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LT3470 - Micropower Buck Regulator with Integrated Boost and Catch Diodes

The LT3470 is a micropower step-down DC/DC converter that integrates a 300mA power switch, catch diode and boost diode into low profile 3mm x 2mm DD and ThinSOT packages. The LT3470 combines Burst Mode and continuous operation to allow the use of tiny inductor and capacitors while providing a low ripple output to loads of up to 200mA.

With its wide input range of 4V to 40V, the LT3470 can regulate a wide variety of power sources, from 2-cell Li-Ion batteries to unregulated wall transformers and leadacid batteries. Quiescent current in regulation is just 26µA in a typical application while a zero current shutdown mode disconnects the load from the input source, simplifying power management in battery-powered systems. Fast current limiting and hysteretic control protects the LT3470 and external components against shorted outputs, even at 40V input.

Features Low Quiescent Current: 26µA at 12VIN to 3.3VOUT Integrated Boost and Catch Diodes Input Range: 4V to 40V Low Output Ripple: <10mV <1µA in Shutdown Mode Output Voltage: 1.25V to 16V 200mA Output Current Hysteretic Mode Control – Low Ripple Burst Mode® Operation at Light Loads – Continuous Operation at Higher Loads Solution Size as Small as 50mm2 Low Profile (0.75mm) 3mm x 2mm Thermally Enhanced 8-Lead DD and 1mm ThinSOT Packages Typical Application

Applications Automotive Battery Regulation Power for Portable Products Distributed Supply Regulation Industrial Supplies Wall Transformer Regulation Packaging

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