMPS INTERLEAVING - In described examples, a phase interleaver obtains (i) a first signal indicating a variance between a reference voltage and a regulated output voltage and (ii) a second signal indicating a voltage across an energy storage device. A voltage regulator includes multiple phase blocks collectively configured to generate the regulated output voltage. In a repeating cycle, (i) the voltage across the energy storage device is increased while the second signal is less than the first signal and (ii) in response to a determination that the second signal is greater than the first signal, the energy storage device is substantially discharged, multiple stages of a clock divider are transitioned in the phase interleaver, and a set of control signals is output from the clock divider. The control signals have a common switching frequency and a common switching period. The control signals control the phase blocks active in generating the output voltage. | 01-07-2016 |
20160004267 | DYNAMIC BIASING FOR REGULATOR CIRCUITS - The disclosed invention provides apparatus and methods for dynamic biasing in electronic systems and circuits. The apparatus and methods disclosed provide non-linear biasing responsive to monitored load conditions. | 01-07-2016 |
20160011611 | FAST RESPONSE PULSE WIDTH MODULATION CONTROL FOR SWITCHING REGULATOR | 01-14-2016 |
20160011613 | CONTROL CIRCUIT WITH CHOPPING AMPLIFIER FOR SWITCHING CONVERTER | 01-14-2016 |
20160018834 | Leakage Reduction Technique for Low Voltage LDOs - The present document relates to multi-stage amplifiers, such as linear regulators (e.g. low-dropout regulators). A method and a circuit for reducing leakage current of such multi-stage amplifiers is presented. A voltage regulator is described. The voltage regulator comprises a pass device configured to provide a load current at a regulated output voltage to an output node of the voltage regulator. A source of the pass device is coupled to a first potential of the voltage regulator. Furthermore, the voltage regulator comprises drive circuitry configured to control the pass device via a gate of the pass device, based on a reference voltage and based on a feedback voltage derived from the output voltage. In addition, the voltage regulator comprises leakage reduction circuitry configured to pull-up the gate of the pass device using a second potential; wherein the second potential is higher than the first potential. | 01-21-2016 |
20160033983 | REGULATOR CIRCUIT - A regulator circuit includes a first MOS transistor having a current channel connected between an input terminal and an output terminal, a regulator control circuit configured to control an amount of a current flowing through the current channel of the first MOS transistor towards the output terminal, a second MOS transistor having a current channel connected between the input terminal and the current channel of the first MOS transistor, and a body diode, a forward direction of which is along a direction from the input terminal to the output terminal, and a switch control circuit configured to switch off the second MOS transistor when a voltage at the input terminal decreases to a predetermined value that is equal to or greater than a voltage at the output terminal. | 02-04-2016 |
20160033984 | VOLTAGE REGULATOR HAVING SOURCE VOLTAGE PROTECTION FUNCTION - A voltage regulator having a source voltage protection function may include an error amplifying unit providing a gate signal depending on a difference in voltage levels between a reference voltage and a feedback voltage, a current adjusting unit adjusting a current between a source input terminal receiving a source voltage and a ground in response to the gate signal, a feedback circuit unit detecting the feedback voltage in a feedback node between the current adjusting unit and the ground, an over-voltage protection unit shutting the current adjusting unit down when an over-voltage condition is detected in the source voltage, and an under-voltage protection unit shutting the current adjusting unit down when an under-voltage condition is detected in the source voltage. | 02-04-2016 |
20160048148 | LOW-DROPOUT VOLTAGE REGULATOR - The invention is directed to a low-dropout voltage regulator (LDO), including a power transistor, a driving stage circuit, a feedback circuit, a bias power source and an auxiliary reference current generation circuit. The power transistor is controlled by a driving signal to convert an input voltage into an output voltage. The feedback circuit generates a feedback voltage according to the output voltage. The driving stage circuit generates the driving signal according to the feedback voltage and the reference voltage. The bias power source provides a bias current. The auxiliary reference current generation circuit is configured to sample an output current, adjust the sampled output current to generate an adjustment current by means of mapping and superpose the adjustment current onto the bias current to generate a reference current to control drive capability of the driving stage circuit. | 02-18-2016 |
