DC/DC Converter includes integrated boost and catch diodes.

Press Release Summary:




Model LT3470 40 V micropower step-down dc/dc converter operates from input voltages of 4-40 V, delivering up to 200 mA of output current, optimizing it for 2-cell Li-Ion, wall adapter or automotive power sources. Burst Mode® operation reduces quiescent current to 26 µA. Hysteretic control scheme provides output ripple of less than 10 mVp-p. Available in low profile ThinSot package, LT3470 works well in space constrained applications.



Original Press Release:



40V, 200mA Micropower Step-Down DC/DC Converter Includes Integrated Boost and Catch Diodes



Milpitas, CA - February 1, 2005 - Linear Technology Corporation announces the LT3470, a 40V Micropower step-down DC/DC converter with integrated boost and catch diodes in a ThinSOT(TM) 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.

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

Summary of Features: LT3470

Input Range: 4V to 40V

Low Quiescent Current: 26uA at 12VIN to 3.3VOUT

Integrated Boost and Catch Diodes

Low Output Ripple: <10mVp-p

<1uA 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

Company Background

Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems.

John Hamburger
Tel: (408) 432-1900 ext. 2419
jhamburger@linear.com

Doug Dickinson
Tel: (408) 432 1900 ext. 2233
ddickinson@linear.com

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