TPS22810: Misuse the input and output

BX27

Part Number: TPS22810

hi there, we found a mistake in SCH design. The output pin1 is connected to input Power D3V3_IN, and pin6 is used as output. Downstream load of D3V3_Switch_OUTPUT is an MCU, less than 200mA current.

Will this be a problem? I think this should be OK... but not very sure.

PCB are already manufactured, we do not hope to do hardware revision. Thanks!

over 2 years ago

+1 Kalin Burnside over 2 years ago

TI__Genius 13260 points

Hello Div,

There are multiple problems with having the input and output reversed.

1. QOD will provide a path to ground from the input when the device is disabled.

2. You will not be able to disable the device, it will at least be D3V3_IN - Vf.

3. The internal body diode is not stress tested and it's not guaranteed to hold 3A continuous current.

With 200mA it shouldn't be an issue with damaging the internal body diode though.

Regards,

Kalin Burnside

+1 BX27 over 2 years ago in reply to Kalin Burnside

Genius 3870 points

hi Kalin,

1 and 3 should be acceptable.

But for 2, do you have information of Vf of the internal body diode? Thanks !

+1 Kalin Burnside over 2 years ago in reply to BX27

TI__Genius 13260 points

Hello Div,

We do not have any specific data on the Vf range as the device is not meant to be used bidirectionally. You could run tests on the EVM to get an idea, but over a significant amount of devices there would be some variance.

Regards,

Kalin Burnside

Power management

Power management forum

TPS22810: Misuse the input and output