What are typical ripple voltages on a laptop motherboard?

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  • Antonynl
    Senior Member
    • Apr 2021
    • 74
    • Nederland
    #1

    What are typical ripple voltages on a laptop motherboard?

    I have here a HP pavilion hp 15-cs2975nd with a 1.095v power supply that is driven by a FDMF3035. I do see about 80mV of ripple on my scope. I searched through the datasheet to find possible values of the ripple but I don't understand the datasheet well enough.

    So I have two questions:
    1) what is the typical ripple voltages of gpu/cpu on a laptop or pc mobo?
    2) what would be the max ripple of a FDMF3035 that drives an output of 1.095V?

    Would be nice to have a rule of thumb of say a percentage of the supply voltage to be an acceptable ripple voltage.

    Thanks!
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