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Old 11-19-2021, 06:59 AM   #1
dicky96
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Default 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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Old 11-19-2021, 07:53 AM   #2
diif
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Default Re: VRM controller OT=FF identify?

Is it a RT8811A ?
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File Type: pdf RT8811AGQW.pdf (372.4 KB, 6 views)
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Old 11-20-2021, 12:08 PM   #3
dicky96
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Default 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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