REGULATOR CIRCUIT

A regulator circuit includes an operational amplifier that generates a differential voltage representing a difference between a voltage obtained by dividing an output voltage and a reference voltage. The regulator circuit further includes a first current path that allows through a first current corresponding to the differential voltage, a current mirror circuit that is connected to the first current path and that sends to an output terminal an output current that is a copy of the first current, and an overcurrent protection circuit that limits a current value of the output current to a prescribed value or lower. The overcurrent protection circuit includes a first transistor that is connected to the first current path and that receives a current corresponding to the prescribed value as an upper limit current at a gate thereof while applying the first current between source and drain thereof.