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TPS61088: Strange performance for isolation FET

Part Number: TPS61088

Hi Team,

I conduct EN on test on TPS61088 EVM with default setup and 3.6Vin.

When I connect EN to 0V, the isolation FET is ON instead of shutting down after 74ms of getting EN to low logic, which is quite different with description on datasheet.

Could you please tell me the reason behind such phenomenon?