3D IC TSV Interposer Thermal Management via Vertical Stacking
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Solution Overview
Problem
Conventional 3D IC integration technologies face challenges in thermal management due to increased power generation per unit substrate area, limited design flexibility, and high manufacturing costs associated with Through Silicon Vias (TSVs), which compromise electrical performance and increase the risk of chip overheating.
Innovation Solution
A 3D IC structure utilizing a TSV interposer with high-power chips flip-chip bumped on the top-side and low-power chips attached to the bottom-side, incorporating a heat spreader and heat sink for improved thermal management, and supported by a simple organic substrate, eliminating the need for active circuit elements in the interposer to reduce fabrication costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional 3D IC integration technology is used with TSVs, then vertical integration and signal paths are achieved, but thermal management deteriorates due to increased power generation per unit substrate area
Solution Approach 1:
The patent transitions from conventional planar substrate mounting to three-dimensional vertical stacking with TSV interposers. Multiple chips are stacked vertically and interconnected through TSVs, enabling high-density integration while distributing heat sources across multiple levels. The heat spreader and heat sink extend the thermal management solution into the vertical dimension, effectively dissipating heat from high-power chips without compromising integration density.
Solution Approach 2:
The patent introduces a TSV interposer as an intermediary substrate between the high-power chip and the organic substrate. The interposer contains TSVs that provide both electrical interconnections and thermal pathways. Additionally, a dedicated heat spreader acts as an intermediary thermal management component between the high-power chip and heat sink, distributing heat laterally before vertical dissipation.
2Device complexity
If TSV interposer is used for high-density integration, then wiring density and interconnection are improved, but fabrication cost increases due to TSV manufacturing complexity
Solution Approach 1:
The TSV interposer serves multiple functions simultaneously: it provides high-density electrical interconnections through TSVs, acts as a mechanical support structure for stacking chips, and facilitates thermal management through integrated heat spreading pathways. This multi-functionality reduces the need for separate components and simplifies the overall manufacturing process despite the complexity of TSV fabrication.
Solution Approach 2:
The patent applies TSV technology selectively rather than uniformly across the entire substrate. High-power chips with high integration requirements are mounted on the TSV interposer, while low-power chips can be mounted on simpler substrates. This localized application of complex TSV technology reduces overall fabrication costs while maintaining high wiring density where most needed.
3Productivity
If high-power chips are stacked vertically, then integration density is improved, but thermal management becomes more difficult due to heat accumulation
Solution Approach 1:
The patent implements thermal management in the vertical dimension by stacking the heat sink beneath the TSV interposer and extending heat dissipation pathways downward. This vertical thermal management architecture allows heat to be conducted away from high-power chips through the interposer and dissipated through the heat sink, preventing heat accumulation despite vertical stacking of multiple chips.
Solution Approach 2:
The patent segments the thermal management system into distinct functional zones: high-power chips are separated from low-power chips onto different sides of the interposer, and the heat dissipation pathway is segmented into conduction through the interposer, spreading through the heat spreader, and final dissipation through the heat sink. This segmentation allows optimized thermal management for each chip type and region.
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 management, reduces fabrication costs, and maintains high electrical performance while supporting high-power, high-reliability, low-profile, and small-footprint applications with improved heat dissipation and reduced TSV yield loss.
Implementation Method 1
The back sides of these high-power chips are attached to a heat spreader
Implementation Method 2
A heat sink is further attached to the heat spreader to provide additional cooling
Implementation Method 3
A heat sink is further attached to the heat spreader to provide additional cooling
Implementation Method 4
A thermal interface material (TIM) is used at the interface between the high-power chips and the heat spreader
Data Source
AI summary
An apparatus having a three-dimensional integrated circuit structure is described herein. The apparatus include an interposer for carrying a plurality of high and low-power chips. The high-power chips are attached and connected to one side of the interposer, while the low-power chips are attached and connected to the other side of the interposer. In generally, the high-power chips produce more heat than does the low-power chip during their operations. The interposer further include through silicon vias and redistribution layers for connecting the chips on both surfaces. In addition, the interposer assembly is attached and connected to a substrate layer, which is in turn attached and connected to a printed circuit board. In order to provide improve thermal management, the interposer surface carrying the high-power chips are oriented away from the circuit board. A heat spreader is attached to the back sides of the high-power chips for dissipating the heat.