BUY LM2585S-12 https://www.utsource.net/itm/p/35176.html
SIMPLE SWITCHER 3A Flyback Regulator
Description: The LM2585S-12 is a monolithic integrated circuit in a TO-263 package. It is a step-down switching regulator with a maximum output current of 1.5A. Features: Input voltage range: 4.5V to 40V Output voltage range: 1.23V to 37V Output current: 1.5A Switching frequency: 150kHz Internal compensation Internal soft-start Internal thermal shutdown Low quiescent current Low output ripple High efficiency Applications: Battery-powered systems Automotive applications Portable devices Low-noise power supplies DC-DC converters Step-down regulators (For reference only)