20160062375 | CURRENT MODE CONTROL MODULATOR WITH COMBINED CONTROL SIGNALS AND IMPROVED DYNAMIC RANGE - A modulator for controlling a switch circuit of a voltage regulator, including a sense circuit that provides a current sense signal indicative of current through the output inductor, a ramp circuit that develops a ramp voltage on a ramp node using the current sense signal, an error circuit that develops an error signal indicative of output voltage error and that injects the error signal into the ramp node to adjust the ramp voltage, a comparator circuit that compares the ramp voltage with a fixed control voltage to develop a compare signal, and a logic circuit that uses the compare signal to develop a pulse control signal that controls the switch circuit. The output voltage error may be determined by comparing the output voltage with a reference voltage and converting the error voltage to a current applied to the ramp node. | 03-03-2016 |
20160062376 | LOW-DROP-OUTPUT TYPE VOLTAGE REGULATOR AND RF SWITCHING CONTROL DEVICE HAVING THE SAME - A low-drop-output type voltage regulator may include an error amplifier providing a gate signal depending on a voltage difference between a reference voltage and a feedback voltage, a semiconductor switch adjusting a current between an input terminal receiving a battery voltage and a ground, in response to the gate signal, a feedback circuit dividing and detecting a detection voltage in a detection node between the semiconductor switch and the ground and providing the feedback voltage, a voltage sensor sensing the battery voltage, and a feedback voltage controller adjusting a level of the feedback voltage depending on the sensed battery voltage. | 03-03-2016 |
20160062377 | Regulator with Low Dropout Voltage and Improved Stability - The regulator with a low dropout voltage comprises an error amplifier comprising a differential pair of input transistors and a circuit with folded cascode structure connected to the output of the said differential pair, an output stage connected to the output node of the error amplifier, and a Miller compensation capacitor connected between the output stage and the cascode node on the output side (XP) of the cascode circuit; the error amplifier furthermore comprises at least one inverting amplifier module in a feedback loop between the said cascode node and the gate of the cascode transistor of the cascode circuit connected between the said cascode node and the said output node. | 03-03-2016 |
20160077535 | VOLTAGE REGULATOR CIRCUIT - A voltage regulator circuit is provided, which includes a main regulator and at least one auxiliary regulator. The main regulator provides an output voltage and regulates the output voltage according to the output voltage and a reference voltage. Each auxiliary regulator is coupled to the main regulator. Each auxiliary regulator also provides the output voltage and regulates the output voltage according to the output voltage and the reference voltage. Each of the main regulator and the at least one auxiliary regulator provides a branch current of the same magnitude. An output current of the voltage regulator circuit includes the branch currents provided by the main regulator and the at least one auxiliary regulator. | 03-17-2016 |
20160077537 | A LOW DROP-OUT VOLTAGE REGULATOR AND A METHOD OF PROVIDING A REGULATED VOLTAGE - A low drop-out voltage regulator, an integrated circuit, a sensor and a method of providing a regulated voltage are provided. The low drop-out voltage regulator comprises a regulated voltage driver for providing the regulated voltage in response to a control voltage, a feedback-loop circuit for generating the control signal such that the regulated voltage driving circuit provides the regulated voltage, and a pull-up circuit for pulling up the regulated voltage to a supply voltage when a difference between the supply voltage and the control voltage is smaller than a predetermined threshold value. In the feedback-loop circuit a first feedback voltage or a second feedback voltage is generated, respectively, on basis of a first ratio and a second ratio between the feedback voltage and the regulated voltage. The second feedback voltage is generated instead of the first feedback voltage when the regulated voltage is pulled-up to the supply voltage. | 03-17-2016 |
20160085251 | POWER SUPPLY DEVICE - A power supply device has an output portion that generates an output voltage from an input voltage and supplies the output voltage to a load, an output feedback controller that drives the output portion by performing output feedback control, and a first detector that detects, by means of an electromagnetic induction method, a change in a first monitoring target current due to a load change. The output feedback controller reflects a detection result from the first detector into the output feedback control. | 03-24-2016 |
20160085252 | Method And System For An Adaptive Low-Dropout Regulator - Methods and systems for a low-dropout regulator may comprise a voltage regulator comprising: (a) a pass transistor having a first terminal at a control gate, a voltage input at a second terminal, and a voltage output at a third terminal, and (b) an adaptive control circuit (ACC), electrically coupled to a reference voltage and each of the terminals of the pass transistor. The ACC may determine a AV between the second and third terminals and cause an error signal to be applied to the first terminal to keep AV essentially constant as the voltage input varies. The ACC may include a voltage summing circuit electrically coupled to the reference voltage and the input voltage to generate a comparison value. An error amplifier electrically coupled to the control gate and to the voltage summing circuit may generate the error signal from the comparison value and the output voltage. | 03-24-2016 |
