Patent ID: 9552008
Date: 2017-01-24
CPC Classifications: G05F

Claim:
1. A voltage regulator circuit that outputs an output voltage that corresponds to a reference voltage, the voltage regulator circuit comprising: an output transistor that has first, second, and third electrodes and controls the output voltage by making an output current flow between the first electrode and the second electrode according to a first differential voltage, the first differential voltage being a difference between a voltage at the first electrode and a voltage at the third electrode; an operational amplifier that controls the voltage at the third electrode such that the output voltage reaches a target level; an initiation circuit that maintains the voltage such that the output transistor is off before initiation of the voltage regulator circuit and that allows the second voltage to be controlled by the operational amplifier after initiation of the voltage regulator circuit; and a current output circuit that outputs an adjustment current from the third electrode or to the third electrode such that the first differential voltage becomes larger when the output voltage is less than a predetermined level.