Patent ID: 8148960

Claim:
A voltage regulator circuit comprising: a differential amplifier circuit, a reference voltage is supplied to a first input of the differential amplifier circuit, and a smoothing capacitor is connected to an output of the differential amplifier circuit; a first resistor element whose one end is connected to the output of the differential amplifier circuit; a second resistor element whose one end is connected to another end of the first resistor element; a first switch, one end of the first switch is connected to the first input of the differential amplifier circuit, another end of the first switch is connected to a second input of the differential amplifier circuit, and the first switch is configured to be turned on in response to a first control signal; a second switch, an end of the second switch is connected to the second input of the differential amplifier circuit, another end of the second switch is connected to the second resistor element, and the second switch is turned on in response to a second control signal; and a switch control circuit configured to output the first control signal in a predetermined period from a power supply is turned on, and to output the second control signal after the predetermined period.