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TPS53681: TPS53681 can not start at -40C

Part Number: TPS53681

Dear Team,

customer is using TPS53681 for Radio design, and they found TPS53681 can not work at -40C.

at -40C, Vin12V, and Vout 5.35V is ok and Vout 0.85V can not work.

if TI has any solution ready to resove the issue for low temperature start?