WO2001006821A1 - Encapsulated packaging in between 2 pcbs - Google Patents
Encapsulated packaging in between 2 pcbs Download PDFInfo
- Publication number
- WO2001006821A1 WO2001006821A1 PCT/US2000/018081 US0018081W WO0106821A1 WO 2001006821 A1 WO2001006821 A1 WO 2001006821A1 US 0018081 W US0018081 W US 0018081W WO 0106821 A1 WO0106821 A1 WO 0106821A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- circuit board
- printed circuit
- heat
- heatsink
- assembly
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
- H05K7/20509—Multiple-component heat spreaders; Multi-component heat-conducting support plates; Multi-component non-closed heat-conducting structures
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/18—Packaging or power distribution
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/18—Packaging or power distribution
- G06F1/181—Enclosures
- G06F1/182—Enclosures with special features, e.g. for use in industrial environments; grounding or shielding against radio frequency interference [RFI] or electromagnetical interference [EMI]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/18—Packaging or power distribution
- G06F1/189—Power distribution
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/14—Structural association of two or more printed circuits
- H05K1/141—One or more single auxiliary printed circuits mounted on a main printed circuit, e.g. modules, adapters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/14—Structural association of two or more printed circuits
- H05K1/144—Stacked arrangements of planar printed circuit boards
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/151—Die mounting substrate
- H01L2924/1517—Multilayer substrate
- H01L2924/15192—Resurf arrangement of the internal vias
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0201—Thermal arrangements, e.g. for cooling, heating or preventing overheating
- H05K1/0203—Cooling of mounted components
- H05K1/0204—Cooling of mounted components using means for thermal conduction connection in the thickness direction of the substrate
- H05K1/0206—Cooling of mounted components using means for thermal conduction connection in the thickness direction of the substrate by printed thermal vias
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0263—High current adaptations, e.g. printed high current conductors or using auxiliary non-printed means; Fine and coarse circuit patterns on one circuit board
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10227—Other objects, e.g. metallic pieces
- H05K2201/10325—Sockets, i.e. female type connectors comprising metallic connector elements integrated in, or bonded to a common dielectric support
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10431—Details of mounted components
- H05K2201/10598—Means for fastening a component, a casing or a heat sink whereby a pressure is exerted on the component towards the PCB
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10613—Details of electrical connections of non-printed components, e.g. special leads
- H05K2201/10621—Components characterised by their electrical contacts
- H05K2201/10704—Pin grid array [PGA]
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10613—Details of electrical connections of non-printed components, e.g. special leads
- H05K2201/10621—Components characterised by their electrical contacts
- H05K2201/10734—Ball grid array [BGA]; Bump grid array
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/36—Assembling printed circuits with other printed circuits
- H05K3/368—Assembling printed circuits with other printed circuits parallel to each other
Definitions
- This invention relates in general to a methodology to improve thermal and mechanical issues created by increased interconnect density, increased power levels by electronic circuits and increased levels of integrated electronic packaging.
- the present invention addresses these issues by encapsulating the circuitry within a circuit board structure which improves thermal, mechanical and integrated circuit device management over existing technologies known in the art today.
- Chip- Modules has brought about significant improvements in the packaging cost and density of electronic circuits.
- PCBs which shall be meant to include technologies associated with MCMs as well.
- PCB area also known as PCB "real estate"
- PCB area also known as PCB "real estate”
- PCB "real estate” With smaller packaging envelopes becoming the norm in electronics, e.g., laptop computers, spacecraft, cellular telephones, etc., large PCBs are not available for use to mount SMT chips, BGAs, flip chips or other devices.
- Newer methods are emerging to decrease the size of PCBs such as Build- Up-Multilayer technology, improved organic laminate materials with reduced thicknesses and dielectric constants and laser beam photo imaging. These technologies produce greater pressure to maintain the functionality of the PCB assembly in thermal, EMI and power application to the semiconductor devices. It can be seen, then, that there is a need in the art for a method for decreasing the size of PCBs while maintaining the functionality of PCBs. Further, there is a need for reducing the size of PCBs while using present-day manufacturing techniques to maintain low cost packaging.
