Patent ID: 7560911

Claim:
A step-up/step-down switching regulator comprising: a step-up/step-down part using an inductor for stepping up or stepping down an input voltage from an input terminal and outputting the stepped-up/stepped-down voltage from an output terminal according to a control signal; and a control part for controlling the stepping-up/stepping-down by the step-up/step-down part according to a voltage difference between a proportional voltage proportional to the voltage output from the step-up/step-down part and a predetermined reference voltage; wherein the control part includes an error amplifier circuit part for amplifying the voltage difference between the proportional voltage and the reference voltage and outputting the amplified voltage, an inverting amplifier circuit part for performing inverting amplification on the voltage output from the error amplifier circuit and outputting the inverted voltage, and an output control part for performing a step-down operation on the step-up/step-down part according to the voltage output from the error amplifier circuit part and performing a step-up operation on the step-up/step-down part according to the voltage output from the inverting amplifier circuit part.