Load driving device and electronic device using same

摘要

A load driving device according to the present invention has: an internal circuit (DRV) that operates in response to the supply of a power supply voltage (HV or LV); an output circuit (PD1 and PD2) for driving a load in response to the supply of the power supply voltage (HV or LV); an abnormality detection circuit (12) for monitoring the power supply voltage (HV or LV) and generating an abnormality detection signal (S1); and a power supply switch (P0) for, according to the abnormality detection signal (S1), conducting or cutting off a power-supply-voltage supply line to the internal circuit (DRV).

主权项

1. A load driving device comprising:
an internal circuit which operates by being fed with a supply voltage; an output circuit which drives a load by being fed with the supply voltage; a fault detection circuit which monitors the supply voltage to generate a fault detection signal; a power switch which connects/disconnects a supply voltage feed line leading to the internal circuit according to the fault detection signal, and wherein the output circuit includes a p-type transistor connected between a supply voltage node and an output node; a first upper switch which connects/disconnects between a gate of the upper transistor and the supply voltage node according to the fault detection signal; and a second upper switch which connects/disconnects between the gate of the upper transistor and the driving circuit according to the fault detection signal, wherein the internal circuit includes a driving circuit which feeds a driving signal to the output circuit.