The Linear Technology LTC3623 is a feature-rich, high efficiency, ±5A synchronous buck regulator that incorporates a constant frequency controlled on-time, current mode architecture, with programmable output current and output voltage in a 3mm x 5mm QFN package. The device operates from an input voltage range of 4V to 15V and provides an adjustable rail-to-rail output voltage range programmable with a single resistor from 0V to 0.5V below VIN, while delivering up to 5A of continuous output current, both sinking and sourcing. It is ideal for a wide range of DDR memory, dual-cell Li-Ion powered systems, fixed 5V and 12V intermediate bus and industrial applications.