BUY KA3842 https://www.utsource.net/itm/p/11204037.html

The KA3842 is a dual-channel, high-performance, high-efficiency, low-power, bipolar linear integrated circuit. It is designed for use in switch mode power supplies (SMPS) and other power control applications. Features: High efficiency: up to 95% Low power consumption: 0.6W Low quiescent current: 0.6mA Low voltage operation: 4.5V to 40V High ripple rejection: up to 70dB Low output noise: 0.1mV Low output voltage ripple: 0.1mV High frequency operation: up to 100kHz Applications: Switch mode power supplies Motor control Battery chargers DC-DC converters Voltage regulators Power amplifiers (For reference only)