Patent ID: 8064235

Claim:
A semiconductor device for use in a DC-DC converter, comprising: a first semiconductor chip including a high-side MOSFET of the DC-DC converter, the high-side MOSFET including a source, a gate and a drain; a second semiconductor chip including a low-side MOSFET of the DC-DC converter, the low-side MOSFET including a source, a gate and a drain; a third semiconductor chip including a driver circuit for driving a gate of the high- side MOSFET and a gate of the low-side MOSFET; an input power supply terminal configured for supplying an input power to the DC-DC converter; a reference potential supply terminal configured for supplying a reference potential to the DC-DC converter; an output terminal configured for outputting an output of the DC-DC converter; an input capacitor coupled to the input power supply terminal and the reference potential supply terminal; and a resin encapsulator encapsulating the first, second and third semiconductor chips and the input capacitor, wherein the input capacitor is disposed over the first semiconductor chip and the second semiconductor chip.