Patent ID: 7125749
Filing Date: 2006-10-24
Classification: H01L

Abstract:
1. A manufacturing method for an integrated circuit package having at least one integrated circuit die therein having a first side having a plurality of bond pads thereon and a second side, having at least a portion of a lead frame having a plurality of leads, the plurality of leads having an enclosable portion for enclosure within the integrated circuit package, and having a heat sink having at least a portion thereof enclosable within the integrated circuit package, the manufacturing method comprising: connecting the plurality of bond pads on the first side of the at least one integrated circuit die to the plurality of leads of the lead frame using a plurality of bond wires; locating a heat sink having a surface having a first portion thereof facing portions of the lead frame located adjacent thereto, the heat sink having a substantial part of the enclosable portion of each lead of the plurality of leads of the lead frame located adjacent the surface of the first portion of the heat sink, the heat sink having a die-attach area on the surface of the first portion of the heat sink for attachment to the integrated circuit die, and the heat sink having a second portion thereof projecting away from the first portion of the heat sink under the die-attach area, the thickness of the first portion of the heat sink being less than the thickness of the second portion of the heat sink; attaching at least a portion of the second side of the integrated circuit die to at least a portion of the die-attach area on the surface of the first portion of the heat sink using a heat conductive material for transferring heat from the integrated circuit die to the heat sink; attaching at least a portion of the lead frame to at least a portion of the surface of the first portion of the heat sink, the heat sink positioned having the die-attach area on the surface of the first portion of the heat sink, the first portion of the heat sink extending beneath a substantial part of the enclosable portion of the plurality of leads of the lead frame in close proximity to the enclosable portion of the plurality of leads, the first portion of the heat sink extending beneath at least eighty percent of an area formed by the enclosable portion of a lead frame having a plurality of leads; reducing the inductance of the plurality of leads of the lead frame by varying at least one of the distance between the heat sink from the plurality of leads of the lead frame and the width of the heat sink, the thickness of the first portion of the heat sink being less than the thickness of the second portion of the heat sink resulting in a reduction of inductance of about 18 percent over a heat sink of essentially uniform thickness; connecting the enclosable portion of the plurality of leads of the lead frame to the integrated circuit die; and enclosing the enclosable portion of the plurality of leads of the lead frame, the integrated circuit die, and the enclosable portion of the heat sink in the integrated circuit package.