OVERCURRENT PROTECTION CIRCUIT, SEMICONDUCTOR DEVICE AND VOLTAGE REGULATOR

摘要

To provide an overcurrent protection circuit which prevents an excessive current from flowing to an output terminal for a long time, and a semiconductor device and a voltage regulator each equipped with the overcurrent protection circuit. An overcurrent protection circuit is configured to include a first transistor which allows a current proportional to an output current flowing through an output transistor to flow, a constant current circuit which allows a reference current to flow, a comparison circuit which compares the current flowing through the first transistor and the reference current, and a control circuit which controls a gate of the output transistor by a signal outputted from the comparison circuit.

主权项

1. An overcurrent protection circuit, comprising:
a first transistor which allows a current proportional to an output current flowing through an output transistor to flow; a constant current circuit which allows a reference current to flow; a comparison circuit which compares the current flowing through the first transistor and the reference current; and a control circuit which controls a gate of the output transistor by a signal outputted from the comparison circuit.