- the present invention discloses an encapsulated circuit assembly which utilizes printed circuit boards as a foundation for the assembly structure.
- the assembly comprises a first printed circuit board, a second printed circuit board, and a heat transfer device.
- the second printed circuit board comprises a thermal heatsink or secondary heat transfer mechanism such as a heat pipe and heat transfer devices imbedded within the second printed circuit board which thermally couples devices mounted on the first printed circuit board and the thermal heat sink of the second printed circuit board.
- An object of the present invention is to provide more efficient usage of printed circuit board real estate. Another object of the present invention is to increase the density of electronics on printed circuit boards. Another object of the present invention is to provide heat transfer from devices on printed circuit boards.
- FIGS. 1A-1C illustrate the construction of a printed circuit board assembly using the present invention
- FIGS. 2A-2B illustrate the construction of a printed circuit board assembly using the present invention for multiple heat generating integrated circuit devices
- FIG. 3A-3B illustrate spacers which is used in conjunction with the present invention
- FIGS. 4A-4C illustrate the construction of a printed circuit board using the present invention wherein the thermal heat sink is located outboard the active circuit area;
- FIGS. 5 A and 5B illustrate the thermal considerations of a printed circuit board embodying the present invention
- FIG. 6 illustrates a flow chart describing the steps used in practicing the present invention.
- the present invention discloses an encapsulated circuit assembly and a method for making such an assembly.
- the assembly comprises a first printed circuit board, a second printed circuit board, and heat transfer devices.
- the second printed circuit board comprises a heatsink or secondary heat transfer mechanism such as heat pipes and heat transfer devices imbedded within the second printed circuit board which thermally couples devices mounted on the first printed circuit board and the thermal heat sink of the second printed circuit board.
- the present invention provides a method and apparatus for mounting integrated circuit devices onto PCBs that removes the heat from those devices that generate large amounts of heat.
- the present invention allows for air cooling, heat pipe cooling, or other methods of cooling devices, as well as a compact packaging design to allow for heat generating devices to be packaged into small volumes.
- the present invention can be expanded to provide beneficial aspects to the art of power distribution, containment of electromagnetic interference and electronic signal interconnect.
- FIGS. 1A-1C illustrate the construction of an encapsulated circuit assembly using the present invention.
- FIG. 1A illustrates an exploded view of assembly 100.
- Assembly 100 comprises first printed circuit board (PCB) 102, second PCB 104, and heat transfer device 106.
- First PCB 102 can be a single layer PCB or multi-layer PCB, where the multi- layer PCB is comprised of alternating layers of conducting and non-conducting materials to allow electrical signals to be routed from device to device on the first PCB 102.
- Devices 108-116 are shown mounted on first PCB 102.
- Devices 114 and 116 are shown as being mounted on the opposite side of first PCB 102 as devices 108-112. This illustrates that first PCB 102 can have devices 108-116 mounted on both sides.
- Device 108 is coupled to first PCB 102 via a Ball Grid Array (BGA) 118.
- BGA Ball Grid Array
- 118 provides electrical contacts between device 108 and first PCB 102.
- Other methods of electrical coupling between device 108 and first PCB 102 are possible, e.g., wire bonding, solder connections, etc. Further, there can also be thermal coupling between device 108 and PCB 102 if desired.
- Heat transfer device 106 couples device 108 to second PCB 104.
- Heat transfer device 106 is typically a thermally conductive material, e.g., thermal grease, thermal epoxy, or a commercially produced material such as THERMA-GAPTM. Heat transfer device 106 provides a thermal interface between device 108 and the second PCB 104. Heat transfer device 106 is typically a mechanically compliant material to allow for minimal applied pressure to the device 108 such that device 108 is not subjected to additional stress through use of heat transfer device 108. Spacers 141 and fasteners 142 provide for a precision alignment between boards
- the location of the spacers 141 adjacent to the device 108 reduce variations in spacing caused by bo wand warpage of board 102 and, to some extent, board 104.
