Die-up ball grid array package with printed circuit board attachable heat spreader
An electrically and thermally enhanced die-up tape substrate ball grid array (BGA) package and die-up plastic substrate BGA package are described. A substrate that has a first surface and a second surface is provided. The stiffener has a first surface and a second surface. The second stiffener surface is attached to the first substrate surface. An IC die has a first surface and a second surface. The first IC die surface is mounted to the first stiffener surface. A plurality of solder balls is attached to the second substrate surface. In one aspect, a heat spreader is mounted to the second IC die surface. In another aspect, the stiffener is coupled to ground to act as a ground plane. In another aspect, the substrate has a window opening that exposes a portion of the second stiffener surface. The exposed portion of the second stiffener surface is configured to be coupled to a printed circuit board (PCB). In another aspect, a metal ring is attached to the first stiffener surface. In another aspect, wire bond openings in the stiffener are bridged by one or more studs.
1. A ball grid array (BGA) package, comprising:
a substantially planar substrate having a plurality of contact pads on a first surface electrically connected through said substrate to a plurality of solder ball pads on a second surface of said substrate, wherein said substrate has an opening formed through said substrate that is open at said first and said second surfaces of said substrate;
a metal stiffener having a first surface and a second surface, wherein said first surface of said stiffener is attached to said first surface of said substrate, wherein said stiffener has an opening through said stiffener that is open at said first and second surfaces of said stiffener;
an integrated circuit (IC) die mounted to a central location of the second surface of said stiffener, wherein said IC die includes a bond pad;
a wire bond that couples said bond pad to a contact pad on said first surface of said substrate through said opening in said stiffener; and
a thermal connector attached to a portion of said first surface of said stiffener through said opening in said substrate, wherein a surface of said thermal connector is capable of being attached to a printed circuit board (PCB);
wherein said stiffener is a heat spreader; and
wherein said stiffener and said thermal connector provide a thermal path from said IC die to a PCB during operation of the IC die.
2. The package of claim 1 , wherein said surface of said thermal connector is plated with solder.
3. The package of claim 1 , further comprising:
a second wire bond that couples a second bond pad of said IC die to said second surface of said stiffener.
4. The package of claim 1 , further comprising:
a thermally conductive adhesive layer that mounts said IC die to said second surface of said stiffener.
5. The package of claim 1 , further comprising:
a thermally conductive adhesive layer that attaches said thermal connector to said portion of said first surface of said stiffener.
6. The package of claim 1 , further comprising:
an electrically conductive adhesive layer that attaches said thermal connector to said portion of said first surface of said stiffener.
7. The package of claim 3 , wherein said second bond pad is coupled to a ground potential signal in said IC die, whereby said stiffener and said thermal connector serve as a ground plane.
8. The package of claim 3 , wherein said second bond pad is coupled to a power potential signal in said IC die, whereby said stiffener and said thermal connector serve as a power plane.
9. The package of claim 1 , wherein said substrate is a tape substrate.
10. The package of claim 1 , wherein said substrate is an organic substrate.
11. The package of claim 1 , further comprising:
a plurality of solder balls attached to said plurality of solder ball pads.
12. The package of claim 1 , wherein said thermal connector comprises at least one metal.
13. The package of claim 12 , wherein said at least one metal includes copper.
14. The package of claim 12 , wherein said at least one metal includes aluminum.
15. The package of claim 1 , wherein said thermal connector is substantially planar.
16. A ball grid array (BGA) package, comprising:
a substantially planar substrate having a plurality of contact pads on a first surface electrically connected through said substrate to a plurality of solder ball pads on a second surface of said substrate, wherein said substrate has an opening formed through said substrate that is open at said first and said second surfaces of said substrate;
a metal stiffener that has a first surface and a second surface, wherein said first surface of said stiffener is attached to said first surface of said substrate, wherein said stiffener has an opening through said stiffener that is open at said first and second surfaces of said stiffener;
an integrated circuit (IC) die mounted to a central location of the second surface of said stiffener, wherein said IC die includes a bond pad;
a wire bond that couples said bond pad to a contact pad on said first surface of said substrate through said opening in said stiffener; and
a heat sink attached to a portion of said first surface of said stiffener through said opening in said substrate, wherein a surface of said heat sink is capable of being attached to a printed circuit board (PCB);
wherein said stiffener is a heat spreader; and
wherein said stiffener and said heat sink provide a thermal path from said IC die to a PCB during operation of the IC die.
17. The package of claim 16 , wherein said surface of said heat sink is plated with solder.
18. The package of claim 16 , further comprising:
a second wire bond that couples a second bond pad of said IC die to said second surface of said stiffener.
19. The package of claim 18 , wherein said second bond pad is coupled to a ground potential signal in said IC die, whereby said stiffener and said heat sink serve as a ground plane.
20. The package of claim 18 , wherein said second bond pad is coupled to a power potential signal in said IC die, whereby said stiffener and said heat sink serve as a power plane.
21. A ball grid array (BGA) package, comprising:
a substantially planar substrate having a plurality of contact pads on a first surface electrically connected through said substrate to a plurality of solder ball pads on a second surface of said substrate, wherein said substrate has an opening formed through said substrate that is open at said first and said second surfaces of said substrate;
a metal stiffener that has a first surface and a second surface, wherein said first surface of said stiffener is attached to said first surface of said substrate, wherein said stiffener has an opening through said stiffener that is open at said first and second surfaces of said stiffener;
an integrated circuit (IC) die mounted to a central location of the second surface of said stiffener, wherein said IC die includes a bond pad;
a wire bond that couples said bond pad to a contact pad on said first surface of said substrate through said opening in said stiffener; and
a first heat spreader attached to a portion of said first surface of said stiffener through said opening in said substrate, wherein a surface of said first heat spreader is capable of being attached to a printed circuit board (PCB);
wherein said stiffener is a heat spreader; and
wherein said stiffener and said first heat spreader provide a thermal path from said IC die to a PCB during operation of the IC die.
22. The package of claim 21 , wherein said surface of said first heat spreader is plated with solder.
23. The package of claim 21 , further comprising:
a second wire bond that couples a second bond pad of said IC die to said second surface of said stiffener.
24. The package of claim 23 , wherein said second bond pad is coupled to a ground potential signal in said IC die, whereby said stiffener and said first heat spreader serve as a ground plane.
25. The package of claim 23 , wherein said second bond pad is coupled to a power potential signal in said IC die, whereby said stiffener and said first heat spreader serve as a power plane.