Monolithic GaN Switch Chip on Lead Frame for DC-DC Converter
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Solution Overview
Problem
Existing dc to dc converter circuits require multiple discrete components, including silicon-based FETs and integrated circuit drivers, which occupy significant space on printed circuit boards and are cumbersome to assemble, necessitating a more compact and simplified design.
Innovation Solution
A monolithic GaN-based chip containing multiple switch elements and an optional integrated IC driver is mounted on a common lead frame, allowing for a reduced part count and smaller footprint, enabling easier assembly and reduced board area usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple discrete components (silicon-based FETs and IC drivers) are used in dc to dc converter circuits, then the circuit functionality is achieved, but the board area occupancy and assembly complexity increase
Solution Approach 1:
The patent combines multiple discrete components (GaN-based switch devices and IC driver) into a single integrated chip. This merging reduces the part count and simplifies assembly operations, directly addressing the contradiction between ease of manufacture and device complexity.
Solution Approach 2:
The integrated chip serves multiple functions simultaneously - it contains both the GaN-based switch devices and the IC driver circuitry, allowing a single component to perform what previously required multiple separate components. This multi-functionality reduces board area and assembly complexity while maintaining full circuit functionality.
2Productivity
If multiple discrete components are used in dc to dc converter circuits, then the circuit functionality is achieved, but the board area occupancy increases
Solution Approach 1:
By merging the GaN-based switch devices and IC driver into a single integrated chip, the patent significantly reduces the board area required for the converter circuit. This consolidation eliminates the space needed for multiple separate components and their interconnections.
Solution Approach 2:
The patent transitions from a distributed arrangement of multiple discrete components across the board to a concentrated three-dimensional integration within a single chip. This dimensional consolidation reduces the two-dimensional board footprint while maintaining all necessary circuit functions.
3Reliability
If silicon-based FETs are used in converter circuits, then the circuit operates reliably, but the device size and heat management requirements increase
Solution Approach 1:
The patent changes the material parameter from silicon-based FETs to GaN-based switch devices. This material substitution fundamentally alters the thermal and electrical characteristics, enabling higher efficiency operation with reduced heat generation while maintaining circuit reliability.
Solution Approach 2:
The use of GaN (gallium nitride) compound semiconductor material represents a transition to composite/advanced materials that combine superior electrical properties with improved thermal management characteristics, resolving the contradiction between reliability and temperature control.
Data Source
AI summary
A multichip module defining a dc to dc converter employs a monolithic chip containing at least two III-nitride switches (a monolithic CSC chip) mounted on a conductive lead frame. The CSC chip is copacked with an IC driver for the switches and with the necessary passives. The module defines a buck converter; a boost converter, a buck boost converter, a forward converter and a flyback converter. The drain, source and gate pads of the monolithic CSC chip are connected to a lead frame by solder or epoxy or by bumping attach and a conductive connector or wire bonds connect the switch terminal to lead frame.