20160091905 | System and Method for a Power Supply - In accordance with an embodiment, a method of controlling a power supply node includes measuring a voltage of the power supply node, determining a first current based on the measuring, determining a first current and a second current based on the measuring, and summing the first current and the second current at the power supply node. Determining the first current includes operating a first controller having a first bandwidth, and determining the second current includes operating a second controller having a second bandwidth greater than the first bandwidth. | 03-31-2016 |
20160091907 | POWER SUPPLY INTERFACE - Aspects of the present disclosure are directed to circuits, apparatuses, and methods for power management. According to an example embodiment, an apparatus includes a low drop-out (LDO) voltage-regulation circuit configured to generate a regulated voltage from a voltage provided to a supply terminal of the LDO voltage-regulation circuit. The apparatus also includes switching circuitry coupled to the LDO voltage-regulation circuit and to a plurality of voltage sources. The voltage sources include at least power line carried along with a data bus and another voltage source. Each of the plurality of voltage sources provides a respectively different voltage range. The switching circuitry is configured, in response to a power-related condition of the plurality of voltage sources and while maintaining power to the LDO voltage-regulation circuit, to select and couple one of the voltage sources to the supply terminal and uncouple other ones of voltage sources from the supply terminal. | 03-31-2016 |
20160091909 | SOFT START CIRCUIT AND METHOD FOR DC-DC VOLTAGE REGULATOR - A voltage regulator is provided comprising: a pass transistor that includes a first node coupled to receive an input voltage and a second node coupled to provide a regulated voltage and a control node; an amplifier circuit coupled to produce a control voltage on a control line that is coupled to control a voltage at the control node of the pass transistor, based at least in part upon a reference voltage and the regulated voltage; a switch configured to transition between a first switch state in which the switch couples the control line to a turn-off voltage having a value to turn off the pass transistor and a second switch state in which the switch decouples the control line from the turn-off voltage; and a switch control circuit configured to maintain the switch in the first switch state during a first time interval while the input voltage ramps up and to transition the switch to the second switch state after the first time interval. | 03-31-2016 |
20160098049 | VOLTAGE GENERATING CIRCUIT - A voltage generating circuit includes: ( | 04-07-2016 |
20160098050 | VOLTAGE REGULATOR, APPLICATION-SPECIFIC INTEGRATED CIRCUIT AND METHOD FOR PROVIDING A LOAD WITH A REGULATED VOLTAGE - A voltage regulator for digital loads combines a closed loop regulation circuit with an open loop topology. A transistor and a bank of transistors share the same voltage source VDD and gate control current. Each of the bank of transistors is sized to match different current load requirements and one or more may be switched in or out as appropriate when the digital load transitions from one operating mode to another. The regulator has good DC load regulation and unconditional stability regardless of output capacitance. | 04-07-2016 |
20160103458 | CIRCUIT FOR REGULATING STARTUP AND OPERATION VOLTAGE OF AN ELECTRONIC DEVICE - An electronic device includes a power supply, a ground, and an intermediate ground having a voltage less than a voltage of the power supply and greater than a voltage of the ground. The electronic device also includes an error amplifier having an input stage coupled between the power supply and the ground, and an output stage coupled between the power supply and the intermediate ground. A ballast transistor is coupled to receive an output from the error amplifier. A feedback circuit is coupled to an output of the ballast transistor to generate feedback signals, and the error amplifier operates in response to the feedback signals. | 04-14-2016 |
20160116927 | VOLTAGE REGULATOR WITH SOFT-START CIRCUIT - A voltage regulator includes an operational amplifier, a transistor, a first resistor, a second resistor, an output voltage delaying circuit and a selecting circuit. The output voltage delaying circuit receives an output voltage and generates a delayed output voltage. A first input terminal of the selecting circuit receives a reference voltage. A second input terminal of the selecting circuit receives the delayed output voltage. An output terminal of the selecting circuit generates a control voltage to a first input terminal of the operational amplifier. If the reference voltage is larger than the delayed output voltage, the selecting circuit selects the delayed output voltage as the control voltage. If the reference voltage is smaller than the delayed output voltage, the selecting circuit selects the reference voltage as the control voltage. | 04-28-2016 |
