The LTC3891IUDCTR#PBF is a synchronous step-down switching regulator controller. It is fabricated using an advanced CMOS process. This device features a 5-bit DAC for precise programming of the output voltage. It is designed for high-performance point-of-load voltage regulation applications. The LTC3891IUDCTR#PBF operates from an input voltage range of 4.5V to 28V and provides a 0.8V to 5.5V adjustable output voltage with ±1.5% tolerance. It offers adjustable switching frequency up to 2 MHz, integrated 2-phase synchronous current-mode operation, an ultra-fast current-limit loop, and external compensation. The current-limit accuracy is ±20%, and the device is fully protected with over-temperature, overload, and overvoltage protection. It also offers an internal soft-start with an adjustable soft-start ramp rate. The LTC3891IUDCTR#PBF is available in industry-standard, thermally-enhanced TSSOP-24 package and is suitable for industrial, communications and computing applications.