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Linear Technology announces the LTC3548, a dual output, high efficiency, 2.25 MHz, synchronous buck regulator which delivers up to 800 mA of continuous output current from one channel and up to 400 mA from the other. Using a constant frequency and current mode architecture, the LTC3548 operates from an input voltage range of 2.5 to 5.5 V. It can generate two independent output voltages as low as 0.6 V. Its 2.25 MHz switching frequency of allows the use of tiny, low cost ceramic capacitors and inductors less than 1 mm in height. The combination of dual architecture, tiny externals and a low profile (0.75) exposed pad 3 × 3 mm DFN package make the LTC3548 a compact synchronous step-down solution for dual output voltage rails. A leaded MSOP-10E package is also available. The LTC3548 uses internal switches with an RDS(ON) of 0.35Ω to deliver efficiencies as high as 95%. It also utilizes low dropout 100% duty cycle operation to allow output voltages up to VIN. No load quiescent current is only 40 uA (both channels), and < 1 uA in shutdown ensuring optimum battery life.
Linear Technology Corporation

Linear Technology Corporation
http://www.linear.com