Apparatus for effecting reliable heat transfer of bare die microelectronic device and method thereof

1. Apparatus comprising: a bare die microelectronic device; a heat sink assembly, a heat sink mounting assembly for mounting the heat sink assembly independently of the bare die microelectronic device; a force applying mechanism that loads, under controlled forces, a surface of the bare die microelectronic device into a direct heat transfer relationship at a thermal interface with the heat sink assembly; a surface mount assembly that couples the bare die microelectronic device to a first surface of a printed board, and; wherein the surface mount assembly includes a first ball grid array assembly.

2. The apparatus of claim 1 further comprising a first filler material disposed in the first ball grid array assembly that serves to fill air voids and adhesively attach the first ball grid array assembly to the printed board.

3. The apparatus of claim 2 wherein the first filler material substantially reduces or eliminates relaxation thereof following compression loading of the first ball grid array assembly.

4. The apparatus of claim 1 wherein the bare die microelectronic device includes a silicon bare die mounted on a dielectric member; a second ball grid array assembly mounts the silicon bare die to the dielectric member; and, a second filler material disposed in the second ball grid array assembly that serves to fill air voids therein, wherein the filler material of the second ball grid array assembly substantially reduces or eliminates relaxation thereof following compression loading of the second ball grid array assembly.

5. Apparatus comprising: a bare die microelectronic device; a heat sink assembly, a heat sink mounting assembly for mounting the heat sink assembly independently of the bare die microelectronic device; a force applying mechanism that loads, under controlled forces, a surface of the bare die microelectronic device into a direct heat transfer relationship at a thermal interface with the heat sink assembly; a surface mount assembly that couples the bare die microelectronic device to a first surface of a printed board, and; wherein the heat sink mounting assembly includes mounting fastening members that secure the heat sink assembly to a supporting structure, and a plurality of resiliently deformable spacers are interposed between the printed board and the mounting fastening members.

6. Apparatus comprising: a bare die microelectronic device; a heat sink assembly, a heat sink mounting assembly for mounting the heat sink assembly independently of the bare die microelectronic device; a force applying mechanism that loads, under controlled forces, a surface of the bare die microelectronic device into a direct heat transfer relationship at a thermal interface with the heat sink assembly, wherein the force applying mechanism includes at least a spring member that is actuated by an actuating member for applying the controlled forces, and; wherein the force applying mechanism includes a stiffener element interposed between the actuating member and the printed board.

7. A method of transferring heat from a bare die microelectronic device to a heat sink assembly comprising:

supporting a heat sink assembly independently of a bare die microelectronic device;

urging a surface of a bare die microelectronic device into direct heat transfer relationship at a thermal interface with a heat sink assembly under controlled forces, wherein the urging includes a force applying mechanism that is actuatable to deliver the controlled forces to the bare die microelectronic device to urge the latter into the heat transfer relationship with the heat sink assembly, wherein the force applying mechanism delivers the controlled forces to a surface of the printed board that is opposed to a surface upon which the bare die microelectronic device is mounted, and;

supporting the bare die microelectronic device on a printed board through a surface mount assembly, wherein the supporting the bare die microelectronic device through a surface mount assembly includes using a first ball grid array assembly.

8. The method of claim 7 further comprising providing a filler material in the ball grid array assembly that serves to fill any air voids and adhesively attaches the first ball grid array assembly to the printed board.

9. The method of claim 8 further comprising providing a filler material that minimizes or eliminates relaxation thereof following compression loading of the first ball grid array assembly.

10. The method of claim 9 further comprising providing the bare die microelectronic device with a silicon bare die mounted on a dielectric member, a second ball grid array assembly mounting the silicon bare die to the dielectric member, and a filler material in the second ball grid array assembly that attaches the silicon bare die to the dielectric member and serves to fill air voids therebetween and substantially reduces or eliminates relaxation thereof following compression loading of the second ball grid array assembly.

11. The method of claim 10 wherein supporting the heat sink assembly includes providing mounting fastening members that secure the heat sink assembly to a supporting structure, and further supporting the heat sink assembly with a plurality of resiliently deformable spacers interposed between the printed board and mounting fastening members.