Patent ID: 9412701
Filing Date: 2016-08-09
CPC Classification: H01L,H02M,H05K,Y02B

Claim Text:
1. A semiconductor device including a DC-DC converter, comprising: a first metal-made chip mounting portion having a first top surface over which a first semiconductor chip including a high side MOSFET of the DC-DC converter is mounted and a first bottom surface opposite the first top surface; a second metal-made chip mounting portion having a second top surface over which a second semiconductor chip including a low side MOSFET of the DC-DC converter is mounted and a second bottom surface opposite the second top surface; a third metal-made chip mounting portion having a third top surface over which a third semiconductor chip including a control circuit for driving the high and low side MOSFETs and a third bottom surface opposite the third top surface; a plurality of leads arranged around the first to third metal-made chip mounting portions; a plurality of conductive members electrically connected to the first to third semiconductor chips and the plurality of leads, respectively; and a sealing body having a top surface and a bottom surface opposite the top surface and sealing the first to third semiconductor chips, a part of each of the first to third metal-made chip mounting portions, a part of each of the plurality of leads, and the plurality of conductive members, wherein, in a plan view of the bottom surface of the sealing body, each of the first to third bottom surfaces of the first to third metal-made chip mounting portions is exposed from the bottom surface of the sealing body, and a part of the sealing body is disposed between the first to third metal-made chip mounting portions and the plurality of leads, and wherein, in the plan view, the third bottom surface of the third metal-made chip mounting portion has a tapered portion such that a shape of the third bottom surface is different from a shape of each of the first and second bottom surfaces of the first and second metal-made chip mounting portions.