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Original question:

TPS22811: how to proper enable the controller from a microcontroller

TPS22811: Simple enabling from power button

Aria10
Prodigy 130 points
Part Number: TPS22811

Tool/software:

If I want to just connect it to an output of a power button controller can I connect my load switch this way? Is it going to work?

  • 0
    TI__Mastermind 38645 points

    Hi Aria,

    Can you confirm my understanding of your question/system.

    I am assuming that power button controller is debouncing circuit, controller with external FETs controlling the main power path. You want to use this device instead of external FET and control the enable signal using the power button controller.

    Best Regards,
    Arush

  • 0 in reply to Arush Gupta
    Prodigy 130 points

    Yes in other words..
    The power button controller has an output signal that goes high when the power button is pressed. The output signal is this "Sys_PWR_ON". Basically the external power path control FET is being replaced by this load switch which gates the high current power rail Sys_Switch from downstream until power button is pressed.
    The power button controller I am using is LTC2954b

  • +1 in reply to Aria10
    TI__Mastermind 38645 points

    Hi Aria,

    I don't see any concerns here. You may have to add a pull down at this pin for scenario where LTC2954b is not controlling the pin (when the controller ic is off is one such possible scenario)

    Best Regards,
    Arush

  • 0 in reply to Arush Gupta
    Prodigy 130 points

    Appreciate the review thank you!