The SD4931 Switching Controller with SOP-8 RoHS package is manufactured by Silan. It is a CMOS-driven single-function switching controller designed for a wide range of applications including step-down, step-up, and flyback converters. It is optimized for high-level, high-efficiency, and easy-to-use solutions. The device includes a 4-bit DAC controlled voltage reference, a soft start circuit, a loop compensation ramp generator, and a pulse-by-pulse current limit circuit. It also features a high accuracy PWM generator operating up to 1 MHz with quadrature signals, enabling double-ended clocking and allowing fast loop response. The low quiescent current and high power efficiency of the device makes it a suitable choice for applications requiring low power consumption. It is RoHS complaint and compliant to UL94V-0 standards.