BUY MP3394 https://www.utsource.net/itm/p/1908103.html
Step-up, 4-String Max 200mA/String White LED Driver
MP3394 is a high-efficiency, step-down DC/DC converter with integrated high-side and low-side MOSFETs. It is designed to deliver up to 3A of continuous output current from a 4.5V to 18V input. The device operates at a fixed frequency of 1.2MHz, allowing the use of small external components. It also features an adjustable output voltage from 0.6V to 5V. Features: Input voltage range: 4.5V to 18V Output voltage range: 0.6V to 5V Output current: up to 3A Fixed frequency: 1.2MHz Integrated high-side and low-side MOSFETs Internal soft-start Thermal shutdown Over-current protection Short-circuit protection Applications: Portable electronics Battery-powered systems Automotive applications Industrial systems (For reference only)