A disclosed step-up/step-down switching regulator includes 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 voltage proportional to the voltage output
from the step-up/step-down part and a predetermined reference voltage.
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.