Patent ID: 8063620

Claim:
A semiconductor device for a switching regulator and for use with a capacitor, the semiconductor device comprising: an input voltage terminal; an output terminal; a ground potential terminal; a power terminal; a first semiconductor chip including a first MOSFET having a source-drain path coupled between the input voltage terminal and the output terminal and a gate; a second semiconductor chip including a second MOSFET having a source-drain path coupled between the output terminal and the ground potential terminal and a gate; and a third semiconductor chip 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, the third semiconductor chip comprising a P-channel switch MOSFET having a source-drain path coupled between the power terminal and the output terminal via the capacitor, wherein the switch MOSFET is in a conductive state when the second MOSFET is in the conductive state and is in a non-conductive state when the second MOSFET is in a non-conductive state, wherein the switch MOSFET has a source region of a P-type and a drain region of the P-type and is formed in an N-type region and includes a parasitic diode between the drain region and the N-type region, the parasitic diode being in a reverse bias state when the second MOSFET is in the non-conductive state, and wherein the first semiconductor chip, the second semiconductor chip and the third semiconductor chip are disposed in a package.