Vertical Hall Sensor Heat Slug Layout for High-Current Packaging
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Solution Overview
Problem
Current sensors for high voltage applications face challenges in packaging and performance, requiring bulky packages and non-standard footprints to accommodate high current levels, which complicates integration and increases costs.
Innovation Solution
The design incorporates a metal heat slug with three portions, where the semiconductor die is attached to the third portion to measure current, and the package structure encloses the die and exposes the first and second portions of the heat slug, allowing for standard packaging and high current sensing without the need for thick lead frames or non-standard connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional current sensing methods are used for high voltage applications, then high current levels can be accommodated, but bulky packages and nonstandard package footprints are required
Solution Approach 1:
The patent merges the current sensing function with the power delivery function by integrating the semiconductor die onto the heat slug itself. The heat slug serves dual purposes: as the current carrying conductor and as the mounting substrate for the sensing die, eliminating the need for separate bulky packaging structures.
Solution Approach 2:
The heat slug is designed to perform multiple functions simultaneously: it acts as the current conductor, the thermal management component, and the mechanical support structure for the semiconductor die. This multi-functionality reduces the overall package complexity and size.
2Reliability
If conventional current sensing methods are used for high voltage applications, then high current levels can be accommodated, but nonstandard package footprints are required
Solution Approach 1:
By making the heat slug the universal mounting platform that combines power delivery and sensing functions, the package can adopt standard footprints while maintaining high current sensing capability. The heat slug's dual role enables compatibility with conventional packaging standards.
3Reliability
If thick lead frames are used to accommodate high current levels, then high current can be handled, but device complexity and cost increase
Solution Approach 1:
The patent eliminates the need for thick lead frames by merging the current conduction function into the heat slug structure itself. The heat slug serves as both the current carrier and the die mounting substrate, simplifying the overall device structure.
4Reliability
If conventional packaging is used, then high current levels can be sensed, but signal-to-noise ratio deteriorates
Solution Approach 1:
The patent extracts the sensing die and places it directly on the heat slug, separating the sensing function from the bulky conventional package structure. This extraction allows for optimized signal routing and reduced interference, improving the signal-to-noise ratio.
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 configuration enables efficient high current sensing in a small form factor with standard lead configurations, reducing complexity and cost, while improving signal-to-noise ratio and allowing for scalable designs without the need for custom tooling.
Implementation Method 1
Vertical high current hall sensor with integrated heat slug current loop power pad
Data Source
AI summary
An electronic device includes a metal heat slug, a semiconductor die, and a package structure. The metal heat slug has a first portion, a second portion, and a third portion, the second portion is spaced apart from the first portion, and the third portion connects the first and second portions. The semiconductor die is attached to the third portion of the metal heat slug to measure a current of the third portion of the metal heat slug, and the package structure encloses the semiconductor die and the third portion of the metal heat slug and exposes sides of the first and second portions of the metal heat slug.