- Devices 110-116 that are thermally active but do not require heat transfer device 106 to cool the devices 110-116 and are cooled by conduction through first PCB 102, or through convection should air flow be available across first PCB 102. Otherwise, additional devices 110-116 can be coupled to second PCB 104 through additional heat transfer devices 106.
- the present invention is not limited to a single device 108 that is cooled through the use of heat transfer device 106. Any number of devices 108- 116 can be cooled through the use of single or multiple heat transfer devices 106.
- Second PCB 104 is mechanically coupled to first PCB 102 through the use of fasteners 120 and standoffs 122.
- Fasteners 120 are typically screws, but can be other types of fasteners such as rivets, hollow feedthroughs, connectors, or other fasteners.
- Standoffs 122 are typically unthreaded inserts with a height equal to the height of spacer 141.
- the fasteners 120 and standoffs 122 are located at mechanically and/ or electrically desirable locations on first PCB 102. These locations are typically at the periphery of first PCB 102, but can be anywhere on first PCB 102.
- Second PCB 104 has areas 124 that are designed to facilitate the transfer of heat from device 108, through heat transfer device 106, to a heat sink.
- Areas 124 comprise plated through holes (PTHs) 126, consisting of holes in board 104 with interior walls of plated copper or other high thermally conductive material.
- PTHs plated through holes
- the region within the hole may be filled with metal, liquid filled areas, or other thermal transfer devices or mechanisms to enhance thermal conduction between the material 106 and the heatsink 130.
- Areas 124 can be designed to be the same size, a larger size, or a smaller size than the device 108, depending on the heat dissipation requirements for device 108 and the size of second PCB 104.
- PTHs 126 provide a means of reducing air pockets in material 106 and to provide a volume where excesses of material 106 may flow in the case of a reduced gap between device 108 and board 104. Still another benefit of PTHs 126 can be to adjust the thermal conductivity of the paths of multiple devices 108 on a single first PCB 102 to the common "isothermal" heatsink 130 such that if the two devices 108 have differing heat flow then the conductivity in each thermal path can be adjusted such that the junction temperature of each device 108 will be the same. This can be beneficial in improving timing margins of digital devices.
- Thermal interface 128 is coupled to second PCB 104 to equalize and transfer heat from device 108, through heat transfer device 106 and second PCB 104 area 124 to heat sink 130.
- heatsink 130 can be any device, e.g., a heat pipe, or a layer on second PCB 104 that acts as an isothermal conduction layer to properly remove the heat generated by device 108.
- Thermal interface 128 can be electrically conductive, or non- electrically conductive, depending on the design for second PCB 104.
- thermal interface 128 should be electrically non- conductive so as not to interfere with signals travelling between devices 108-116 that are mounted on second PCB 104.
- Thermal interface 128 can be thermal epoxy or any other material which thermally and mechanically bonds second PCB 104 to heatsink 130.
- FIG. IB illustrates the assembly 100 as a completed assembly.
- the thermal coupling of device 108, heat transfer device 106, second PCB 104 in conjunction with PTHs 126, thermal interface 128, and heatsink 130 provide a thermal path for heat generated by device 108 to be dissipated by heatsink 130. Further, airflow can be provided to further cool device 108 and devices 110-116.
- heatsink 130 can be larger or smaller than the area of second PCB 104. Heatsink 130 also acts as a mechanical stabilizer for assembly 100, to provide additional mechanical stability for assemblies 100 that will experience more severe mechanical environments, e.g., vibration.
- FIG. 1C illustrates assembly 100 in an isometric view.
- Heatsink 130 is shown as smaller than second PCB 104 and thermal interface 128 to illustrate the flexibility of the design of the present invention. Airflow can again be provided to increase the heat dissipation capabilities of assembly 100.
- FIGS. 2A-2B illustrate the construction of an encapsulated circuit assembly using the present invention for multiple heat generating integrated circuit devices.
