Semiconductor integrated circuit device and power supply system

A semiconductor integrated circuit device comprising:

• a first voltage terminal supplied with a first voltage;
• an output terminal;
• a first MOSFET having a first input electrode, a drain, a source, and a second input electrode located closer to the drain than the first input electrode, the first MOSFET being connected between the first voltage terminal and the output terminal and electrically connecting the first voltage terminal to the output terminal according to a first input signal supplied to the first input electrode;
• a drive circuit connected to the first input electrode of the first MOSFET, the drive circuit generating the first input signal so that the first MOSFET is switched on and off;
• a detecting circuit that detects a current flowing through the output terminal to determine whether a value of the current exceeds a given current value;
• and
• a control circuit connected to the detecting circuit, and to the second input electrode of the first MOSFET, the control circuit supplying a voltage to the second input electrode of the first MOSFET, the voltage taking different values according to whether a current flowing through the output terminal exceeds the given current value or not.