This part is a kind of semiconductor called AIC1596.

Function of this product has 3A STEP-DOWN PWM REGULATOR.

Manufacturers : Analog Intergrations Corporation

Image and pinout :

Some of the text within the PDF file :

ADVANCED INFORMATION AIC1596 3A STEP-DOWN PWM REGULATOR SPEC NO: DS-1596-P1 03/23/00 ! FEATURES " " " ! DESCRIPTION The AIC1596 series are step-down monolithic PWM regulators delivering 3A at fixed voltages of 2.5V , 3.3V, 5.0V , 12V and using a external divider to adjust output voltage from 1.25V to 30V with excellent line and load regulation. Switching frequency up to 150KHz/300KHz are achievable thus allowing smaller sized filter components. Internal current limit and thermal shutdown circuits provide protection from overloads. It also provides output overvoltage and short protection under fault conditions. The internal precious reference combined with " " " " " " " " Operating Input Voltage From 4.5V to 36V 2.5V, 3.3V, 5V , 12V and Adjustable Output Version Ad [ ... ]

AIC1596 PDF Datasheet Download