- FIG. 2A illustrates an exploded view of assembly 100.
- Assembly 100 comprises first printed circuit board (PCB) 102, second PCB 104, and heat transfer device 106.
- First PCB 102 can be a single layer PCB or multi-layer PCB, where the multi-layer PCB is comprised of alternating layers of conducting and non-conducting materials to allow electrical signals to be routed from device to device on the first PCB 102.
- Devices 108, 114-116, and 132 are shown mounted on first PCB 102.
- Devices 114 and 116 are shown as being mounted on the opposite side of first PCB 102 as devices 108 and 132. This illustrates that first PCB 102 can have devices 108, 114-116, and 132 mounted on both sides.
- Devices 108 and 132 are coupled to first PCB 102 via a Ball Grid Array (BGA) 118.
- BGA 118 provides electrical contacts between devices 108 and 132 and first PCB 102.
- Other methods of electrical coupling between devices 108 and 132 and first PCB 102 are possible, e.g., Tape Automated Bonding (TAB), SMT, flip chip, etc.
- TAB Tape Automated Bonding
- SMT Spin Transfer Device 106
- Heat transfer device 106 couples device 108 to second PCB 104.
- Heat transfer device 106 is typically a thermally conductive material, e.g., thermal grease, thermal epoxy, or a commercially produced material such as THERMA-GAPTM.
- Heat transfer device 106 provides a thermal interface between device 108 and the second PCB 104.
- Heat transfer device 106 is typically a mechanically compliant material to allow for rninimal applied pressure to the device 108 such that device 108 is not subjected to additional stress through use of heat transfer device 108.
- Spacers 141 and fasteners 142 provide for a precision alignment between boards 102 and 104 and the device 108 such that a controlled gap exists in which heat transfer device 106 can properly be accommodated without deleterious air gaps nor excessive pressure applied to device 108. Additionally, the location of the spacers 141 adjacent to the device 108 reduce variations in spacing caused by bow and warpage of board 102 and, to some extent, board 104. Devices 114-116 that are thermally active but do not require heat transfer device
- Device 132 is another heat generating device similar to device 108. However, all devices 108 and 132 that will require additional cooling through heat transfer device 106, second PCB 104, and heatsink 130 are not the same size and/or height. Therefore, each device 108 and 132 must be treated individually using the present invention to best provide heat dissipation for each device 108 and 132. In FIG. 2A, device 132 is shown as having a height 134 smaller than height 136 of device 108. There can be many devices 108 and 132 of varying heights mounted on first PCB 102, all of which can be cooled by the assembly 100 of the present invention, through use of an additional thermal interface 138 and a thermally conductive spacer 140.
- Thermal interface 138 provides a thermal path for device 132 that will allow heat generated by device 132 to be dissipated by heatsink 130.
- Thermal interface 138 can be similar to heat transfer device 106, but can also be a different thermal transfer material to provide a proper thermal dissipative path.
- thermal interface 138 need not be mechanically compliant so long as thermal interface 106 above it is. Thus, the use of a hardening thermal epoxy may be useful to hold spacer 140 in place during assembly.
- Spacer 140 is provided to increase height 134 to approximate height 136. This allows device 108 and device 132 to contact heat transfer device 106, which in turn contacts second PCB 104 and heatsink 130 to transfer heat from devices 108 and 132 to heatsink 130. Spacer 140 is shown as larger in size than device 132, which can provide for heat spreading of the heat generated by device 132 to heatsink 130. Spacer 140 can be of any size relative to device 132. Further, there can be spacers 140 on more than one device 108 and 132. Where height differences between devices are relatively small and power levels modest these height differences may beneficially be accommodated by selecting varying thicknesses of heat transfer device 106 rather than utilizing thermal interface 138 and spacer 140.
- Second PCB 104 is coupled mechanically to first PCB 102 through the use of fasteners 120 and standoffs 122.
