MMC Module Insulation Layout for Leakage Current Suppression
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Solution Overview
Problem
Conventional magnetic-molding compound (MMC) fillers in IC modules cause undesirable leakage current due to metallic particles between the IC die and other components, leading to potential module failure.
Innovation Solution
Incorporating an insulative layer between the IC die and the leadframe, with controlled gap thickness to limit MMC filler particle size, thereby reducing leakage current by insulating the contact pads and limiting the MMC filler to smaller, non-conductive particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If magnetic-molding compound (MMC) filler is used to form the magnetic core, then energy storage capacity is enhanced, but leakage current increases due to metallic particles
Solution Approach 1:
The gap between the IC die and leadframe is segmented into multiple regions by introducing an insulative layer, which divides the MMC filler into smaller particles that cannot bridge the insulative layer, thereby preventing leakage current paths while maintaining magnetic core functionality
Solution Approach 2:
An insulative layer is introduced as an intermediary between the IC die and leadframe, preventing direct contact between metallic MMC particles and conductive surfaces, thus eliminating leakage current while allowing the MMC filler to maintain its energy storage function
2Object-generated harmful factors
If insulative layer is added to prevent leakage current, then leakage current is reduced, but device complexity increases
Solution Approach 1:
The insulative layer is merged with the existing gap structure between the IC die and leadframe, combining the insulation function with the existing physical spacing, thereby preventing leakage current without significantly increasing device complexity
Solution Approach 2:
The thickness and material properties of the insulative layer are optimized to provide sufficient insulation against leakage current while maintaining compatibility with existing manufacturing processes and device dimensions, thus preventing leakage without excessive complexity
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 solution effectively reduces leakage current, enhancing energy storage capacity and preventing early module failure by suppressing leakage paths through controlled insulation and MMC filler particle size.
Implementation Method 1
an insulative layer between the solder elements... effectively reduces leakage current... by insulating the contact pads
Data Source
AI summary
A module includes: an integrated circuit (IC) die; a leadframe having contact pads; solder elements coupled between the IC die and the contact pads; an insulative layer between the solder elements; and magnetic-molding compound (MMC) filler between the IC die and the leadframe.