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Finding appropriate 3.3 V load switch

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    Finding appropriate 3.3 V load switch

    Hello,

    I need to find an alternative to load switch TPS 22924C. This is chip is ultra Small CSP-6 package quick discharge when switch is turned off. The dimensions are 0.9 mm x 1.4 mm, 0.5-mm. With RDS ON ultra small resistance (typical 20 mOhms).
    The datasheet is here: https://pdf1.alldatasheet.com/datash...2924CYZPT.html

    When trying to solder this chip on the board, I was not careful and destroyed the leg (pin) on the board, so soldering is not possible anymore (i.e. there is no contact).
    EN voltage is 3.3V and voltage that needs to be transferred is also 3.3V
    Now I need to find macroscopic alternative so I can solder legs of this alternative chip to other components on the board.

    I hope you'll be able to suggest me something useful.
    Thank you.
    Last edited by Askic; 02-19-2021, 12:56 AM.

    #2
    Re: Finding appropriate 3.3 V load switch

    you should have used hot air!

    TPS is a texas instruments prefix isnt it? those should be available

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      #3
      Re: Finding appropriate 3.3 V load switch

      Originally posted by stj View Post
      you should have used hot air!

      TPS is a texas instruments prefix isnt it? those should be available
      I did use hot air to remove the component, but when I tried to make contact pins better with soldering iron, one pin (nr 5) just vanished from the board. This TI chip is BGA, I need bigger with legs, so I can solder its legs to probe points in the board.

      I need this new chip to have Enable pin on 3.3V, ground and Vin and Vout outputs. Its On resistance should be about 20 mOhms and max current 2A. All I could find are ultra small chips.

      I have found this, but not quite inside the specification. This could work but I'll try to find something more Closer. https://cdn.badcaps-static.com/pdfs/...ed94b2d8fd.pdf
      I basically need sot23 package
      Last edited by Askic; 02-19-2021, 10:33 AM.

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        #4
        Re: Finding appropriate 3.3 V load switch

        Guys, I have found a solution to my problem.
        The solution is to use evaluation board:
        https://www.ti.com/tool/TPS22925EVM
        and to cut out part with load switch already soldered but with easily accessible contacts.
        Then solder jumper wires between EVM and actual probe points and ground on the actual mother board.
        A little drop of hot glue to keep these PCBs together and the job is done.

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          #5
          Re: Finding appropriate 3.3 V load switch

          good to know and understand

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