- Fasteners 120 are typically screws, but can be other types of fasteners such as rivets, feedthroughs that are hollow, connectors, or other fasteners.
- Standoffs 122 are typically unthreaded inserts with a height equal to the height of spacer 141.
- the fasteners 120 and standoffs 122 are located at mechanically and/or electrically desirable locations on first PCB 102. These locations are typically at the periphery of first PCB 102, but can be anywhere on first PCB 102.
- Second PCB 104 has areas 124 that are designed to facilitate the transfer of heat from devices 108 and 132, through heat transfer device 106, to a heat sink.
- Areas 124 comprise plated through holes (PTHs) 126, consisting of holes in board 104 with interior walls of plated copper or other high thermally conductive material.
- PTHs plated through holes
- Areas 124 can be designed to be the same size, a larger size, or a smaller size than the device 108, depending on the heat dissipation requirements for device 108 and the size of second PCB 104.
- An additional benefit of PTHs 126 is to provide a means of reducing air pockets in material 106 and to provide a volume where excesses of material 106 may flow in the case of a reduced gap between device 108 and 104.
- Thermal interface 128 is coupled to second PCB 104 to equalize and transfer heat from device 108, through heat transfer device 106 and second PCB 104 area 124 to heat sink 130.
- heatsink 130 can be any device, e.g., a heat pipe, or a layer on second PCB 104 that acts as an isothermal conduction layer to properly remove the heat generated by device 108.
- Thermal interface 128 can be electrically conductive, or non- electrically conductive, depending on the design for second PCB 104. For example, if devices 108-116 need to be mounted on second PCB 104, thermal interface 128 can be electrically non-conductive so as not to interfere with signals travelling between devices 108-116 that are mounted on second PCB 104.
- Thermal interface 128 can be thermal epoxy or any other material which thermally and mechanically bonds board 104 to heatsink 130.
- FIG. 2B illustrates the assembly 100 of FIG. 2A as a completed assembly.
- the thermal coupling of devices 108 and 132, heat transfer device 106, thermal interface 138, spacer 140, second PCB 104 in conjunction with PTHs 126, thermal interface 128, and heatsink 130 provide thermal paths for heat generated by devices 108 and 132 to be dissipated by heatsink 130. Further, airflow can be provided to further cool devices 108 and 132, as well as devices 110-116.
- heatsink 130 can be larger or smaller than the area of second PCB 104.
- Heatsink 130 also acts as a mechanical stabilizer for assembly 100, to provide additional mechanical stability for assemblies 100 that will experience more severe mechanical environments, e.g., vibration.
- FIG. 3 A illustrates in plan and section views a molded plastic spacer 143 that ma be used in place of spacers 141 around a device that must be thermally coupled to board 104.
- This spacer has clearance holes 145 for fasteners 142.
- spacer 143 is shown with four clearance holes 145, spacer 143 can have any number of clearance holes 145 without departing from the scope of the present invention.
- Imbedded metal spacers ma be molded into holes 145 where it ma be desirous to provide electrical contact between board 102 and board 104.
- Spacer 143 substantially surrounds device 108, but can take any shape desired.
- a feature of the spacer is pins 144 that engage in mating holes of board 102 and act to hold spacer 143 in place until final assembly of assembly 100.
- An additional benefit of spacer 143 is that it provides complete enclosure of device 108 to prevent accidental damage.
- spacer 143 ma be used to provide thermal isolation between device 108 and the remainder of the board assembly 100.
- FIG. 3B illustrates a molded plastic spacer 147 that may be used in place of spacers 141 which have been previously described as used to couple second PCB 104 to first PCB 102.
- This spacer 147 is shown as having ten clearance holes 150 for fasteners 120, however a larger or smaller number of fasteners may be used as the need and size of the PCBs 102 and 104 require.
- Imbedded metal spacers maybe molded into holes 150 where it ma be desirous to provide electrical contact between board 102 and board 104.
- the entire molded assembly may be formed as a cast metal structure or other metallic form which may be useful in the containment of electromagnetic radiation.
