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Apple
This is the PP3V42_G3H regulator IC for certain model Macbooks. It turns either 18v, 16v, 12v, or 8v into 3.42v. Part Number: U6990 Printed Number: PM6640 Compatible Board: 820-2915 820-2914 820-3115 820-2936 Pin Numbers: QFN-14 Pin