Patent ID: 8115303

Claim:
An electronic apparatus, comprising: an organic laminate package substrate comprising first and second opposing surfaces, an IC (integrated circuit) chip flip-chip mounted to the first surface of the package substrate, and an area array of contacts pads formed on a second surface of the package substrate; a metallic stiffener structure bonded to the package substrate first surface to provide mechanical rigidity to the package substrate; and a metallic cooler device having upper and lower opposing surfaces and sidewall surfaces, wherein the lower surface of the metallic cooler device is thermally bonded directly to a backside surface of the IC chip; wherein the metallic cooler device is mechanically coupled to the metallic stiffener structure by extension tabs extending from the metallic stiffener member to each of the sidewall surfaces of the metallic cooler to fixedly maintain the metallic cooler device in position on the backside of the IC chip, wherein the metallic cooler device comprises a pattern of thermal fins and flow channels surrounded by sidewalls of the metallic cooler device, wherein a footprint area of the lower surface of the metallic cooler device includes an active surface cooling region and a non-active surface cooling region, wherein the active surface cooling region is defined by a surface area aligned to the pattern of thermal fins and flow channels between the sidewalls or other microstructures which have a reduced hydraulic diameter and increased cooler surface area; wherein the non-active surface cooling region surrounds the active surface cooling region, and has an area defined, in part, by a width of the sidewalls around the peripheral region of the lower surface, wherein the IC chip has a length Lc and width Wc that defines a footprint size of the backside surface of the IC chip; wherein the active cooling surface region on the lower surface of the metallic cooler device is smaller in a direction perpendicular to the flow channels than the IC chip size, and a width of the footprint area of the lower surface of the metallic cooler device is equal to or wider than the IC chip in the direction perpendicular to the flow channels.