BGA Power Channel Layout for Uniform Current Distribution
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Solution Overview
Problem
High-power semiconductor devices face issues with non-uniform current distribution in Ball Grid Array (BGA) packages, leading to electro-migration and bottlenecks, which affect the efficiency and reliability of current management.
Innovation Solution
A power channel connection plane with varying resistance values and incremental apertures (voids) is introduced, allowing for a more uniform current distribution by modulating resistance from the periphery to the center, reducing the number of balls involved in power supply and optimizing package size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform connection plane layer is used, then the manufacturing is simple, but the current distribution becomes non-uniform causing electro-migration issues
Solution Approach 1:
The connection plane layer is designed with non-uniform properties: voids are strategically positioned and sized to create different resistance characteristics in different regions. The voids have progressively smaller dimensions from the periphery toward the center, creating locally varied resistance values that guide current distribution uniformly across the ball array.
Solution Approach 2:
The resistance parameter of the connection plane layer is deliberately varied by introducing voids with different dimensions. The voids create resistance values that change progressively from the periphery to the center, transforming the uniform resistance characteristic into a graded resistance profile that equalizes current density across all balls.
2Reliability
If the resistance is varied to achieve uniform current distribution, then the current distribution improves, but the device complexity increases
Solution Approach 1:
The connection plane layer is segmented by introducing multiple voids at different positions and with different dimensions. These voids divide the continuous conductive path into multiple parallel current paths with different resistance characteristics, enabling uniform current distribution while maintaining a relatively simple overall structure.
Solution Approach 2:
The voids are designed with asymmetric dimensions and positions rather than uniform symmetric patterns. The voids progressively decrease in size from periphery to center, creating an asymmetric resistance profile that is specifically tailored to compensate for the natural current crowding effect in BGA packages.
3Power
If more balls are involved in power supply to ensure adequate power delivery, then the power delivery capacity increases, but the package size increases
Solution Approach 1:
The invention creates multiple current paths that effectively 'copy' the power delivery function across different regions of the connection plane. By distributing current uniformly through multiple balls via the void-patterned connection plane, the system achieves adequate power delivery capacity without requiring an increased number of power balls or larger package area.
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 solution achieves a more uniform current distribution among BGA power-channel balls, reducing local current density and package size while maintaining cost-effectiveness without additional manufacturing processes.
Implementation Method 1
A power channel connection plane with varying resistance values and incremental apertures (voids) is introduced, allowing for a more uniform current distribution by modulating resistance from the periphery to the center
Data Source
AI summary
A semiconductor die is mounted at a die area of a ball grid array package that includes an array of electrically-conductive ball. A power channel conveys a power supply current to the semiconductor die. The power channel is formed by an electrically-conductive connection plane layers extending in a longitudinal direction between a distal end at a periphery of the package and a proximal end at the die area. A distribution of said electrically-conductive balls is made along the longitudinal direction. The electrically-conductive connection plane layer includes subsequent portions in the longitudinal direction between adjacent electrically-conductive balls of the distribution. Respective electrical resistance values of the subsequent portions monotonously decrease from the distal end to the proximal end. A uniform distribution of power supply current over the length of the power channel is thus facilitated.