BUY LM2576S-12 https://www.utsource.net/itm/p/11256276.html
IC REG BUCK 12V 3A TO263-5
Description: The LM2576S-12 is a monolithic integrated circuit that provides all the active functions for a step-down (buck) switching regulator, capable of driving a 3A load with excellent line and load regulation. Features: rn Output voltage adjustable from 1.23V to 37V rn Output current of 3A rn Internal frequency compensation rn Internal thermal shutdown rn Internal current limit rn Low quiescent current rn TTL shutdown capability rn Low profile TO-263 package Applications: rn Battery-powered systems rn Automotive systems rn Telecom systems rn Industrial systems rn Computer systems rn Portable systems (For reference only)