This part is a kind of semiconductor called ADP3186.

Function of this product has 5-Bit Programmable 2-/3-/4-Phase Synchronous Buck Controller.

Manufacturers : Analog Devices

Image and pinout :

Some of the text within the PDF file :

5-Bit Programmable 2-/3-/4-Phase Synchronous Buck Controller ADP3186 FEATURES Selectable 2-, 3-, or 4-phase operation at up to 1 MHz per phase ±1% 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 5-bit digitally programmable 0.8 V to 1.55 V output Programmable short-circuit protection with programmable latch-off delay FUNCTIONAL BLOCK DIAGRAM VCC 28 RAMPADJ 14 RT 13 ADP3186 UVLO SHUTDOWN AND BIAS EN 11 OSCILLATOR SET EN 27 PWM1 GND 19 CMP RESET CROWBAR 6 CSREF 2.1V CMP CURRENT BALANCING CIRCUIT CMP RESET 2-/3-/4-PHASE DRIVER LOGIC RESET 26 PWM2 25 PWM3 DAC [ ... ]

ADP3186 PDF Datasheet Download