Synchronous step-up converter 96% efficient

30 June 2004 Power Electronics / Power Management

Linear Technology's LTC3421, a 3 MHz, current mode, synchronous boost DC/DC converter with true output disconnect and inrush current limiting, has internal switches that provide a 3 A current limit (min) and delivers output voltages as high as 5,25 V from an input voltage range of 0,5 V to 4,5 V. This makes the device suitable for Li-Ion and single/multicell alkaline/NiMH applications.

The LTC3421 delivers up to 1,5 A of continuous output current from two alkaline cells. Synchronous rectification enables efficiencies of 96% while burst mode operation lowers quiescent current to only 12 µA. The combination of a 4 x 4 mm QFN package and a constant switching frequency of 3 MHz minimises both inductor and capacitor sizes, providing a tiny solution footprint ideal for handheld applications. The device uses internal switches with an RDS(ON) of only 0,10 Ω (N-Channel) and 0,14 Ω (P-Channel) to deliver efficiencies as high as 96%.

An open-drain uncommitted low-battery comparator is included and maintains operation in applications with a secondary cell powering the output voltage during shutdown. Additional features include adjustable current limit, anti-ring control, programmable soft-start, external synchronisation capability, a reference output, and thermal protection.

For more information contact Memec SA, 011 897 8600.

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