Two-Stage eFuse Circuit for Surge and EOS Power Path Protection
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Solution Overview
Problem
Existing power path protection devices, such as discrete fuses and electronic fuses, face challenges in effectively managing inrush current, reverse current, overvoltage events, and electrical overstress, leading to unnecessary failures and increased complexity and cost due to the need for additional components.
Innovation Solution
An integrated power path protection circuit with a two-stage fuse assembly and internal clamps, including a passive gate driver, shunt switches, and diodes, which detects surge and EOS events and causes internal or external fuses to fail open, providing controlled protection and reducing part count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discrete fuses are used for power path protection, then circuit protection is provided, but device complexity and component count increase
Solution Approach 1:
The patent combines multiple protection functions (power path protection, surge protection, EOS protection) into a single integrated circuit device. The eFuse circuit is integrated with surge protection circuitry and EOS protection circuitry, eliminating the need for separate discrete fuse components and reducing overall device complexity while maintaining comprehensive protection capabilities.
2Reliability
If traditional power path protection devices are used, then basic protection is provided, but response time to surge and EOS events is insufficient
Solution Approach 1:
The circuit incorporates preliminary protection mechanisms through integrated surge protection circuitry and EOS protection circuitry that are always active and ready to respond. The circuit includes detection mechanisms that continuously monitor for surge and EOS conditions, enabling immediate response without waiting for external detection or manual intervention.
3Measurement precision
If additional components are added to improve protection performance, then protection accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent integrates multiple protection functions into a single circuit device, reducing the total component count and assembly complexity. By combining eFuse circuitry with surge protection and EOS protection in one integrated package, the manufacturing process is simplified while maintaining high protection accuracy through dedicated detection and response circuits for each protection function.
Data Source
AI summary
An example integrated circuit includes: a substrate and a first metal fuse layer on the substrate, the first metal fuse layer having first and second electrical contacts, the first electrical contact adapted to be coupled to an input terminal, the second electrical contact adapted to be coupled to a diode. The example integrated circuit further includes a second metal fuse layer on the substrate, the second metal fuse layer having third and fourth electrical contacts, the third electrical contact coupled to the second electrical contact and adapted to be coupled to the diode, the fourth electrical contact coupled to a shunt circuit.