This part is a kind of semiconductor called EN5337QI.

Function of this product has 3A PowerSoC Voltage Mode Synchronous Buck PWM DC-DC Converter.

Manufacturers : Altera

Image and pinout :

Some of the text within the PDF file :

Enpirion® Power Datasheet EN5337QI 3A PowerSoC Voltage Mode Synchronous Buck PWM DC-DC Converter with Integrated Inductor FDescription The EN5337QI is a Power Supply on a Chip (PowerSoC) DC-DC converter. It integrates MOSFET switches, all small-signal circuits, compensation, and the inductor in an advanced 4mm x 7mm QFN package. The EN5337QI is specifically designed to meet the precise voltage and fast transient requirements of present and future highperformance, low-power processor, DSP, FPGA, memory boards, and system level applications in distributed power architectures. Advanced circuit techniques, ultra high switching frequency, and very advanced, high-density, integrated circuit and proprietary inductor technology deliver highquality, ultra compact, non-isolated DC-DC conversion. T [ ... ]

EN5337QI PDF Datasheet Download