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TPS53681: TPS53681 12V/5V/3.3V power-up sequence

Part Number: TPS53681

Hi:

in the datasheet power-up recommendations 3.3V->5.0V>12V,but in our application 5.0V and 3.3V power supply is generated by 12V power supply,so power-up discontent datasheet recommendations

What are the problems and risks in this situation?

thanks