VRM controller OT=FF identify?

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  • dicky96
    Sun Seeker
    • Mar 2017
    • 1825
    • Spain

    #1

    VRM controller OT=FF identify?

    Hi guys
    This IC is on a Zotax GTX780 3Gb

    Normally I would find the datsheet by searching MPS OT Buck (a trick I learned here ) but that says it is a MPS8860 and it does not match the pinout of my chip which is a QFN with 6 leads on each side

    It drives two 4901N dual MOSFET gates from pins 2, 17, 20 and 23 and these drive what looks like a 2 phase VRM which is probably VRAM. This rail does not power up.

    Hopefully that is enough info to identify

    Thanks
    Rich
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  • diif
    Badcaps Legend
    • Feb 2014
    • 6978
    • England

    #2
    Re: VRM controller OT=FF identify?

    Is it a RT8811A ?
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    • dicky96
      Sun Seeker
      • Mar 2017
      • 1825
      • Spain

      #3
      Re: VRM controller OT=FF identify?

      Thanks diif
      I found a schematic for a Gigabyte GTX780 that has this component fitted RT8811AGQW/WQFN-24L

      and appears to closely match my Zotac board so it looks like you correctly identified that one. Thanks
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