Patent ID: 8482345

Claim:
A semiconductor device including a DC-DC converter, comprising: a first die pad including an input power supply terminal; a second die pad including an output terminal; a third die pad; a wiring section including a reference potential terminal; a first semiconductor chip, which includes a high side MOSFET of the DC-DC converter and includes a first gate electrode pad, a first source electrode pad and a first drain electrode of the high side MOSFET, the first drain electrode being electrically connected to the first die pad; a second semiconductor chip, which includes a low side MOSFET of the DC-DC converter and includes a second gate electrode pad, a second source electrode pad and a second drain electrode of the low side MOSFET, the second drain electrode being electrically connected to the second die pad; a third semiconductor chip disposed over the third die pad, which includes a first driver circuit configured for driving the high side MOSFET and a second driver circuit configured for driving the low side MOSFET, and includes a first electrode pad electrically connected to an output of the first driver circuit and a second electrode pad electrically connected to an output of the second driver circuit, the first electrode pad of the third semiconductor chip being electrically connected to the first gate electrode pad of the first semiconductor chip by a first bonding wire, the second electrode pad of the third semiconductor chip being electrically connected to the second gate electrode pad of the second semiconductor chip by a second bonding wire; a first metal plate wiring electrically connected to the first source electrode pad of the first semiconductor chip and the second die pad; a second metal plate wiring electrically connected to the second source electrode pad of the second semiconductor chip and the wiring section: a Schottky Barrier Diode, including an anode and a cathode electrically connected to the second source electrode pad and the second drain electrode of the second semiconductor chip, respectively; and a resin body covering the first, second, third semiconductor chips and the Schottky Barrier Diode.