BUY UCC2809D-1 https://www.utsource.net/itm/p/570676.html
Low drop fixed and adjustable positive voltage regulators
Description: The UCC2809D-1 is a high performance, low cost, current mode, pulse width modulation (PWM) controller. It is designed to provide all the control and protection functions necessary for off-line and DC-to-DC converters with minimal external components. Features: High performance current mode PWM control Low start-up current (typically 0.5mA) Internal soft-start Internal leading edge blanking Internal frequency compensation Internal over-voltage protection Internal under-voltage lockout Internal over-current protection Internal thermal shutdown Internal current limit Low external component count SOP-8 package Applications: Off-line and DC-to-DC converters Switching power supplies Uninterruptible power supplies Battery chargers Motor control (For reference only)