| Patent application number | Description | Published |
|---|
| 20080265852 | VOLTAGE REGULATOR - Provided is a voltage regulator having an overcurrent protective circuit, which is excellent in detection precision and small in current consumption. The voltage regulator having the overcurrent protective circuit which detects that overcurrent flows in an output transistor, and limits the current of the output transistor, includes a regulated cascode circuit that makes a voltage at a source of the output transistor equal to a voltage at a source of the output current detection transistor, in which the operating current of the regulated cascode circuit is supplied by a transistor that is controlled by the output voltage of an error amplifier circuit. | 10-30-2008 |
| 20090021231 | Voltage regulator - Provided is a voltage regulator having satisfactory transient response characteristics. Because a PMOS ( | 01-22-2009 |
| 20090045870 | Reference voltage circuit - Provided is a reference voltage circuit whose power supply rejection ratio is large even in a case where a power supply voltage is low. Even in a case where the power supply voltage of a power supply terminal ( | 02-19-2009 |
| 20090121690 | Voltage regulator - Provided is a voltage regulator that is excellent in transient response characteristics even if a resistance of a resistor in a phase compensation circuit is large. In the voltage regulator, the resistor of the phase compensation circuit is so configured as to change the resistance thereof according to a voltage across both ends of the resistor. In a transient state in which an output voltage of an error amplifier circuit changes, the resistance of the resistor in the phase compensation circuit is decreased, to thereby improve the transient response characteristics of the voltage regulator. | 05-14-2009 |
| 20090206807 | Voltage regulator - Provided is a voltage regulator including an overcurrent protection circuit, which is capable of enhancing accuracy of a limit current value and a short-circuit current value, and suppressing electric power loss when an overcurrent flows through an output transistor. The overcurrent protection circuit includes: an output current detection transistor controlled by an output voltage of an error amplifier circuit, for feeding a detection current; a detection resistor for generating a detection voltage based on the detection current; a second error amplifier circuit for amplifying a difference between a voltage set by a second reference voltage and a divided voltage, and the voltage of the detection resistor, and outputting the amplified difference; and an output current limiting circuit in which a gate thereof is controlled by an output of the second error amplifier circuit, for controlling a gate voltage of the output transistor. Further, the second reference voltage is supplied from a temperature detection circuit. | 08-20-2009 |
| 20090289686 | VOLTAGE LEVEL SHIFT CIRCUIT AND SEMICONDUCTOR INTEGRATED CIRCUIT - Provided is a voltage level shift circuit including: a first voltage level shift circuit formed of a P-channel enhancement type transistor (M | 11-26-2009 |
| 20090295345 | Voltage regulator - Provided is a voltage regulator which can achieve high-speed response and is not susceptible to a ripple. An amplifier ( | 12-03-2009 |
| 20090302811 | Voltage regulator - Provided is a voltage regulator capable of performing appropriate phase compensation. Even when a difference between an input voltage and an output voltage is small, an appropriate phase compensation voltage based on an output voltage (Vout) is generated in a resistor circuit ( | 12-10-2009 |
| 20100156373 | Voltage regulator - Provided is a voltage regulator capable of performing a stable circuit operation while improving undershoot characteristics thereof. When an undershoot has occurred in an output voltage (VOUT), an undershoot improvement circuit ( | 06-24-2010 |
| 20100156386 | REFERENCE VOLTAGE CIRCUIT - Provided is a reference voltage circuit capable of generating a temperature-independent reference voltage more stably. Each of N-type metal oxide semiconductor (NMOS) transistors ( | 06-24-2010 |
| 20100201331 | Voltage regulator - To provide a voltage regulator having improved response characteristics in case of overshoot. The voltage regulator includes: a transistor ( | 08-12-2010 |
| 20100207591 | VOLTAGE REGULATOR - To provide a voltage regulator having low current consumption. | 08-19-2010 |
| 20100321845 | OVERHEAT PROTECTION CIRCUIT AND POWER SUPPLY INTEGRATED CIRCUIT - Provided is a power supply integrated circuit including an overheat protection circuit with high detection accuracy. The overheat protection circuit includes: a current generation circuit including: a first metal oxide semiconductor (MOS) transistor including a gate terminal and a drain terminal that are connected to each other, the first MOS transistor operating in a weak inversion region; a second MOS transistor including a gate terminal connected to the gate terminal of the first MOS transistor, the second MOS transistor having the same conductivity type as the first MOS transistor and operating in a weak inversion region; and a first resistive element connected to a source terminal of the second MOS transistor; and a comparator for comparing a reference voltage having positive temperature characteristics and a temperature voltage having negative temperature characteristics, which are obtained based on a current generated by the current generation circuit. | 12-23-2010 |
| 20110018520 | REFERENCE VOLTAGE CIRCUIT AND ELECTRONIC DEVICE - In order to realize a reference voltage circuit that operates with lower current consumption while maintaining an operation at lower voltage without causing deterioration of a power supply rejection ratio, provided is a reference voltage circuit in which a depletion transistor of an ED type reference voltage circuit is constituted of a plurality of depletion transistors connected in series, and in which a gate terminal of a cascode depletion transistor is connected to a connection point between the depletion transistors of the ED type reference voltage circuit. | 01-27-2011 |
| 20110074370 | VOLTAGE REGULATOR - Provided is a voltage regulator capable of setting an accurate short-circuit current. Used as a circuit for determining a current value of a short-circuit current of an overcurrent protection circuit is not a resistor for converting current into voltage but a circuit for controlling in the form of current, that is, a circuit of an N-channel depletion type transistor including a gate and a drain that are connected to each other and operating in a non-saturated state. The N-channel depletion type transistor has process fluctuations that are linked with those of a detection transistor, and hence an accurate short-circuit current may be set without trimming. | 03-31-2011 |
| 20110074496 | REFERENCE VOLTAGE CIRCUIT - Provided is a reference voltage circuit in which a temperature characteristic of a reference voltage is excellent and a circuit scale is small. In the reference voltage circuit, for example, a temperature correction circuit separated from the reference voltage circuit is not used and a difference voltage between threshold voltages of two E-type NMOS transistors ( | 03-31-2011 |
| 20110074508 | VOLTAGE REGULATOR - Provided is a voltage regulator having a structure in which an output terminal of a first differential amplifier circuit is connected to a second differential amplifier circuit to control an output transistor by the second differential amplifier circuit. When low current consumption is required, the first differential amplifier circuit is suspended. When high-speed response is required, the first differential amplifier circuit is activated. The low-current consumption operation and the high-speed operation are switched with a minimum circuit area. | 03-31-2011 |