20160116928 | USB POWER SUPPLY APPARATUS - A USB power supply apparatus supplies electric power to a USB power reception apparatus. A bus line connects the output of the power supply circuit and the USB power reception apparatus. A switch is provided on a path of the bus line. A feedback circuit feedback controls the power supply circuit such that the output voltage V | 04-28-2016 |
20160124446 | APPARATUS AND METHOD FOR MULTIPHASE SMPS INTERLEAVING - In described examples, a phase interleaver obtains (i) a first signal indicating a variance between a reference voltage and a regulated output voltage and (ii) a second signal indicating a voltage across an energy storage device. A voltage regulator includes multiple phase blocks collectively configured to generate the regulated output voltage. In a repeating cycle, (i) the voltage across the energy storage device is increased while the second signal is less than the first signal and (ii) in response to a determination that the second signal is greater than the first signal, the energy storage device is substantially discharged, multiple stages of a clock divider are transitioned in the phase interleaver, and a set of control signals is output from the clock divider. The control signals have a common switching frequency and a common switching period. The control signals control the phase blocks active in generating the output voltage. | 05-05-2016 |
20160124447 | Method to Pre-Set a Compensation Capacitor Voltage - Compensation capacitor voltages of DC-to-DC converters are pre-set without switching to enable smooth transition from sleep mode to active mode. Appropriate compensation capacitor voltages are set regardless of the length of no-switching sleep period or input voltage change. Therefore the converter can always start with appropriate error amplifier and duty conditions, and avoid output voltage disturbance when the PWM control loop takes over in active mode the control of buck converter. The appropriate capacitor voltages are enabled by creating a local PWM feedback loop of a PWM control loop without enabling the output stage. This local PWM feedback loop works intermittently and always sets the appropriate voltage for the error amplifier and compensation capacitor. | 05-05-2016 |
20160132064 | Load Transient , Reduced Bond Wires for Circuits Supplying Large Currents - Circuits and methods to improve dynamic load transient performance of circuits supplying high current and having parasitic resistances are disclosed. These circuits comprise e.g. LDOs, amplifiers or buffers. The circuits and methods are characterized by including parasitic resistances, caused by bond wires, metallization of pass devices, and substrate routings, in a loop for fast transient response. Furthermore the circuits comprise a stabilization circuit within said loop and a separate pad for said loop. | 05-12-2016 |
20160147239 | LINEAR REGULATOR HAVING A CLOSED LOOP FREQUENCY RESPONSE BASED ON A DECOUPLING CAPACITANCE - A method includes using a pass device of a linear regulator to provide an output signal to an output of the linear regulator in response to a signal that is received at a control terminal of the pass device. The method includes using the linear regulator to regulate the signal received at the control terminal based at least in part on the output signal; and controlling a closed loop frequency response of the linear regulator to cause a direct current (DC) gain of the linear regulator to extend to a frequency near or at frequency of a zero that is associated with a decoupling capacitor that is coupled to the output of the linear regulator. | 05-26-2016 |
20160147240 | LOW DROPOUT REGULATOR - A low dropout regulator and system for supplying power to a card are provided. A low dropout regulator includes a reference voltage supply circuit configured to output a reference voltage based on an input supply voltage. An error amplifier has a first input, a second input, and a single-ended output. The first input is coupled to the reference voltage, and the second input is coupled to an output node of the low dropout regulator via a first feedback resistor. A pass transistor includes a control electrode connected to the single-ended output of the error amplifier, a first electrode connected to a ground node, and a second electrode connected to the output node of the low dropout regulator. A first power supply terminal of the error amplifier is connected to the output node, and the output node provides an output voltage of the low dropout regulator that powers the error amplifier. | 05-26-2016 |
20160154415 | DUAL MODE LOW-DROPOUT LINEAR REGULATOR | 06-02-2016 |
20160161961 | CIRCUIT TO IMPROVE LOAD TRANSIENT BEHAVIOR OF VOLTAGE REGULATORS AND LOAD SWITCHES - A method to adjust the load transient regulation of a low drop-out (LDO)/load switch linear voltage regulator (LVR) with an n-type pass element having an open loop transfer function, including determining during a load transient event if the gate of the pass—element goes lower than a scaled value of the output voltage or a constant voltage level, generating a control signal that controls a current sink block if the gate voltage of the pass element is lower than the output voltage, and enabling a current sink block that is controlled by the control signal and connecting the output of the current sink block to the output of the LVR. | 06-09-2016 |
