Texas Instruments TPS51116 datasheet in PDF form, 2.92 MB, for a DDR memory power controller that combines a synchronous buck regulator for the memory supply with a VTT termination regulator and reference output. On laptop boards it typically generates the RAM voltage rails. Use the pin descriptions to check enable inputs, power-good, feedback and the VTT and VTTREF outputs when memory power is missing. Verify the package type on the board, because pin numbering depends on the package listed in the ordering table.
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