Patent ID: 8289669
Filing Date: 2012-10-16
Classification: H03K

Abstract:
1. A semiconductor device, comprising: an output transistor which controls a power supply to a load according to a control voltage applied to a gate thereof; a voltage control circuit coupled between the gate and a drain of the output transistor, the voltage control circuit having a conduction state controlled according to a potential difference between a source and the drain of the output transistor; a voltage control detection circuit which outputs a voltage control detection signal on a basis of the conduction state of the voltage control circuit; a first discharge switch comprising a conductive path that is configured to be connected between the gate and the source of the output transistor, an on-off state of the first discharge switch being controlled according to the voltage control detection signal; a second discharge switch comprising a conductive path that is configured to be series-connected to the first discharge switch between the gate and the source of the output transistor, an on-off state of the second discharge switch being controlled according to a temperature condition of the output transistor; and a third discharge switch comprising a conductive path that is configured to be connected between the gate and the source of the output transistor.