ESD Protection in Multi-Domain Gate Driver ICs
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Solution Overview
Problem
High voltage gate driver circuits face challenges in providing electrostatic discharge (ESD) protection across multiple voltage domains without increasing silicon area and cost, as larger voltage ratings require more die area for ESD devices.
Innovation Solution
The integration of a gate driver IC with a high-side region, low-side region, and low-voltage region, each with dedicated electrostatic devices, where the high-side and low-side ESD devices are coupled in series to share protection, reducing the overall silicon area and cost by using smaller ESD devices across multiple voltage domains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If larger voltage rating ESD devices are used to provide ESD protection across multiple voltage domains, then ESD protection capability is improved, but die area and cost increase
Solution Approach 1:
The patent divides the ESD protection system into multiple separate ESD devices, each designed for a specific voltage domain (HV domain with first ESD device, LV domain with second ESD device). Each ESD device is optimized for its respective voltage range, allowing them to be smaller and more efficient than a single high-voltage device covering all domains. The termination region further segments the circuit to electrically isolate the voltage domains, enabling independent ESD protection for each segment.
Solution Approach 2:
The patent applies different ESD protection characteristics to different parts of the circuit based on their voltage requirements. The first ESD device in the HV domain is designed with properties suitable for high voltage operation, while the second ESD device in the LV domain is optimized for low voltage operation. This localized optimization allows each ESD device to be minimally sized for its specific function, reducing total die area compared to using a single high-voltage-rated device throughout.
2Reliability
If larger voltage rating ESD devices are used to provide ESD protection across multiple voltage domains, then ESD protection capability is improved, but cost increases
Solution Approach 1:
The patent segments the ESD protection function into multiple voltage-domain-specific devices, allowing each to be manufactured with optimized processes for its voltage range. This avoids the need to manufacture expensive high-voltage-rated devices for all applications, reducing overall manufacturing cost while maintaining adequate ESD protection in each domain.
Solution Approach 2:
By tailoring the ESD device characteristics to local voltage domain requirements, the patent enables cost-effective manufacturing. Low-voltage domains use inexpensive LV ESD devices, while only the necessary high-voltage portions use HV ESD devices, minimizing the use of expensive high-voltage technology throughout the entire circuit.
3Device complexity
If a single high-voltage ESD device is used for all voltage domains, then ESD protection is simplified, but device complexity increases due to voltage domain isolation requirements
Solution Approach 1:
The patent uses the termination region to segment and electrically isolate the HV and LV voltage domains. This physical and electrical segmentation allows multiple ESD devices to operate independently in their respective domains without interference, achieving reliable voltage domain isolation while maintaining a relatively simple overall configuration compared to trying to protect all domains with a single complex high-voltage device.
Data Source
AI summary
A gate driver integrated circuit includes a high-side region that operates in a first voltage domain according to a first pair of supply terminals that include a first lower supply terminal and a first higher supply terminal; a low-side region that operates in a second voltage domain according to a second pair of supply terminals; at least one termination region that electrically isolates the high-side region from the low-side region; a first electrostatic device arranged in the high-side region and connected to the first pair of supply terminals; a second electrostatic device arranged in the low-side region and connected to the second pair of supply terminals; and a third electrostatic device connected to a lower supply terminal of the first pair of supply terminals and is coupled in series with the first electrostatic device.