Patent application number | Description | Published |
20080224680 | Voltage regulator - To enhance a safety of a voltage regulator, provided is a control circuit ( | 09-18-2008 |
20090184748 | Voltage regulator - Provided is a voltage regulator for limiting a rush current from an output stage transistor. The voltage regulator includes an output current limiting circuit having a low detection current value and an output current limiting circuit having a high detection current value, and is structured so as to enable operation of the output current limiting circuit having a low detection current value during a time period from a state in which an overheat protection circuit detects overheat and an output current is stopped to a state in which an overheat protection is canceled and a predetermined time passes. Accordingly, after the overheat protection is cancelled, an excessive rush current can be limited. | 07-23-2009 |
20090189584 | VOLTAGE REGULATOR - Provided is a voltage regulator capable of reducing fluctuation of an output current even when an output terminal thereof is short-circuited. In a case where the output terminal of the voltage regulator is short-circuited, an output current (Iout) of the voltage regulator is limited and fixed to a limit current value. When an output voltage (Vout) of the voltage regulator decreases to have a value equal to or smaller than not a detection voltage value (Vref | 07-30-2009 |
20110032776 | MEMORY CIRCUIT AND VOLTAGE DETECTION CIRCUIT INCLUDING THE SAME - Provided are a memory circuit having a small circuit scale and a voltage detection circuit including the memory circuit. An NMOS transistor ( | 02-10-2011 |
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 |
20110234298 | REFERENCE VOLTAGE CIRCUIT - Provided is a reference voltage circuit having a soft start function, which is small in circuit size and is capable of providing a continuous voltage. The reference voltage circuit includes a reference voltage section and a soft start circuit. The reference voltage section includes a depletion mode MOS transistor and a first enhancement mode MOS transistor. The soft start circuit includes: a second enhancement mode MOS transistor having a gate connected to a gate and a drain of the first enhancement mode MOS transistor, and a drain connected to an output terminal of the reference voltage circuit; a MOS switch having one terminal connected to an output terminal of the reference voltage section, and another terminal connected to the drain of the second enhancement mode MOS transistor; and a constant current source and a capacitor connected in series between a power supply and a ground. | 09-29-2011 |
20130193939 | VOLTAGE REGULATOR - Provided is a variable output voltage regulator capable of reducing heat generation during an overcurrent protection operation even when a setting value of an output voltage is high. The variable output voltage regulator can change an output voltage by trimming a resistor of a voltage dividing circuit in response to a trimming signal output from a trimming signal generation circuit. The trimming signal is used to change a limiting voltage of a fold-back type overcurrent protection circuit. | 08-01-2013 |
20150097543 | VOLTAGE REGULATOR - Provided is a voltage regulator including a leakage current correction circuit capable of keeping the accuracy of an output voltage of the voltage regulator even when an output voltage of a reference voltage circuit is decreased due to the influence of a leakage current. The voltage regulator includes: a reference voltage circuit configured to output a reference voltage; an output transistor configured to output an output voltage; a voltage divider circuit configured to divide the output voltage to output a feedback voltage; an error amplifier circuit configured to amplify a difference between the reference voltage and the feedback voltage, and output the amplified difference to control a gate of the output transistor; and a leakage current correction circuit connected to an output terminal of the voltage divider circuit. The leakage current correction circuit is configured to decrease the feedback voltage to prevent the output voltage from dropping at high temperature. | 04-09-2015 |
20150108953 | VOLTAGE REGULATOR - Provided is a voltage regulator including a leakage current sink circuit capable of suppressing an influence of a leakage current of an output transistor at high temperature, and reducing power consumption of the voltage regulator at normal temperature. The voltage regulator includes: a reference voltage circuit configured to output a reference voltage; an output transistor configured to output an output voltage; a voltage divider circuit configured to divide the output voltage to output a feedback voltage; an error amplifier circuit configured to amplify a difference between the reference voltage and the feedback voltage, and output the amplified difference to control a gate of the output transistor; and a leakage current sink circuit connected to an output terminal and configured to be prevented from operating at normal temperature, and suppress an influence of a leakage current from the output transistor only at high temperature. | 04-23-2015 |
20150277458 | VOLTAGE REGULATOR - To provide a voltage regulator capable of maintaining the accuracy of an output voltage even if it is set to an arbitrary output voltage. A voltage regulator includes an output transistor comprised of an NMOS transistor having a backgate grounded, an error amplifier circuit configured to amplify and output a difference between a divided voltage obtained by dividing an output voltage outputted from the output transistor and a reference voltage and thereby to control a gate of the output transistor, a constant voltage circuit, and a transistor having a gate inputted with a voltage of the constant voltage circuit, a drain connected to the gate of the output transistor, and a source connected to a source of the output transistor. | 10-01-2015 |