Step-Down DC/DC Converter Includes Integrated Boost and Catch Diodes

Milpitas, CA — Linear Technology Corporation announces the LT3470, a 40V Micropower step-down DC/DC converter with integrated boost and catch diodes in a ThinSOTTM package. It operates from input voltages of 4V to 40V, delivering up to 200mA of output current optimizing it for 2-cell Li-Ion, wall adapter or automotive power sources. Burst Mode operation reduces quiescent current to only 26uA, making it ideal for applications such as always-on automotive systems. With an entire solution footprint of only 50mm2, the LT3470 works well in space constrained applications.

The LT3470 utilizes a hysteretic control scheme in conjunction with BurstMode operation to provide low output ripple, less than 10mVp-p, and low quiescent current, while using a tiny inductor and ceramic capacitor. Integrated boost and catch diodes reduce external component count and solution size. Finally, fast current limiting and hysteric control protects the LT3470 and external components against shorted outputs, even at 40V.

Summary of Features: LT3470
Input Range: 4V to 40V
Low Quiescent Current: 26μA at 12VIN to 3.3VOUT
Integrated Boost and Catch Diodes
Low Output Ripple: <10mVp-p
<1μA in Shutdown Mode
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 (1mm) ThinSOT Package

The LT3470 in a ThinSOT is available from stock. Pricing starts at $2.30 each for 1,000-piece quantities.

Linear Technology Corporation, 1630 McCarthy Boulevard, Milpitas, CA 95035-7417. Tel: 408-432-1900; For literature call 1-800-4-LINEAR (800-454-6327). Web site:

3470 data sheet

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