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TPS51200: Startup Sequence

Part Number: TPS51200

Hello E2E,

I have a question regarding power supply sequencing for the TPS51200.

Does the sequence (Fig 19 and 20 in the datasheet) have to be followed?

The datasheet notes that VLDOIN can come up before VIN as an alternative to Fig 19 and 20 sequence. 

What about if VIN, REFIN, and VLDOIN all came up and the same time? Would that be ok?

Regards,

Russell