- spacer 147 A feature of the spacer 147 is pins 149 that engage in mating holes of board 102 and act to hold in place spacer 147 until final assembly of 100.
- An additional benefit of spacer 147 is that it provides complete enclosure of device 108 to prevent accidental damage.
- spacer 147 may be used to provide environmental isolation to the internal components of assembly 100.
- FIGS. 4A-4C illustrate the construction of a printed circuit board using the present invention.
- FIG. 4A illustrates an exploded view of assembly 100.
- Assembly 100 comprises first printed circuit board (PCB) 102, second PCB 104, and heat transfer device 106.
- First PCB 102 can be a single layer PCB or multi-layer PCB, where the multi- layer PCB is comprised of alternating layers of conducting and non-conducting materials to allow electrical signals to be routed from device to device on the first PCB 102.
- Devices 108, 114, and 116 are shown mounted on first PCB 102.
- Devices 114 and 116 are shown as being mounted on the opposite side of first PCB 102 as device 108. This illustrates that first PCB 102 can have devices 108, 114, and 116 mounted on both sides.
- Device 108 is coupled to first PCB 102 via a Ball Grid Array (BGA) 118.
- BGA 118 provides electrical contacts between device 108 and first PCB 102.
- Other methods of electrical coupling between device 108 and first PCB 102 are possible, e.g., wire bonding, solder connections, etc. Further, there can also be thermal coupling between device 108 and PCB 102 if desired.
- Heat transfer device 106 couples device 108 to second PCB 104.
- Heat transfer device 106 is typically a thermally conductive material, e.g., thermal grease, thermal epoxy, or a commercially produced material such as THERMA-GAPTM.
- Heat transfer device 106 provides a thermal interface between device 108 and the second PCB 104.
- Heat transfer device 106 is typically a mechanically compliant material to allow for rrunimal applied pressure to the device 108 such that device 108 is not subjected to additional stress through use of heat transfer device 108.
- Spacers 141 and fasteners 142 provide for a precision alignment between boards 102 and 104 and the device 108 such that a controlled gap exists in which heat transfer device 106 can properly be accommodated without deleterious air gaps nor excessive pressure applied to device 108. Additionally, the location of the spacers 141 adjacent to the device 108 reduce variations in spacing caused by bow and warpage of board 102 and, to some extent, board 104.
- Devices 114- 116 that are thermally active but do not require heat transfer device 106 to cool the devices 114-116 are cooled by conduction through first PCB 102, or through convection should air flow be available across first PCB 102. Otherwise, additional devices 114-116 can be coupled to second PCB 104 through additional heat transfer devices 106.
- the present invention is not limited to a single device 108 that is cooled through the use of heat transfer device 106. Any number of devices 108 can be cooled through the use of single or multiple heat transfer devices 106.
- Second PCB 104 is coupled mechanically to first PCB 102 through the use of fasteners 120 and standoffs 122.
- Fasteners 120 are typically screws, but can be other types of fasteners such as rivets, hollow feedthroughs, connectors, or other fasteners.
- Standoffs 122 are typically unthreaded inserts with a height equal to the height of spacer 141.
- the fasteners 120 and standoffs 122 are located at mechanically and/or electrically desirable locations on first PCB 102. These locations are typically at the periphery of first PCB 102, but can be anywhere on first PCB 102.
- Second PCB 104 has areas 124 that are designed to facilitate the transfer of heat from device 108, through heat transfer device 106, to a heat sink
- Areas 124 comprise plated though holes (PTHs) 126, consisting of holes in board 104 with interior walls of plated copper or other high thermally conductive material.
- PTHs plated though holes
- the region within the hole may be filled with metal or other thermal transfer devices or mechanisms to enhance thermal conduction between the material 106 and the heatsink 130.
- Areas 124 can be designed to be the same size, a larger size, or a smaller size than the device 108, depending on the heat dissipation requirements for device 108 and the size of second PCB 104.
