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BQ40Z80: DMOS damage problem

Part Number: BQ40Z80

Hi

The customer design with BQ40Z80 with 6 series cells.

The discharge current is 5A. When the CUV protection is triggered after discharge, the discharge MOS will break down, causing a short circuit and invalidating the undervoltage protection. What are the reasons for DMOS breakdown?

Attached the schematic.

Please help check it.

Thanks

Star