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TPS2561A: Backdrive Protection from OUT to IN pins on the TPS2561

Luc Bouchard
Prodigy 90 points
Part Number: TPS2561A

Hi,

I would like to know if the TPS2561ADRC has some backdrive protection.

If the OUT pins have a voltage apply on them but the IN is floating (0V) and EN pins is low @ 0V, will there be some backdrive current flowing from the OUT pins to the IN pins that could create a voltage on the IN pins?

I realized it is not a case that is quite possible for an USB application.  I am using this device of a different application.

Thank You !

  • 0
    TI__Mastermind 18031 points

    Hi Luc,

    The part is with the function of reverse protection as disabled.

    With your description, the voltage from output will not flow into input side.

    For TI's policy, I will first click resolved button.

    If you have any other concern, contact me any time.

    If you think resolved, please help click 'Issue is solved button'.

    Thanks.

  • 0
    Prodigy 90 points

    Thanks for the reply Ziv.

    But your answer confuses me and seems contradictive.

    You first say the reverse protection is disabled.

    But you then say the output voltage will not flow to the input.  So it would be enabled ?!?

    Can you please clarify.  

    And is there anything in the datasheet that can also help understand that protection.

    Thanks,

    Luc

  • +1 in reply to Luc Bouchard
    TI__Mastermind 18031 points

    Hi Luc,

    Sorry for the confusing.

    The part is with the function of reverse protection as the IC is disabled.

    For power switch, the internal Mos is back to back. So if you disable the part, due to the parasitic diode of both back to back Mos, the voltage are sure will not be able to flow to input side.

    For TI's policy, I will first click resolved button.

    If you have any other concern, contact me any time.

    If you think resolved, please help click 'Issue is solved button'.

    Thanks.