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TPS22919: Smart pull down

Mason Noh
Expert 2490 points
Part Number: TPS22919

Hi TI experts,

My understanding, TPS22919 has internal pull down resistor on ON pin.

But pin description say 'Do not leave floating'

What is correct?

  • 0
    TI__Genius 10855 points

    Hi Mason,

    Thanks for reaching out on E2E!

    The TPS22919 has an internal pull-down resistor once the voltage on the ON pin is below VIL. Once the voltage is below VIL, the resistor will help pull the voltage on the pin to 0V. When the voltage is above VIL, the resistor is not enabled. Therefore, if you can guarentee that the voltage on the ON pin goes below VIL, the voltage should go to 0V.

    Thanks,

    Arthur Huang

    To find the latest information on Power Switches, visit www.ti.com/powerswitch

    Please click "This resolved my issue" button if this post answers your question.

  • 0 in reply to Alpha H
    Expert 2490 points
    Hi Arthur,
    You mean I can leave floating ON pin?
  • 0 in reply to Mason Noh
    TI__Genius 10855 points
    Hi Mason,

    If your EN/ON circuitry turns on / off the ON pin such that the voltage will drop past VIL, then yes you can leave it floating. Once the voltage on the ON pin is lower than VIL, the pull-down resistor will be enabled.

    Thanks,
    Arthur Huang