# US 5,710,459 A · Integrated circuit package provided with multiple heat-conducting paths for enhancing heat dissipation and wrapping around cap for improving integrity and reliability

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- Number: US 5,710,459 A
- Document ID: US5710459A
- Status: Granted
- Kind: A
- Application number: 08/689,534
- Filed: 1996-08-09
- Granted: 1998-01-20
- Earliest claimed: 1995-05-19
- Assignees: Industrial Technology Research Institute
- Inventors: Kun-Tang Teng; Shin-Tang Jian; Shu-Chen Huang
- Web page: https://patentgrep.com/patent/US5710459A

## CPC

- H05K 1/0206: {by printed thermal vias}
- H10W 40/22: characterised by their shape, e.g. having conical or cylindrical projections
- H10W 40/228: {the projecting parts being wire-shaped or pin-shaped}
- H10W 76/60: Seals
- H05K 3/429: {Plated through-holes specially for multilayer circuits, e.g. having connections to inner circuit layers}
- H05K 2201/066: Heatsink mounted on the surface of the printed circuit board [PCB]
- H05K 2201/10734: Ball grid array [BGA]; Bump grid array
- H10W 72/5363: {the connected ends being wedge-shaped}
- H10W 72/884: {Die-attach connectors and bond wires}
- H10W 90/734: {between a chip and a stacked insulating package substrate, interposer or RDL}
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

This invention is discloses a packaged integrated circuit (IC) which includes an IC chip supported and securely attached to an adapter board. The package also includes a chip cap for covering and protecting the IC chip therein. The chip cap further forms a concave, step near a lower edge of the cap for wrapping around the edge of the adapter board for increasing the contact areas between the cap and the board and for securely attaching the cap to the board. The chip cap is composed of thermal conductive materials and the chip cap further includes a heat sink for dissipating heat generated from the IC chip. The adapter board further includes a plurality of connecting vias and a plurality of conductive metal balls forming a ball grid array (BGA) underneath the adapter board. The IC chip is in electrical and thermal contact with the BGA by filling the connection vias with conductive materials. A printed circuit board (PCB) is used for supporting and receiving the adapter board thereon, the PCB includes a plurality of thermal vias penetrating therethrough and filled with thermal conductive materials, wherein the thermal vias corresponding to and in contact with a plurality of the conductive metal balls of the BGA for dissipating heat generated from the IC.

## Claims

### Claim 1

A printed circuit board (PCB) for receiving an integrated circuit (IC) chip thereon wherein said IC chip including a ball grid array having a plurality of conductive metal balls electrically and thermally connected to said integrated circuit chip, the printed circuit board (PCB) comprising:
a main board including a plurality of thermal vias penetrating said main board and filled with thermal conductive materials, wherein said thermal vias are in thermal contact with a plurality of said conductive metal balls for dissipating heat generated from said IC chip and wherein said thermal vias filled with said thermal conductive material are electrically insulated from said metal balls and provided only for dissipating heat without providing an active electrical function.

### Claim 2 (depends on 1)

The printed circuit board (PCB) of claim 1 further comprising:
a heat spreading means attached to said main board which being in thermal contact with said thermal vias for spreading and enhancing heat dissipation.

### Claim 3

A packaged integrated circuit (IC) comprising:
an IC chip;
an adapter board for supporting and securely attached said IC chip thereon, said adaptor board further includes a plurality of connecting vias penetrating therethrough for electrically and thermally connecting to said IC chip wherein each of said plurality of connecting vias connected to an electric output connection means disposed on a bottom surface of said adapter board;
a chip cap for covering and protecting said IC chip therein said chip cap further forming a concave step near a lower edge of said cap for wrapping around the edge of said adapter board for increasing the contact areas between said cap and said board and securely attaching said cap to said board and said chip cap being composed of thermal conductive materials and said chip cap further including a heat sink means for dissipating heat generated from said IC chip; a main board including a plurality of thermal vias penetrating said main board and filled with thermal conductive materials, wherein said thermal vias are in thermal contact with said electric output connecting means for dissipating heat generated from said IC chip and wherein said thermal vias filled with said thermal conductive material are electrically insulated from said electric output connection means and provided only for dissipating heat without providing an active electrical function; and
a heat spreading means disposed below and integrated securely with said main board for spreading and dissipating heat transmitted from said IC chip wherein said heat spreading means and said chip cap being formed as one-integrated heat dissipation body whereby heat generated by said IC chip is provided to simultaneously dissipate from top and bottom.

### Claim 4 (depends on 3)

The packaged IC of claim 3 wherein:
each of said electric output connection means being a conductive ball thus constituting a ball grid array (BGA)underneath said adapter board; and
said thermal vias penetrating said main board are in thermal contact with a plurality of said conductive metal balls for dissipating heat generated from said IC chip and wherein said thermal vias filled with said thermal conductive material are electrically insulated from said metal balls and provided only for dissipating heat without providing an active electrical function.

### Claim 5 (depends on 4)

The packaged IC of claim 4 further comprising:
said main board is a printed circuit board (PCB) for supporting and receiving said adapter board thereon; and
said PCB including a plurality of thermal vias penetrating therethrough and filled with thermal conductive materials, wherein said thermal vias corresponding to and in contact with a plurality of said conductive metal balls of said BGA for dissipating heat generated from said IC and wherein said thermal vias filled with said thermal conductive material are electrically insulated from said metal balls being provided only for dissipating heat without providing an active electrical function.

### Claim 6 (depends on 5)

The packaged IC of claim 5 wherein:
said IC chip further being attached to said chip cap and said adapter board by using thermal conductive adhesive materials.

### Claim 7

A packaged integrated circuit (IC) comprising:
an IC chip;
an adapter board for supporting and securely attached said IC chip thereon;
a chip cap for covering and protecting said IC chip therein said chip cap further forming a concave step near a lower edge of said cap for wrapping around the edge of said adapter board for increasing the contact areas between said cap and said board and securely attaching said cap to said board;
said chip cap being composed of thermal conductive materials and said chip cap further including a heat sink means for dissipating heat generated from said IC chip;
said adapter board further including a plurality of connecting vias and a plurality of conductive metal balls forming a ball grid array (BGA) underneath said adapter board;
said IC chip being in electrical and thermal contact with said BGA by filling said connection vias with conductive materials; and
A printed circuit board (PCB) for supporting and receiving said adapter board thereon, said PCB including a plurality of thermal vias penetrating therethrough and filled with thermal conductive materials, wherein said thermal vias corresponding to and in contact with a plurality of said conductive metal balls of said BGA for dissipating heat generated from said IC and wherein said thermal vias filled with said thermal conductive material are electrically insulated from said metal balls and provided only for dissipating heat without providing an active electrical function.

### Claim 8 (depends on 7)

The packaged IC of claim 7 wherein: said IC chip further being attached to said chip cap and said adapter board by using thermal conductive adhesive materials.

### Claim 9 (depends on 8)

The packaged IC of claim 8 wherein: said PCB further includes a heat spreading means for spreading and dissipating heat transmitted from said IC chip.

### Claim 10 (depends on 8)

The packaged IC of claim 8 wherein: said PCB further includes a heat sink means for dissipating heat transmitted from said IC chip.