Patent ID: 8232783
Filing Date: 2012-07-31
Classification: G05F

Abstract:
1. A constant-voltage power supply circuit comprising: an error amplifier in which a bias current flows due to a bias voltage, the error amplifier amplifying a difference between a reference voltage and a first voltage corresponding to an output voltage outputted from an output terminal; an output transistor connected between said output terminal and a power supply node and controlled by an output of said error amplifier to control said output voltage to be constant; a load current monitor that monitors a load current flowing through said output transistor and increases said bias current responsive to said load current; a gain adjustor that monitors said load current and decreases a gain of said error amplifier responsive to said load current; and a current limiting resistor provided in said load current monitor and that limits a consumption current of at least one of said load current monitor and said bias current during at least one of startup and when overloaded.