IC Heat Sink Through Passivation Layer Thermal Pathway
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Solution Overview
Problem
Integrated circuits face heat buildup issues due to poor thermal conductivity in packaging materials and increased heat generation from smaller, faster devices, leading to potential damage and reduced lifespan.
Innovation Solution
A packaged integrated circuit design featuring a heat sink with a thermal pathway that extends through the passivation layer and encapsulant, providing enhanced thermal conductivity to dissipate heat more efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the integrated circuit is encapsulated within a package formed of materials that do not conduct thermal energy well, then the integrated circuit is protected from environmental damage, but heat is trapped within the packaged device leading to overheating
Solution Approach 1:
The patent introduces a heat sink as an intermediary component between the integrated circuit and the external environment. The heat sink conducts heat away from the integrated circuit through its thermally conductive material, serving as a mediator that enables heat transfer without requiring the encapsulant material itself to be thermally conductive. This resolves the contradiction by adding a dedicated thermal management component rather than modifying the protective encapsulant.
Solution Approach 2:
The patent segments the thermal management function from the protective encapsulation function. The encapsulant remains responsible for environmental protection while the heat sink handles thermal dissipation. This segmentation allows each component to be optimized for its specific function without compromise - the encapsulant can use insulating materials for protection while the heat sink uses conductive materials for heat dissipation.
2Volume of moving object
If devices are made smaller to increase integration density, then more functionality is achieved in less space, but thermal energy is concentrated in a smaller space making heat dissipation more difficult
Solution Approach 1:
The patent addresses the three-dimensional heat concentration problem by extending the heat dissipation path in the vertical dimension. The heat sink protrudes from the encapsulant surface, creating an extended thermal pathway that moves heat from the concentrated source in the small integrated circuit up through the encapsulant and out through the exposed heat sink surface. This dimensional extension allows effective heat dissipation despite the small footprint of the integrated circuit.
3Speed
If devices operate faster to improve performance, then processing speed increases, but thermal energy is generated at a faster rate causing heat to build up more quickly
Solution Approach 1:
The patent implements continuous heat removal through the heat sink, which operates constantly to conduct thermal energy away from the integrated circuit as it is generated. This continuous thermal management action matches the continuous operation of fast devices, preventing heat accumulation by maintaining a steady-state thermal condition where heat generation equals heat dissipation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The thermal pathway facilitates faster heat dissipation, reducing the risk of overheating and extending the lifespan of integrated circuits by improving thermal transfer rates beyond conventional materials.
Implementation Method 1
A thermal pathway is disposed at least partially within the port, and makes thermal contact to both the underlying layer and the heat sink. The thermal transfer rate of the thermal pathway is greater than the thermal transfer rate of either the passivation layer or the encapsulant.
Data Source
AI summary
A packaged integrated circuit having a thermal pathway to exhaust heat from the integrated circuit. The integrated circuit is disposed on a package substrate, with an encapsulant disposed around the integrated circuit. A heat sink is disposed at least partially within the encapsulant, with at least a portion of one surface of the heat sink exposed outside of the encapsulant. The integrated circuit has an uppermost passivation layer, where the passivation layer is not electrically conductive, with a port disposed in the passivation layer. The port extends completely through the passivation layer to expose an underlying layer. A thermal pathway is disposed at least partially within the port, and makes thermal contact to both the underlying layer and the heat sink. The thermal transfer rate of the thermal pathway is greater than the thermal transfer rate either the passivation layer or the encapsulant.