This part is a kind of semiconductor called ADP3168.

Function of this product has 4-Phase Synchronous Buck Controller.

Manufacturers : Analog Devices

Image and pinout :

Some of the text within the PDF file :

6-Bit, Programmable 2-, 3-, 4-Phase Synchronous Buck Controller ADP3168 FEATURES Selectable 2-, 3-, or 4-phase operation at up to 1 MHz per phase ±10 mV worst-case differential sensing error over temperature Logic-level PWM outputs for interface to external high power drivers Active current balancing between all output phases Built-in Power Good/crowbar blanking supports On-the-fly VID code changes 6-bit digitally programmable 0.8375 V to 1.6 V output Programmable short-circuit protection with programmable latch-off delay FUNCTIONAL BLOCK DIAGRAM VCC 28 RAMPADJ 14 RT 13 ADP3168 UVLO SHUTDOWN AND BIAS 11 OSCILLATOR SET EN 27 EN 19 CMP RESET GND DAC +150mV CMP RESET CSREF CURRENTBALANCING CIRCUIT CMP DAC –250mV CMP RESET 2-, 3-, 4-PHASE DRIVER LOGIC RESET [ ... ]

ADP3168 PDF Datasheet Download