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BUY UC3909DW https://www.utsource.net/itm/p/221158.html
Battery Management
Package: SOP20 Description: UC3909DW is a high-performance, low-cost, high-efficiency, current-mode PWM controller. Features: Wide input voltage range: 4.5V to 40V Internal soft-start Internal oscillator Low start-up current Output current limit Over-temperature protection Internal compensation Output voltage adjustable Low shutdown current Low quiescent current Low EMI Applications: Switching power supplies AC/DC converters DC/DC converters Battery chargers Motor control (For reference only)