Patent ID: 7746163

Claim:
A stabilized DC power supply circuit, characterized in having, between first and second electrode terminals, which introduce power supply voltage, a reference voltage generating circuit, which generates a reference voltage; a voltage dividing circuit, which generates another reference voltage; a differential amplifier, which amplifies the voltage difference between the reference voltages; a voltage current output circuit, which is controlled by the differential amplifier in order to produce a stabilized output voltage; an output voltage dividing circuit, which detects output voltage changes; and a bias current boost circuit, which is controlled by the load current flowing from the voltage current output circuit and is connected to the differential amplifier, wherein the bias current boost circuit comprises an inverse amplification circuit exhibiting hysteresis; a first bias current generating circuit, which always supplies constant current; and a second bias current generating circuit, which is controlled by the inverse amplification circuit exhibiting hysteresis, and is designed such that the load current under which the second bias current generating circuit switches to the non-conducting state is lower than the load current under which the second bias current generating circuit is in the conducting state.