The LTC1403AIMSE#PBF is an ultra-low power, monolithic synchronous step-down switching regulator with integrated MOSFETs from Analog Devices. It offers high efficiency and fast transient response along with excellent line, load and temperature regulation. The device features an adjustable switching frequency that allows efficient operation at all load levels, and integrated soft-start circuitry that limits the inrush current during startup. It has a wide input voltage range from 4.5V to 36V and can deliver up to 3A of continuous output current with full-range voltage tracking. Other features include current-mode, pulse-by-pulse current limiting, thermal shutdown, and high-accuracy, fast-response voltage feedback.The LTC1403AIMSE#PBF is available in a 20-lead, 4x4mm Pb-free and RoHS-compliant package making it ideal for high-density applications.