This part is a kind of semiconductor called ADP3188.

Function of this product has 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 ADP3188 FEATURES Selectable 2-, 3- or 4-phase operation at up to 1 MHz per phase ±9.5 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 ADP3188 EN 11 UVLO SHUTDOWN AND BIAS OSCILLATOR SET RESET EN 27 PWM1 GND 19 CMP DAC+150mV CSREF CURRENT BALANCING CIRCUIT CMP CMP RESET 2-/3-/4-PHASE DRIVER LOGIC RESET 26 PWM2 25 PWM3 DAC-250mV CMP PWRGD 10 DELAY RE [ ... ]

ADP3188 PDF Datasheet Download