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TPS22910A: ON and VIN pins voltage sequence

Part Number: TPS22910A
Other Parts Discussed in Thread: TPS22990

Dear Support Team,

This question is related to: https://e2e.ti.com/support/power-management/f/196/t/354708?tisearch=e2e-sitesearch&keymatch=tps22910a

TPS22910A ON input is active low.

1) In order to prevent output voltage during device start-up, I apply 5V to ON pin and only after that 5V to VIN pin. Such sequence will not be harmful to the device? Do I have any unexpected input current at ON pin?

2) In another scenario, I will pull-up ON pin through 10kOhm to 5V and VIN also will be 0V. And in rare cases 5V will be applied to VIN and ON signal will be toggled. Is such application permissible?

3) Is it possible to connect in parallel several TPS22910A  in order to increase the continuos switch current rating?

Thank you

Andrei

  • Hi Andrei, 

    Thanks for reaching out on E2E!

    Please find the answers to your questions below:

    1) In order to prevent output voltage during device start-up, I apply 5V to ON pin and only after that 5V to VIN pin. Such sequence will not be harmful to the device? Do I have any unexpected input current at ON pin?

    [AH]: No, this sequence will not harm the device.  

    2) In another scenario, I will pull-up ON pin through 10kOhm to 5V and VIN also will be 0V. And in rare cases 5V will be applied to VIN and ON signal will be toggled. Is such application permissible?

    [AH]: If VIN and ON pin are connected, toggling the 5V will cause the output to fall and then ramp up again. What is the frequency / speed of the toggling event?

    3) Is it possible to connect in parallel several TPS22910A  in order to increase the continuos switch current rating?

    [AH]: Yes, you can parallel several TPS22910A together to increase the current rating. We've used similar configurations on other load switches, such as the TPS22990: https://e2e.ti.com/support/power-management/f/196/t/754360

    Thanks,

    Arthur Huang