Abstract:
A method of making a fluid cooled microelectronic package (10'/60') in which fluid is circulated through the package in fluid-carrying channels (40/64) defined at least in part by voids in an encapsulant (38) that surrounds the package components (12, 14, 16). Preferably, the encapsulant channels (40/64) are defined in part by heat producing components (12, 14, 16) of the package so that coolant fluid directly contacts such components. The coolant fluid can be electrically conductive or non-conductive depending on the type of components being cooled. The coolant channels (40) are formed by insert-molding a form (24) in the encapsulant (38), and removing the form (24) following the molding process. Alternately, the encapsulant is formed in two or more pieces (38a, 38b) that are joined to form the package (60'), and the coolant channels (64) are defined by recesses (62) formed in at least one of the encapsulant pieces (38a, 38b).
Abstract:
An electronic package (10) having enhanced heat dissipation is provided exhibiting dual conductive heat paths (40, 42) in opposing directions. The package (10) includes a substrate (18) and a semiconductor device (12) mounted to the substrate (18). The semiconductor device (12) has electrical circuitry a first surface, and a second surface oppositely disposed from the first surface. A thermally conductive heat sink (30) is assembled over the semiconductor device (12) such that a cavity (32) is formed between the semiconductor device (12) and the heat sink (30). A thermally conductive and electrically insulative material (36) is disposed in the cavity (32) between the semiconductor device (12) and the heat sink (30).
Abstract:
A heat dissipating component (10) including a heat-generating device (12) such as a power semiconductor chip and mounting structure (14) is provided with coolant channels (18) having a stair-stepped internal geometry that enhances cooling performance with both single-phase and two-phase cooling modes without unduly restricting coolant flow or significantly increasing manufacturing cost. The stair-stepped geometry enhances both single-phase and two-phase cooling modes by increasing the surface area of the channels (18), and further enhances the two-phase cooling mode by providing numerous high-quality bubble nucleation sites along the length of the channels (18). The stair-stepped channels (18) are formed in the heat-generating device (12) and/or the mounting structure (14), and the stepped sidewalls (19a, 19b) may extend toward or away from the center of the channel (18).
Abstract:
An electronic package (10) and packaging method in which integral convective fins are formed of portions of a leadframe (14) from which electrical leads (18) are also formed. The leadframe (14) comprises a base (16) and first and second sets of leads (18,28) extending from the base (16). The first set of leads (18) is separated from the base (16) and from the second set of leads (28), such that each lead of the first set has an interior end adjacent but separate from the base (16), and each lead of the second set has an interior portion that remains attached to the base (16). A circuit device (12) is mounted to the base (16) and electrically connected to the interior ends of the first set of leads (18). The device (12), base (16), and interior ends and portions of the leads are then encased within a housing (26). Exterior ends of the leads remain outside the housing (26) as package (10) terminals and thermal dissipaters.
Abstract:
A heat dissipating component (10) including a heat-generating device (12) such as a power semiconductor chip and mounting structure (14) is provided with coolant channels (18) having a stair-stepped internal geometry that enhances cooling performance with both single-phase and two-phase cooling modes without unduly restricting coolant flow or significantly increasing manufacturing cost. The stair-stepped geometry enhances both single-phase and two-phase cooling modes by increasing the surface area of the channels (18), and further enhances the two-phase cooling mode by providing numerous high-quality bubble nucleation sites along the length of the channels (18). The stair-stepped channels (18) are formed in the heat-generating device (12) and/or the mounting structure (14), and the stepped sidewalls (19a, 19b) may extend toward or away from the center of the channel (18).
Abstract:
An electronic device (10) is provided having a bimetallic fluid circulator (30) for circulating fluid coolant in relation to electrical circuitry (22) to provide enhanced heat exchange. The fluid circulator (30) includes a first thin sheet (32) exhibiting a first coefficient of thermal expansion (CTE) and the second thin sheet (34) dissimilar from the first thin sheet (32) and exhibiting a second CTE that is substantially different than the first CTE. The first and second thin sheets (32, 34) are bonded together. The first and second thin sheets (32, 34) expand and contract at different rates based on changes in temperature such that the first and second thin sheets (32, 34) change shape to create a fanning motion to circulate the fluid and thus cool the electrical device (22).
Abstract:
The present invention relates to the cooling of electronic components such as CD or DVD players and recorders and the disc or discs within. Specifically, the present invention relates to the internal cooling of a disc playing or recording device and the disc or discs within.
Abstract:
A cooled electronic assembly includes an integrated-circuit device carrier (such as a printed circuit board), a device (such as a flip chip), a liquid pump, a molding material, a heat exchanger, and a cover. The device and the liquid pump are electrically connected to the integrated-circuit device carrier. The molding material is molded to the device, to the liquid pump, and to the integrated-circuit device carrier. The cover has a coolant channel fluidly connected to the heat exchanger, wherein the cover is attached to the molding material. The coolant channel and the heat exchanger together at least partially define a closed coolant circuit. The liquid pump is operatively connected to the closed coolant circuit. A method for cooling a printed circuit board includes placing a liquid coolant in the closed coolant circuit and electrically activating the liquid pump through the printed circuit board.
Abstract:
An electronic assembly (100) with integral thermal transient suppression includes an integrated circuit (IC) chip (106) disposed within a cavity (103) of an IC device package (102). A transient thermal suppression material (TTSM) (110) is disposed in the cavity (103) in thermal contact with the IC chip (106). A heat sink (112) may also be provided in thermal contact with the chip (106). When present, the heat sink (112) serves as a cover of the packaged IC chip (106) and may include fins (112A,112B) extending from an upper surface (in contact with air) and a lower surface (in thermal contact with the TTSM (110)).The TTSM (110) may be thought of as a phase change material that absorbs energy dissipated by the IC chip (106) in a phase change event.
Abstract:
An encapsulated microelectronic package includes a fluid conducting cooling tube (22) directly coupled to one or more semiconductor chips (12, 14, 16), with the encapsulant (34) being molded over the semiconductor chips (12, 14, 16) and portions of the cooling tube (22) in proximity to the semiconductor chips (12, 14, 16). The encapsulant (34) immobilizes the cooling tube (22) with respect to the semiconductor chips (12, 14, 16), and the cooling tube (22) and encapsulant (34) are designed to minimize differences in their coefficients of thermal expansion relative to the semiconductor chips (12, 14, 16).