This part is a kind of semiconductor called AE2576.

Function of this product has SIMPLE SWITCHER 3A Step-Down Voltage Regulator.

Manufacturers : Chip-Rail

Image and pinout :

Some of the text within the PDF file :

AE2576 SIMPLE SWITCHER 3A Step-Down Voltage Regulator Features 3.3V, 5V, 12V, 15V and adjustable output versions Adjustable version output voltage range, 1.23V to 30V ±4% max over line and load conditions Guaranteed 3A output current Input voltage up to 45V Requires only 4 external components 52KHz fixed frequency internal oscillator TTL shutdown capability, low power standby mode High efficiency Thermal shutdown and current limit protection Applications Simple high-efficiency step-down (buck) regulator Efficient pre-regulator for linear regulators Positive to negative converter (BucK-Boost) General Description The AE2576 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving 3A load w [ ... ]

AE2576 PDF Datasheet Download