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TPS63700: TPS63700 output voltage problem at low temperature

Part Number: TPS63700


I used with output voltage -13.85V.

Please see attached the circuit.

I got problems output voltage at low temp.

It is working  -14V under at around 0 degree.

I hope to keep -13.85V up to -40 degrees.

What are the critical factors affecting temperature?

What should I fix to resolve this problem?

Please help me. Thanks.