MOSFET Sense Switch Layout for Shared Current and DESAT Protection
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Solution Overview
Problem
Existing current sensing systems and DESAT systems require separate layouts for switching elements, complicating the integration of multiple protection circuits without altering the switching element layout.
Innovation Solution
A semiconductor device with integrated main and sense switching elements, where the sense switching element has a smaller area and is positioned between the gate and source terminals of the main switching element, allowing for the sharing of a single layout for multiple protection circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate layouts are created for current sense circuit and DESAT circuit, then each protection circuit can be properly implemented, but device complexity and layout complexity increase
Solution Approach 1:
The patent combines the sense switching element layout into a single configuration that serves both the current sense circuit and DESAT circuit. The sense switching element is positioned between the gate terminal and source terminal of the main switching element, allowing both protection circuits to share the same physical layout structure, thereby reducing overall device complexity while maintaining dual protection functionality
Solution Approach 2:
The sense switching element is designed with multi-functionality to support both current sensing and DESAT protection operations. By configuring the sense switching element to be controllable by both the current sense control circuit and the DESAT control circuit, a single layout serves multiple protection purposes, eliminating the need for separate dedicated layouts for each protection mechanism
2Area of moving object
If sense switching element is integrated into main switching element, then area is reduced, but layout flexibility for different protection circuits is limited
Solution Approach 1:
The sense switching element is designed with dynamic controllability, allowing its operation to be adjusted based on the specific protection circuit requirements. The gate terminal of the sense switching element can be controlled by different control circuits (current sense or DESAT) depending on the operational mode, providing adaptability within the integrated compact structure
Solution Approach 2:
The switching element is segmented into main switching element and sense switching element with distinct functional regions. The sense switching element occupies a smaller area and is strategically positioned between the gate and source terminals, creating functional segmentation that enables both compact integration and flexible control for different protection circuits
Data Source
AI summary
A plurality of systems of protection circuits are supported without changing a layout in a switching element. A semiconductor device includes a main switching element including a MOSFET and a sense switching element having a smaller area in plan view than the main switching element and for detecting current flowing through the main switching element. A first gate terminal that is a gate terminal of the sense switching element is arranged between a second gate terminal that is a gate terminal of the main switching element and a source terminal of the sense switching element.