- PTHs 126 provide a means of reducing air pockets in material 106 and to provide a volume where excesses of material 106 may flow in the case of a reduced gap between device 108 and board 104. Still another benefit of PTHs 126 can be to adjust the thermal conductivity of the paths of devices 108 and 132 to the common "isothermal" lateral heat spreader block 146 such that if the two devices have differing heat flow then the conductivity in each path can be adjusted such that the junction temperature of each device will be the same. This can be beneficial in improving timing margins of digital devices.
- Thermal interface 128 is coupled to second PCB 104 to equalize and transfer heat from device 108, through heat transfer device 106 and second PCB 104 area 124 to lateral heat spreader block 146.
- Heat spreader block 146 is desirably of a thermally high conductivity material such as aluminum which allows the heat emanating from devices 108 and 132 to flow to heat sink 130 which is located outside of the volume used by boards 102 and 104. Additionally, heat spreader block 146 may incorporate imbedded heat pipes to enhance lateral thermal conduction and/or reduce height.
- heatsink 130 can be any device, e.g., a heat pipe, that can conduct heat out of the heat spreader block 146.
- Thermal interface 128 can be electrically conductive, or non- electrically conductive, depending on the design for second PCB 104. For example, if devices 108-116 need to be mounted on second PCB 104, thermal interface 128 should be electrically non- conductive so as not to interfere with signals travelling between devices 108-116 that are mounted on second PCB 104. Thermal interface 128 can be thermal epoxy or any other material which thermally and mechanically bonds board 104 to heatsink 130 and between heatsink 130 and heat spreader block 146.
- heatsink 130 is now shown as being mounted outboard the volume occupied by PCB 102 and second PCB 104.
- This flexibility of the present invention to mount the heatsink 130 at multiple locations provides additional design capabilities, i.e., the height of assembly 100 is now independent of the height of heatsink 130.
- heat dissipative capability is provided without additional volume requirements for assembly 100 other than the height of heat spreader block 146.
- FIG. 4B illustrates the assembly 100 as a completed assembly.
- the thermal coupling of device 108, heat transfer device 106, second PCB 104, thermal interface 128, heat spreader block 146 and heatsink 130 provide a thermal path for heat generated by device 108 to be dissipated by heatsink 130. Further, airflow can be provided to further cool device 108 and devices 114-116.
- Heatsink 130 can be larger or smaller than the height of PCB 102, PCB 104 and heat spreader block 146.
- Heat spreader block 146 also acts as a mechanical stabilizer for assembly 100, to provide additional mechanical stability for assemblies 100 that will experience more severe mechanical environments, e.g. vibration.
- FIG. 4C illustrates assembly 100 in an isometric view.
- Heatsink 130 is shown as residing outboard of first PCB 102 and second PCB 104.
- Thermal interface 128 is shown on the opposite side of second PCB 104, and is shown as smaller than second PCB 104 to illustrate the flexibility of the design of the present invention. Airflow can again be provided to increase the heat dissipation capabilities of assembly 100.
- FIGS. 4A-4C can be used where assembly 100 height is at a premium, or, where the heatsink 130 would be more efficient located outboard first PCB 102 and second PCB 104 than it would be if heatsink 130 sat atop second PCB 104. This might occur when it is desirous to locate assembly 100 adjacent to similar assemblies 100 as close as practical to minimize electrical interconnect lengths, where airflow over the top of second PCB 104 is less than airflow outboard of assembly 100. Further, the placement of heatsink 130 outboard first PCB 102 and second PCB 104 allows heatsink 130 to be electrically grounded, or placed at a desired potential, using both first PCB 102 and second PCB 104.
- FIGS. 5 A and 5B illustrate the thermal considerations of a printed circuit board embodying the present invention.
- FIG. 5A illustrates assembly 100 with the various thermal interfaces described for the present invention.
- the silicon die is represented as die 148.
- Thermal Interface 1
- Thermal Interface (Til) 172 is the thermal interface internal to the device 108 between device heatspreader 178 and silicon die 148. Heatspreader 178 may not always be present in which case thermal interface 172 would be used to represent the thermal resistance of the outside package surface to the silicon die 148, e.g. molding compound.
