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Original question:

TPS25221: specification differences in TPS2553 and TPS25221

TPS25221: Is it safe to apply 400mV to EN pin while IN pin is at 0v

Rick Tan
Prodigy 20 points
Part Number: TPS25221

Is there any long term reliability or functional concerns if EN pin is powered up while IN pin is at 0v?

  • 0
    TI__Mastermind 18031 points
    Hi Rick,
    That's ok.

    And can you kindly tell me your detail concern?

    If you have any concern, contact me any time.
    If this is your answer, please click 'Issue is solved' button.
    Thanks.
  • 0 in reply to Ziv Zhang
    Prodigy 20 points

    In our circuit, we have an OR gate and a microcontroller connected to the EN pin of TPS25221.

    The OR gate and the TPS25221 IN pin are powered from a +3.3v rail that can be on or off.  However, the microcontroller is on a power rail that is always on.  This pin on the microcontroller is presenting 400mV when the +3.3v rail is off.  We would ike to determine if it is a reliability concern that the EN pin is at 400mV while IN pin is at 0v.

  • 0 in reply to Rick Tan
    TI__Mastermind 18031 points
    Hi Rick,

    Sorry for the late reply.

    That's no problem of your operation.

    I will close the issue first. If you have other concern, contact me any time.
    Thanks.

    Ziv