This part is a kind of semiconductor called NCP3218G.

Function of this product has Mobile CPU Synchronous Buck Controller.

Manufacturers : ON Semiconductor

Image and pinout :

Some of the text within the PDF file :

ADP3212, NCP3218, NCP3218G 7-Bit, Programmable, 3-Phase, Mobile CPU Synchronous Buck Controller The APD3212/NCP3218/NCP3218G is a highly efficient, multi−phase, synchronous buck switching regulator controller. With http://onsemi.com its integrated drivers, the APD3212/NCP3218/NCP3218G is optimized for converting the notebook battery voltage into the core supply voltage required by high performance Intel processors. An internal 7−bit DAC is used to read a VID code directly from the processor and to set the CPU core voltage to a value within the range 1 48 1 48 of 0.3 V to 1.5 V. The APD3212/NCP3218/NCP3218G is QFN48 QFN48 programmable for 1−, 2−, or 3−phase operation. The output signals CASE 485AJ CASE 485BA ensure interleaved 2− or 3−phase operation. The APD32 [ ... ]

NCP3218G PDF Datasheet Download