TPS546D24A: Power Rail / Enable application order - AVIN/PVIN/VDD5/ENB

Bradley Higgins

Prodigy 20 points

Part Number: TPS546D24A

From the Datasheet the following sentence,

Would imply that the three power rails and the enable can be applied in any order without creating issues.

The power supply recommendations do not list any order requirements.

Are there any power up scenarios that should be avoided?

over 3 years ago

0 Vincent Zhang(BSR) over 3 years ago

TI__Expert 4795 points

Hi Bradley,

We’re looking at this and will feedback to you next week.

0 Peter James Miller over 3 years ago

TI__Mastermind 48240 points

Bradley Higgin

PVIN, AVIN, and VDD5 can be powered up in any order, the one restriction is that an external supply provided to VDD5 should not draw current from VDD5 if AVIN will be powered before VDD5. They may require a diode, external MOSFET when powering VDD5 from an external 5V source that also powers other circuits to prevent VDD5 from attempting to drive these additional external circuits when AVIN is present and the external supply powering VDD5 is not.

0 Bradley Higgin over 3 years ago in reply to Peter James Miller

Intellectual 525 points

Took me a second to figure out that this thread was started by "Bradley HigginS", while I'm "Bradley Higgin" and was just tagged incorrectly. Good luck, guys!

0 Peter James Miller over 3 years ago in reply to Bradley Higgin

TI__Mastermind 48240 points

Bradley Higgin

My apologies about that, I thought I tagged Bradley Higgins, I must have clicked on the wrong name.

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TPS546D24A: Power Rail / Enable application order - AVIN/PVIN/VDD5/ENB