- Thermal Interface 2 (TI2) 174 is the interface between second PCB 104 and device 108.
- Thermal Interface 3 (TI3) 176 is the interface between second PCB 104 and heatsink 130.
- Plated through holes (PTH) 180 is the area 124 of PCB 104 that allows thermal conduction through the board 104.
- Heatsink (HSK) 130 is the device that couples the heat flow to the air or in some cases to thermal pipes to remote radiators.
- FIG. 5B illustrates the thermal schematic for the assembly 100 shown in FIG.
- Til 172 receives a thermal resistance value
- HS1 178 receives a thermal resistance value theta HS1 (6 ⁇ 188, TI2 174 receives a thermal resistance value
- theta TI2 Q ⁇ 190, HV 180 receives a thermal resistance value
- TI3 176 receives a thermal resistance value
- HSK 130 receives a thermal resistance value, theta HSK 202.
- the thermal resistances of the assembly 100 are determined in terms of degrees centigrade per watt ( C/W). To deterrnine the total temperature rise across the interface from silicon die 148 to ambient air, the total power of the device is multiplied by the total thermal resistance:
- FIG. 6 illustrates a flow chart describing the steps used in practicing the present invention.
- Block 204 represents the step of mounting a heat generating device on a first printed circuit board.
- Block 206 represents the step of thermally coupling the heat generating device to a heatsink coupled to a second printed circuit board, wherein a thermal path passes through the second printed circuit board.
- Assembly 100 can have both rigid and flexible layers to accommodate the needs of PCB designers without departing from the scope of the present invention. Further, the thicknesses of assembly 100 can be modified to accommodate components as needed.
- the present invention can also be used to shield device 108 from outside radiative effects, e.g., radiation, electromagnetic interference, etc. Further, device 108 can be shielded from emitting radiation and/or electromagnetic signals to the outside world through the use of the present invention.
- the present invention can also be used to provide power to devices through the second PCB 104 by contacting the device 108 through spacers 124 or standoffs 122.
- the present invention discloses an encapuslated circuit assembly and a method for making such an assembly.
- the assembly comprises a first printed circuit board, a second printed circuit board, and a heat transfer device.
- the second printed circuit board comprises a heatsink, and the heat transfer device couples between a device mounted on the first printed circuit board and the second printed circuit board for transferring heat from the device to the heatsink of the second printed circuit board.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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AU59032/00A AU5903200A (en) | 1999-07-15 | 2000-06-28 | Encapsulated packaging in between 2 pcbs |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US09/353,428 US6304450B1 (en) | 1999-07-15 | 1999-07-15 | Inter-circuit encapsulated packaging |
US09/353,428 | 1999-07-15 |
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WO2001006821A1 true WO2001006821A1 (en) | 2001-01-25 |
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PCT/US2000/018081 WO2001006821A1 (en) | 1999-07-15 | 2000-06-28 | Encapsulated packaging in between 2 pcbs |
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US (2) | US6304450B1 (en) |
AU (1) | AU5903200A (en) |
WO (1) | WO2001006821A1 (en) |
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US9116222B1 (en) | 2010-11-18 | 2015-08-25 | Raytheon Company | Modular architecture for scalable phased array radars |
US8355255B2 (en) | 2010-12-22 | 2013-01-15 | Raytheon Company | Cooling of coplanar active circuits |
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WO2017062095A1 (en) * | 2015-10-05 | 2017-04-13 | Raytheon Company | Scalable thermal solution for high frequency panel array applications or other applications |
US9942975B2 (en) | 2015-10-05 | 2018-04-10 | Raytheon Company | Scalable thermal solution for high frequency panel array applications or other applications |
Also Published As
Publication number | Publication date |
---|---|
AU5903200A (en) | 2001-02-05 |
US20010038527A1 (en) | 2001-11-08 |
US6304450B1 (en) | 2001-10-16 |
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