Active Silicon Package Stacking With Interposer Heat Paths
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Solution Overview
Problem
Package-on-package (PoP) semiconductor stacks face challenges with heat dissipation due to reduced heat transfer, leading to hot spots and premature failure, as existing technologies struggle to effectively manage thermal conductivity across stacked packages.
Innovation Solution
A package-on-silicon (PoS) semiconductor package design where a first semiconductor package is conductively coupled to an active silicon substrate using interconnects in a high-density pattern, and a second semiconductor package is coupled using conductive members or wirebonds in a lower-density pattern, with an optional interposer layer for thermal conductivity enhancement, facilitating heat dissipation through a high thermal conductivity adhesive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If semiconductor packages are stacked vertically in PoP configuration, then board area is reduced and signal propagation is improved, but heat dissipation is reduced leading to hot spots and premature failure
Solution Approach 1:
An interposer substrate is introduced as an intermediary component between the stacked semiconductor packages. The interposer contains through-silicon vias (TSVs) that serve as thermal pathways, mediating heat transfer from upper to lower packages while maintaining the compact PoP vertical stacking configuration on the board
Solution Approach 2:
The patent employs composite material structures including the interposer substrate combining silicon layers with conductive via materials, and thermal interface materials with high thermal conductivity. This composite approach creates optimized thermal pathways that dissipate heat effectively while maintaining the compact stacked package structure
2Strength
If packages are physically and conductively coupled via reforming, then mechanical and electrical connection is achieved, but heat transfer is reduced within the stack
Solution Approach 1:
The interposer substrate acts as a thermal intermediary that redirects heat flow. While mechanical coupling provides electrical connection, the TSVs embedded in the interposer create dedicated thermal pathways that bypass the limitations of direct package-to-package thermal coupling, enabling efficient heat extraction without compromising mechanical strength
Solution Approach 2:
The patent transitions from planar heat dissipation to three-dimensional thermal management by utilizing vertical TSV pathways through the interposer. This dimensional approach creates additional thermal conduction routes that extend through the stacked package structure, improving heat transfer in the vertical dimension while maintaining mechanical coupling
3Area of stationary object
If heat is dissipated through a relatively small area in PoP stack, then compact structure is maintained, but hot spots form and reliability decreases
Solution Approach 1:
The thermal management system is segmented into multiple independent heat dissipation pathways through the TSV array in the interposer. Rather than relying on a single heat sink, the segmented via structure distributes thermal load across multiple parallel conduction paths, preventing localized hot spots and improving overall package reliability
Solution Approach 2:
The interposer provides localized thermal management quality by concentrating high thermal conductivity materials specifically at critical heat generation points within the stack. The TSVs are strategically positioned to address local hot spots, creating non-uniform thermal conductivity distribution that optimizes heat extraction from high-power regions while maintaining compact overall structure
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
This design enhances thermal distribution and heat dissipation across the PoP semiconductor package, reducing the risk of hot spots and extending the lifespan of the package by effectively managing thermal conductivity between stacked components.
Implementation Method 1
heat dissipation through a high thermal conductivity adhesive
Data Source
AI summary
Systems and methods for providing a low profile stacked die semiconductor package in which a first semiconductor package is stacked with a second semiconductor package and both semiconductor packages are conductively coupled to an active silicon substrate that communicably couples the first semiconductor package to the second semiconductor package. The first semiconductor package may conductively couple to the active silicon substrate using a plurality of interconnects disposed in a first interconnect pattern having a first interconnect pitch. The second semiconductor package may conductively couple to the active silicon substrate using a plurality of interconnects disposed in a second interconnect pattern having a second pitch that is greater than the first pitch. The second semiconductor package may be stacked on the first semiconductor package and conductively coupled to the active silicon substrate using a plurality of conductive members or a plurality of wirebonds.