This part is a kind of semiconductor called XL4016.
Function of this product has 8A 180KHz 40V Buck DC to DC Converter.
Manufacturers : Xlsemi
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Some of the text within the PDF file :
Datasheet 8A 180KHz 40V Buck DC to DC Converter Features n n n n n n n n n n n n n n Wide 8V to 40V Input Voltage Range Output Adjustable from 1.25V to 36V Maximum Duty Cycle 100% Minimum Drop Out 0.3V Fixed 180KHz Switching Frequency 8A 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 Built in input over voltage protection Available in TO220-5L package XL4016 General Description The XL4016 is a 180 KHz fixed frequency PWM buck (step-down) DC/DC converter, capable of driving a 8A load with high efficiency, low ripple and excellent line and load regulation. Requiring a minimum number of external components [ ... ]