Patent ID: 7696612

Claim:
A packaged multiphase synchronous buck converter with at least four dice and at least nine leads comprising: a first die with a first source, a first gate, and a first drain, wherein the first die is attached to a first die attach pad which is integral with a second die attach pad and a third die attach pad. the third die attach pad being disposed parallel to but in a different plane from the first and second die attach pads; a second die with a second source, a second gate, and a second drain, the second source is electrically connected to the first drain, wherein the second die is attached to a fourth die attach pad that is disposed in a plane that is parallel to but separated from the first, second and third die attach pads; a third die with a third source, a third gate, and a third drain, the third drain is electrically connected to the second source and the first drain; a fourth die with a fourth source, a fourth gate, and a fourth drain, the fourth drain is electrically connected to the third source; a first lead electrically connected to the first drain, the second source, and the third drain; a second lead electrically connected to the second drain; a third lead electrically connected to the first source; a fourth lead electrically connected to the first gate; a fifth lead electrically connected to the second gate; a sixth lead electrically connected to the third source and fourth drain; a seventh lead electrically connected to the fourth source; an eighth lead electrically connected to the third gate; and a ninth lead electrically connected to the fourth gate.