Looking for a DC-DC step down converter module to replace a 0.75v_ALW output and enable pin

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  • questore
    Badcaps Veteran
    • Dec 2015
    • 576
    • csongrád

    #1

    Looking for a DC-DC step down converter module to replace a 0.75v_ALW output and enable pin

    Hello Everyone,
    I need your help, maybe you have know where to buy a replacement.
    I have a NM-D562 laptop motherboard that has a burned 0.75_ALW converter. (the layers and the pins also burned so i dont want to restore it but i need a replacement)
    I have checked with lab power supply output (0.77V) laptop works, so i need a DC-DC module that can do its job.
    According to schematic datasheet what i need on 0.75V_ALW:

    Vout=0.75V±37.5mV
    Vset=0.752V±1.46%
    Vref=0.6V
    TDC=4A
    OCP=9.5A TYP=10.5A MAX
    OVP=(1.15~1.25)*Vout
    UVP=(0.6~0.7)*Vout​

    I'm nut sure if It needs an Enable pin because its an ALW line so if everything is ok then no problem.

  • Answer selected by questore at 11-11-2025, 03:30 PM.
    questore
    Badcaps Veteran
    • Dec 2015
    • 576
    • csongrád

    Measuing with Lab PSU turned out that only max 700 milliamps is needed at full stress on this line.
    So I can safely order a mini modul that has an enable pin and provide up to 3 Amps output.

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    • questore
      Badcaps Veteran
      • Dec 2015
      • 576
      • csongrád

      #2
      Measuing with Lab PSU turned out that only max 700 milliamps is needed at full stress on this line.
      So I can safely order a mini modul that has an enable pin and provide up to 3 Amps output.

      Comment

      • stj
        Great Sage 齊天大聖
        • Dec 2009
        • 31298
        • Albion

        #3
        do the ajustable modules go down under a volt?
        in a stable way i mean.

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        • questore
          Badcaps Veteran
          • Dec 2015
          • 576
          • csongrád

          #4
          Originally posted by stj
          do the ajustable modules go down under a volt?
          in a stable way i mean.
          There is a lot of mini modules that is capable of going down until 0.8v but only a few that is going lower with an enable pin. And i want to go with 0.77v to be safe.

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          • questore
            Badcaps Veteran
            • Dec 2015
            • 576
            • csongrád

            #5
            I have only found 0.8v stepdown dc controller mini boards. Is it within the operational range for all ic?

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            • m1ch43lzm
              Badcaps Legend
              • Mar 2019
              • 1095
              • Peru

              #6
              You'll need an IC that has a reference voltage of 0.6V and at least 2A output, haven't seen any small DC-DC modules on Ali that fit that spec

              What about getting a donor laptop board and cutting that section? Anything with Ryzen 4000/5000 series CPU should do, cut the board to get the 0.75v regulator section and graft it somewhere
              Best if you can get schematics/boardview for the donor
              Some laptops use RT8068AZQW for that section, might be a starting point, or maybe that IC is also used for 1.8V, then you have to modify the feedback resistors to get 0.75V

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