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)