The Linear Technology LTC3626 is a high efficiency, 3 MHz, synchronous buck regulator that offers both input and output current limiting and monitoring. It incorporates a unique constant frequency / controlled on-time, current-mode architecture that delivers up to 2.5 A of continuous output current at output voltages as low as 0.6 V from a 3 mm x 4 mm QFN package. Its current-mode operation offers excellent line and load transient response, even with high step-down ratios.

The LTC3626 operates from an input voltage range of 3.6 V to 20 V, making it suitable for a wide range of applications including dual/multiple-cell Li-Ion battery stacks and 5 V to 18 V intermediate bus systems. Its average input current and output current limiting are pin-programmable, making it well-suited for applications such as USB power. The LTC3626’s switching frequency is user programmable and synchronizable from 500 kHz to 3 MHz, enabling the use of tiny, low cost capacitors and inductors.