Patent ID: 7902646
Filing Date: 2011-03-08
Classification: H01L

Abstract:
1. A process for forming a packaged multiphase buck converter, comprising the steps of: providing a lead frame comprising a plurality of leads, a first die attach pad, a second die attach pad integral with the first die attach pad, a third die attach pad and a conductive bridge, each of which is electrically connected to the others, wherein the first and second die attach pads are in a first plane, the second die attach pad and third die attach pad being connected by the conductive bridge, the third die attach pad having a first lead; mounting a first die, with a first source, a first gate, and a first drain, to the first die attach pad such that the first drain is electrically connected to the first die attach pad, and thus to the first lead; mounting a second die, with a second source, a second gate, and a second drain, to the third die attach pad such that the second source is electrically connected to the third die attach pad, and thus to the first lead; mounting a fourth die attach pad to the second drain, wherein the fourth die attach pad is in a plane parallel to, but separated from, the first plane, the fourth die attach pad having a second lead; bending the conductive bridge such that the first and second leads contact the plurality of leads, and disposes the third die attach pad in a second plane parallel, but separated from, the first plane; mounting a fifth die attach pad, with a third lead to the first source such that the third lead contacts the plurality of leads; mounting a fourth lead to the first gate, the fourth lead contacting the plurality of leads; mounting a fifth lead to the second gate, the fifth lead contacting the plurality of leads; mounting a third die, with a third source, a third gate, and a third drain, to the second die attach pad such that the third drain electrically contacts the first drain through the first and second die attach pad; mounting a fourth die with a fourth source, a fourth gate, and a fourth drain to a sixth die attach pad with a sixth lead such that the fourth drain contacts the sixth lead; mounting the sixth die attach pad to the lead frame such that the third source contacts the sixth lead which contacts the plurality of leads; mounting a seventh lead to the fourth gate, the seventh lead contacting the plurality of leads; mounting a eighth lead to the third gate, the eighth lead contacting the plurality of leads; and mounting a seventh die attach pad with a ninth lead to the lead frame such that the fourth source contacts the ninth lead which contacts the plurality of leads.