Power supply control device

Abstract

A power supply control device includes: a first transistor that is connected between an input terminal and an output terminal and that controls a current supplied from the input terminal to the output terminal; a regulator control circuit that detects a voltage of the output terminal and controls the first transistor so that the voltage of the output terminal is at a constant level; a reverse-current detection circuit that detects a reverse current state between the input terminal and the output terminal; a logic circuit that receives a detection result signal from the reverse-current detection circuit; and a bias circuit that generates a bias current that operates the regulator control circuit. The logic circuit supplies the bias circuit with a potential that turns on or off generation of the bias current by the bias circuit, based on the detection result signal from the reverse-current detection circuit.

Dependencies are inferred from the claim text.