This part is a kind of semiconductor called APW7145.

Function of this product has Synchronous-Rectified Buck Converter.

Manufacturers : Anpec Electronics Coropration

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Some of the text within the PDF file :

APW7145 3A, 12V, Synchronous-Rectified Buck Converter Features • • • • • • Wide Input Voltage from 4.3V to 14V Output Current up to 3A Adjustable Output Voltage from 0.8V to VIN - ±2% System Accuracy 55mΩ Integrated Power MOSFETs High Efficiency up to 95% - Automatic Skip/PWM Mode Operation Current-Mode Operation - Easy Feedback Compensation - Stable with Low ESR Output Capacitors - Fast Load/Line Transient Response General Description The APW7145 is a 3A synchronous-rectified Buck converter with integrated 55m Ω power MOSFETs. The APW7145, designed with a current-mode control scheme, can convert wide input voltage of 4.3V to 14V to the output voltage adjustable from 0.8V to VIN to provide excellent output voltage regulation. For high efficiency over all load current ran [ ... ]

APW7145 PDF Datasheet Download