Micro power supply device using switching element

摘要

A micro power supply device using a switching element includes a lateral MOSFET, an inductor, a rectifier and a controller. The lateral MOSFET PWM-switches the output voltage of the direct-current power supply at a low loss. The rectifier rectifies the output voltage of the direct-current power supply PWM-switched by the lateral MOSFET. The inductor is provided between the direct-current power supply and the lateral MOSFET. The controller supplies a PWM control signal to the gate electrode of the lateral MOSFET in response to the output voltage of the rectifier.