This part is a kind of semiconductor called APW7070.

Function of this product has Synchronous Step-Down Converter.

Manufacturers : ANPEC

Image and pinout :

Some of the text within the PDF file :

APW7070/A 3A, 20V, 380kHz, Synchronous Step-Down Converter Features • • • • • • • • • • • • • • • • • • • Wide Input Voltage from 4.75V to 20V Output Current up to 3A Adjustable Output Voltage from 0.8V to 90%VIN - 0.8V Reference Voltage - ±2.5% System Accuracy 80mΩ Integrated MOSFETs High Efficiency up to 93% Current-Mode Operation - Stable with Ceramic Output Capacitors - Fast Transient Response Power-On-Reset Monitoring Fixed 380kHz Switching Frequency in PWM Mode Automatic Pulse-Skipping Mode (PSM)/PWM Mode Operation (APW7070A) Forced-PWM Operation (APW7070) Built-in Digital Soft-Start Output Current-Limit Protection with Frequency Foldback 70% Under-Voltage Protection Over-Temperature Protection 118% Over-Voltage Protection <5µA Quiescent Cur [ ... ]

APW7070 PDF Datasheet Download