The LTC3548 is a dual, constant frequency, synchronous step down DC/DC converter from Linear Technology. It operates from 2.5V to 5.5V input voltage range and has a constant 2.25MHz switching frequency. Each output voltage is adjustable from 0.6V to 5V. It supports 400mA and 800mA output currents. It features high efficiency, low quiescent current, high switching frequency, low on-resistance, and short-circuit protection. It is suitable for low power applications such as PDAs/Palmtop PCs, digital cameras, cellular phones, portable media players, PC cards, wireless and DSL modems.