Patent ID: 8237232

Claim:
A semiconductor device for a power supply circuit, comprising: a first die pad having a top surface and a bottom surface opposite each other, and a first lead for an input of the power supply circuit; a second die pad having a top surface and a bottom surface opposite each other, and a second lead for an output of the power supply circuit; a third die pad having a top surface and a bottom surface opposite each other, and a third lead; fourth leads for ground potential of the power supply circuit; a first semiconductor chip disposed over the top surface of the first die pad and including: a first MOSFET having: a first gate electrode pad, a first source electrode pad, and a first drain electrode coupled to the first die pad; a second semiconductor chip disposed over the top surface of the second die pad and including: a second MOSFET having: a second gate electrode pad, a second source electrode pad, and a second drain electrode coupled to the second die pad, and wherein the second semiconductor chip has a rectangular shape in plan view, with a pair of long sides and a pair of short sides; a third semiconductor chip disposed over the top surface of the third die pad and including: a first driver circuit having an output coupled to the first gate electrode pad of the first MOSFET, and a second driver circuit having an output coupled to the second gate electrode pad of the second MOSFET; a resin body covering the first, second, and third semiconductor chips and having: a pair of first side surfaces opposite each other, a pair of second side surfaces opposite each other, and a top surface and a bottom surface opposite each other, the top and bottom surfaces thereof intersecting the first and second pairs of side surfaces thereof, the bottom surfaces of the first, second and third die pads being exposed from the bottom surface of the resin body, wherein one of the fourth leads is exposed from one of the pair of the first side surfaces of the resin body, and another one of the fourth leads is exposed from one of the pair of the second side surfaces of the resin body, a first metal plate coupled between the first source electrode pad of the first MOSFET and the second die pad; and a second metal plate coupled between the second source electrode pad of the second MOSFET and the fourth leads and having: a first portion disposed over the second source electrode pad of the second semiconductor chip, a second portion disposed so as to overlap one of the short sides of the second semiconductor chip in plan view and electrically and mechanically coupled to the one of the fourth leads, and a third portion disposed so as to overlap one of the long sides of the second semiconductor chip in plan view and electrically and mechanically couple to the another one of the fourth leads.