This part is a kind of semiconductor called APW7080.

Function of this product has Asynchronous Step-Down Converter.

Manufacturers : ANPEC

Image and pinout :

Some of the text within the PDF file :

APW7080 4A, 26V, 380kHz, Asynchronous Step-Down Converter Features • • • • • • • • • • • • • • • Wide Input Voltage from 4.5V to 26V Output Current up to 4A Adjustable Output Voltage from 0.8V to 90%VIN - 0.8V Reference Voltage - ±2.5% System Accuracy 80mΩ Integrated P-Channel Power MOSFET High Efficiency up to 91% - Pulse-Skipping Mode (PSM) / PWM Mode Operation Current-Mode Operation - Stable with Ceramic Output Capacitors - Fast Transient Response Power-On-Reset Monitoring Fixed 380kHz Switching Frequency in PWM Mode Built-in Digital Soft-Start Output Current-Limit Protection with Frequency Foldback 70% Undervoltage Protection Over-Temperature Protection <5µA Quiescent Current during Shutdown Thermal-Enhanced SOP-8P Package Lead Free and Green Devices [ ... ]

APW7080 PDF Datasheet Download