20160170425 | POWER CONTROL CIRCUIT | 06-16-2016 |
20160179115 | Sink/Source Output Stage with Operating Point Current Control Circuit for Fast Transient Loading | 06-23-2016 |
20160187902 | TWO-STAGE ERROR AMPLIFIER WITH NESTED-COMPENSATION FOR LDO WITHSINK AND SOURCE ABILITY - A low dropout amplifier may include an error amplifier having first and second inputs coupled to a reference signal and a feedback signal, respectively. The error amplifier may be configured to generate first and second error signals at first and second outputs, respectively, with the first and second error signals based upon a difference between the reference signal and the feedback signal. A sink stage may be coupled to the first output and configured to generate a sink current based upon the first error signal. A source stage may be coupled to the second output and configured to generate a source current based upon the second error signal. An output node may be coupled to receive the sink and source currents. | 06-30-2016 |
20160187903 | N-CHANNEL INPUT PAIR VOLTAGE REGULATOR WITH SOFT START AND CURRENT LIMITATION CIRCUITRY - A voltage regulator includes two input pairs of opposite type transistors, p-type and n-type, to provide a soft-start functionality for gradually increasing the voltage regulator's output voltage from zero, or a voltage below the thresholds of the n-type transistors, to an operational voltage. The voltage regulator operates in a soft-start mode during which a variable input voltage signal is ramped up to allow the output voltage to reach the operational voltage, and a normal-operation mode during which the operational voltage is maintained. | 06-30-2016 |
20160187904 | Low Power Ideal Diode Control Circuit - A circuit that operates as a low-power ideal diode is disclosed, as well as an IC chip that contains the ideal diode circuit. The circuit includes a first P-channel transistor connected to receive an input voltage on a first terminal and to provide an output voltage on a second terminal, a first amplifier connected to receive the input voltage and the output voltage and to provide a first signal that dynamically biases a gate of the first P-channel transistor as a function of the voltage across the first P-channel transistor, and a second amplifier connected to receive the input voltage and the output voltage and to provide a second signal that acts to turn off the gate of the first P-channel transistor responsive to the input voltage being less than the output voltage. | 06-30-2016 |
20160187905 | CIRCUIT FOR GENERATING STEPPED-DOWN VOLTAGE - A circuit includes a PMOS transistor having a source coupled to an input node and a drain coupled to an output node, a control circuit operating with a voltage of an internal line to control a gate voltage of the PMOS transistor, a comparator operating with the voltage of the internal line to cause a comparator output to change from a first state to a second state in response to a drop of voltage of the input node, a switch circuit configured to connect the input node to the internal line when the comparator output is in the first state, and to connect the output node to the internal line when the comparator output is in the second state, and a block circuit configured to block a path from the output node to the input node through the PMOS transistor when the comparator output is in the second state. | 06-30-2016 |
20160195883 | POWER SUPPLY REJECTION FOR VOLTAGE REGULATORS USING A PASSIVE FEED-FORWARD NETWORK | 07-07-2016 |
20160195884 | Circuits and Method for Controlling Transient Fault Conditions in a Low Dropout Voltage Regulator | 07-07-2016 |
20160202715 | LOW-NOISE SAMPLED VOLTAGE REGULATOR | 07-14-2016 |
20160252919 | POWER SUPPLY CIRCUIT | 09-01-2016 |
20170235321 | LOW POWER STANDBY MODE FOR BUCK REGULATOR | 08-17-2017 |
20180024580 | Low-Dropout Regulator with Pole-Zero Tracking Frequency Compensation | 01-25-2018 |
20220137656 | LDO with Self-Calibrating Compensation of Resonance Effects - Low drop-out (LDO) regulator circuits and methods that can operate at high frequencies without the adverse consequences of an oscillatory resonance effect from a capacitive load. In a first embodiment, a low pass filter (LPF) is coupled to the LDO and tuned to cancel the oscillatory resonance effect. In a second embodiment, the LPF is a second-order LPF and/or programmable. Since the tuning values of the programmable LPF may be programmatically selected, a much greater range of external capacitors values (with attendant ESR and ESL values), as well as a wider range of system parasitic capacitances, can be accommodated while maintaining system stability. Some variants of the second embodiment include an oscillation detector and filter bit control circuit that allows the tuning values of the programmable LPF to be dynamically determined and re-determined. An impedance-lowering device may be coupled to lower the impedance of the connection to the LPF. | 05-05-2022 |