TPS65131: How to protect LDOs /Upstream TPS65131 during reverse polarity/reverse current

Abigail Leonardi

Part Number: TPS65131
Other Parts Discussed in Thread: LP5907

Tool/software:

Hi,

My customer is wondering what TI recommends to protect LDOs /Upstream TPS65131 during reverse polarity/reverse current situations as seen in situations like TI's reference design here - https://www.ti.com/lit/ug/tidu996/tidu996.pdf?ts=1733955916249&ref_url=https%253A%252F%252Fwww.google.com%252F

Please let me know if you have standard recommendations, thanks!

15 days ago

0 Patrick Yao 14 days ago

TI__Mastermind 29560 points

Hi Abigail,

Do you mean to protect LP5907 and TPS72301?

Patrick

0 Abigail Leonardi 14 days ago in reply to Patrick Yao

TI__Intellectual 2235 points

Yes, I believe that would be the goal

0 Patrick Yao 12 days ago in reply to Abigail Leonardi

TI__Mastermind 29560 points

Hi Abigail,

Is it because the load will somehow generate the reverse current?

My understanding is that usually the reverse current will also charge the output caps of the LDO, so the output voltage will be raised up a little and then be regulated by LDO loop.

Patrick

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

Power management

Power management forum

TPS65131: How to protect LDOs /Upstream TPS65131 during reverse polarity/reverse current