VOLTAGE REGULATOR

摘要

Provided is a voltage regulator configured to suppress a fluctuation in output voltage even when a power supply voltage fluctuates, thereby realizing stable operation thereof. The voltage regulator includes a control circuit including a first input terminal connected to a drain of an output transistor, a second input terminal connected to a power supply terminal, an overshoot detection circuit connected to the first input terminal, and a power supply voltage detection circuit connected to the second input terminal, and being configured to cause a boost current to flow through an error amplifier circuit when an output voltage and a power supply voltage largely fluctuate with respect to a predetermined voltage.

主权项

1. A voltage regulator configured to stabilize a power supply voltage input from a power supply terminal to output the stabilized power supply voltage, the voltage regulator comprising:
an error amplifier circuit configured to amplify a difference between a reference voltage and a divided voltage obtained by dividing an output voltage output from an output transistor to output the amplified difference, to thereby control a gate of the output transistor; and a control circuit comprising a first input terminal connected to a drain of the output transistor, a second input terminal connected to the power supply terminal, an overshoot detection circuit connected to the first input terminal, and a power supply voltage detection circuit connected to the second input terminal, and being configured to cause a boost current to flow through the error amplifier circuit when the output voltage and the power supply voltage largely fluctuate with respect to a predetermined voltage.