TPS62260: Behavior when not supplied but powered on the output

TISL

Expert 4640 points

Part Number: TPS62260

Dear Support,

My customer intend to use our buck with a 3.3V applied on Vout, while it's not powered on the input.

In such a case, when an external voltage is applied on the output, it will duplicate the 3.3V to the input, right?

Are there some limitations or damages that could occur on our buck?

Regards,

over 5 years ago

0 Alfonso Furio over 5 years ago

TI__Expert 3645 points

Hello,

can you tell me more details about your application? Where is connected EN? Use the device in this condition should be carefully checked. Shouldn't be issue if the Vin is higher than 3.3V, EN tied to gnd and not operate in forced pwm.

0 TISL over 5 years ago in reply to Alfonso Furio

TI__Expert 4640 points

Hi Alfonso,

I'll share you the schematic in private.

But in that case, the DC/DC won't be supplied (nothing on Vin).

And Mode pin is set low, so in PFM mode...

Regards,

0 Alfonso Furio over 5 years ago in reply to TISL

TI__Expert 3645 points

Hello,

I am going to close this post since we continue to speak in private.

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TPS62260: Behavior when not supplied but powered on the output