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LM27403: When VIN fall to under 4.3V

Guru 11170 points
Part Number: LM27403

Hello E2E,

Our customer is using the LM27403 for new product. It will start mass production soon. However, they have issue.
When VIN fall to under 4.3V instantly that Vout is to be rise up about 0.6V. Does TI have causes and countermeasures?

Regards,
ACGUY