Patent ID: 8405321

Claim:
A switching regulator that turns on and off an input voltage to thereby convert the input voltage into a desired output voltage and feeds the output voltage to a load, comprising: a switching device that turns on and off the input voltage; a control IC that controls the switching device between on and off states by using a PWM signal; a smoothing capacitor that smooths an output of the switching device to produce the output voltage fed to the load; and a semiconductor substrate on which the switching device, the control IC, and the smoothing capacitor are disposed, wherein the smoothing capacitor comprises two smoothing capacitors which are electrically connected in parallel with each other between an output end of the switching device and ground, the two smoothing capacitors are physically disposed parallel to each other on a same face of the semiconductor substrate; the drive frequency of the PWM signal is from 20 Hz to 20 kHz; and a GND conductor is singly connected to one end of the smoothing capacitor.