Patent ID: 8373494
Filing Date: 2013-02-12
Classification: H01L,H03K

Abstract:
1. A power supply control circuit comprising: an output transistor of an N-channel type provided between a power supply line and an output terminal; a gate driving circuit generating a control signal for controlling on/off of the output transistor based on an external input signal; a first discharge switch provided between a gate and a source of the output transistor and, when turning off the output transistor, operable to discharge a charge stored in the gate of the output transistor based on the control signal; a second discharge switch provided between the gate and the source of the output transistor and, when turning off the output transistor, operable to discharge a charge stored in the gate of the output transistor more slowly than the first discharge switch based on the control signal; and a discharge cutoff circuit coupled to the first discharge switch in series and, in the case of turning off the output transistor, operable to cut off discharging a charge stored in the gate of the output transistor, when a gate voltage of the output transistor falls to a prescribed voltage level which is larger than the sum of a voltage of the power supply line and a threshold voltage of the output transistor.