Switching power supply device and a semiconductor integrated circuit

A regulator comprising:

• an inductor having a first end and a second end;
• an output capacitor coupled to the second end of the inductor;
• a boost capacitor;
• and
• a semiconductor device comprising:
• an input voltage terminal;
• an output terminal coupled to the first end of the inductor;
• a ground potential terminal;
• a power terminal;
• a first terminal coupled to the output terminal via the boost capacitor;
• a first MOSFET having a source-drain path coupled between the input voltage terminal and the output terminal and a gate;
• a second MOSFET having a source-drain path coupled between the output terminal and the ground potential terminal and a gate;
• a control circuit coupled to the power terminal, coupled to provide a first control signal to the gate of the first MOSFET and coupled to provide a second control signal to the gate of the second MOSFET;
• and
• a P-channel switch MOSFET having a source-drain path coupled between the power terminal and the first terminal, a source thereof being coupled to a back gate thereof and to the first terminal, and a drain thereof being coupled to the power terminal.