Patent ID: 7342384

Claim:
A switching regulator, comprising: a voltage-dividing resistor for dividing a voltage outputted to an output terminal; an error amplifier for comparing a voltage outputted by the voltage-dividing resistor with a reference voltage; a chopping wave generator circuit for generating a chopping wave; a control circuit for inputting an output of the error amplifier and the chopping wave; a p-type MOS transistor and an n-type MOS transistor controlled according to an output of the control circuit and connected in series between a power supply and a ground; and a bypass transistor connected between the power supply and the output terminal, wherein a circuit for generating the reference voltage comprises: a first reference voltage circuit; a first switching means for connecting the first reference voltage circuit to the error amplifier in inversion synchronism with the bypass transistor; a time constant circuit disposed between the first switch means and the error amplifier; a second reference voltage circuit; and a second switch means for connecting the second reference voltage circuit to the error amplifier in synchronism with the bypass transistor.