Patent ID: 8680828

Claim:
A voltage regulator comprising: a reference voltage circuit for outputting a reference voltage; an output transistor; a first differential amplifier circuit for amplifying and outputting a difference between the reference voltage and a divided voltage obtained by dividing voltage output from the output transistor to control a gate of the output transistor; a booster circuit for detecting output current from the output transistor and outputting a signal to the first differential amplifier circuit, wherein the booster circuit performs control operations to increase a bias current flowing through the first differential amplifier circuit according to an output current from the output transistor, and increases a response time of the first differential amplifier circuit; a sensing transistor having a gate connected to an output of the first differential amplifier for sensing the output current; a first transistor having a source connected to a drain of the sensing transistor and to the booster circuit for making an adjustment to enable the output current to be copied accurately by the sensing transistor; and a second differential amplifier circuit in which an output terminal is connected to a gate of the first transistor, an inverting input terminal is connected to the drain of the sensing transistor, and a non-inverting input terminal is connected to an output terminal of the voltage regulator.