This part is a kind of semiconductor called XL4015.

Function of this product has 5A 180KHz 36V Buck DC to DC Converter.

Manufacturers : Xlsemi

Image and pinout :

Some of the text within the PDF file :

Datasheet 5A 180KHz 36V Buck DC to DC Converter Features n n n n n n n n n n n n n Wide 8V to 36V Input Voltage Range Output Adjustable from 1.25V to 32V Maximum Duty Cycle 100% Minimum Drop Out 0.3V Fixed 180KHz Switching Frequency 5A Constant Output Current Capability Internal Optimize Power MOSFET High efficiency up to 96% Excellent line and load regulation Built in thermal shutdown function Built in current limit function Built in output short protection function Available in TO263-5L package XL4015 General Description The XL4015 is a 180 KHz fixed frequency PWM buck (step-down) DC/DC converter, capable of driving a 5A load with high efficiency, low ripple and excellent line and load regulation. Requiring a minimum number of external components, the regulator is simple to use and incl [ ... ]

XL4015 PDF Datasheet Download