Data Sheet
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Overview

Features and Benefits

  • 1.2MHz Switching Frequency
  • Low VCESAT Switches: 330mV at 1.3A
  • High Output Voltage: Up to 40V
  • Wide Input Range: 2.4V to 16V
  • Inverting Capability
  • 5V at 630mA from 3.3V Input
  • 12V at 320mA from 5V Input
  • –12V at 200mA from 5V Input
  • Uses Tiny Surface Mount Components
  • Low Shutdown Current: <1µA
  • Low Profile (0.75mm) 10-Lead 3mm × 3mm DFN Package

Product Details

The LT3471 dual switching regulator combines two 42V, 1.3A switches with error amplifiers that can sense to ground providing boost and inverting capability. The low VCESAT bipolar switches enable the device to deliver high current outputs in a small footprint. The LT3471 switches at 1.2MHz, allowing the use of tiny, low cost and low profile inductors and capacitors. High inrush current at start-up is eliminated using the programmable soft-start function, where an external RC sets the current ramp rate. A constant frequency current mode PWM architecture results in low, predictable output noise that is easy to filter.

The LT3471 switches are rated at 42V, making the device ideal for boost converters up to ±40V as well as SEPIC and flyback designs. Each channel can generate 5V at up to 630mA from a 3.3V supply, or 5V at 510mA from four alkaline cells in a SEPIC design. The device can be configured as two boosts, a boost and inverter or two inverters.

The LT3471 is available in a low profile (0.75mm) 10-lead 3mm × 3mm DFN package.

Applications

  • Organic LED Power Supply
  • Digital Cameras
  • White LED Power Supply
  • Cellular Phones
  • Medical Diagnostic Equipment
  • Local ±5V or ±12V Supply
  • TFT-LCD Bias Supply
  • xDSL Power Supply

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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

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Documentation & Resources

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    Tools & Simulations

    LTspice

    LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

    To launch ready-to-run LTspice demonstration circuits for this part:

    Step 1: Download and install LTspice on your computer.

    Step 2: Click on the link in the section below to download a demonstration circuit.

    Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

    LTspice

    LTspice Simulations

    LT3471 Demo Circuit - Dual 1.3A, 1.2MHz Boost/Inverter Converter (3.3V to 7V @ 350mA and -7V @ 250mA)

    Models for the following parts are available in LTspice:

    LT3471

    Reference Designs (1)

    Product Recommendations

    LT3471 Companion Parts

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    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

    LT3471 Material Declaration
    Quality And Reliability
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    Support & Discussions

    LT3471 Discussions

    RE: Low noise power supply with LT1021
    RE: Problem suply with adp1613 5V to +-15V to ADC3023
    RE: LT3471 to power a dual power supply
    All LT3471 Discussions
    LT3471 Contact ADI Technical Support »
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    LT3471 Contact ADI Technical Support » LT3471 Ask your question »

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