TPS2553: Reverse current protection issue

Iurii Vostrenkov

Part Number: TPS2553

Tool/software:

Hi, I'm testing my design with TPS2553 to withstand reverse current condition and I can not see it working as described..

Here's the result I get (VOUT 5.6V applied after VIN 5.2V), it is repeated with two different ICs:

closeup view of VOUT insertion:

Here's a part of my schematic with test condition notes:

Visual look of the IC:

Any thoughts what might be an issue with this design are very appreciated

Thanks in advance

Yury

5 months ago

0 Chuck Branch 4 months ago

TI__Mastermind 32751 points

Yury,

I am reviewing this result now and will get back to you later tdoay.

Regards,

Chuck

0 Iurii Vostrenkov 4 months ago in reply to Chuck Branch

Prodigy 20 points

Thank you Chuck!

Did you have a chance to take a look yet?

Regards,

Yury

0 Chuck Branch 4 months ago in reply to Iurii Vostrenkov

TI__Mastermind 32751 points

Yury,

I do not see anything about your circuit that would prevent the device from properly turning off.

I am going to request an EVM for this device to repeat you testing on my end. I have not seen this failure before. It will take a couple of days for me to get the EVM in house to do the testing.

Regards,

Chuck

0 Iurii Vostrenkov 4 months ago in reply to Chuck Branch

Prodigy 20 points

Thank you for the effort!
I'm looking forward to the results of your testing

Regards,
Yury

+1 Chuck Branch 4 months ago in reply to Iurii Vostrenkov

TI__Mastermind 32751 points

Yuri,

I was able to find an EVM and I will be able to get into the lab tomorrow for testing.

I will send an update as soon as I am able.

Regards,

Chuck

0 Iurii Vostrenkov 4 months ago in reply to Chuck Branch

Prodigy 20 points

Hi Chuck,

I repeated my tests fully isolating my circuit from board supply and consumers. Removed inductors L1002 and L1003 and connected my laboratory PSU channels to IC input and output (EN is shorted to input voltage as well).

I get just the same result in these conditions..

Were you able to perform some tests from your side?

P.S. I accidentally smashed Resolve instead of Reply Could you reopen this please?