This part is a kind of semiconductor called AX3162.
Function of this product has PWM Control 2A Step-Down Converter.
Manufacturers : AXElite
Image and pinout :
Some of the text within the PDF file :
AX3162 PWM Control 2A Step-Down Converter GENERAL DESCRIPTION AX3162/A consists of step-down switching regulator with PWM control. These devise include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. AX3162/A provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to the duty ratio linearly form 0 up to 100%. This converter is build out soft start function that prevents overshoot and inrush current at startup. An over current protect function and short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency will be reduced. An external compensation is easily to system stable; the low ESR output capacitor can be used. With the addition of an inte [ ... ]