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Data Sheet
PDF
JP
User Guides
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Overview

Features and Benefits

  • Wide Input Voltage Range: 2.5V to 24V
  • 3A, 42V Internal Switch
  • High Efficiency Power Conversion: Up to 89%
  • Soft-Start
  • Frequency Set by External Resistor: 200kHz to 3.5MHz
  • Protection Against Input Short Circuits and Hot Plugging
  • Low VCESAT Switch: 0.3V at 2.5A (Typical)
  • Capable of Positive and Negative Outputs
  • Available in Thermally Enhanced 14-Lead (4mm × 3mm) DFN and 16-Lead TSSOP Packages

Product Details

The LT3479 is a current mode, fixed frequency step-up DC/DC converter with an internal 3A, 42V switch. Efficiencies of up to 89% can be achieved in typical applications. It features a programmable soft-start function to limit inductor current during start-up and inrush current protection to protect the LT3479 during shorts and line transients. Both inputs of the error amplifier are available to the user allowing positive and negative output voltages. Through an external resistor, the user can program the switching frequency from 200kHz to 3.5MHz. The low profile (0.75mm) 14-pin, 4mm × 3mm DFN package provides excellent thermal performance in a small footprint. The LT3479 is also available in a thermally enhanced 16-pin TSSOP package.

Applications

  • High Power LED Driver
  • DSL Modems
  • Distributed Power

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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.

Evaluation Kits (2)

Documentation & Resources

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  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (2)
  • Design Notes (1)
  • Technical Articles (1)
    • Document Type

    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

    LT3479 Demo Circuit - 3A, Full Featured Step-up Converter (5V to 12V at 0.8A)

    Models for the following parts are available in LTspice:

    LT3479

    Product Recommendations

    LT3479 Companion Parts

    Recommended Related Parts

    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.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    LT3479EDE#PBF Material Declaration Reliability Data 14-Lead DFN (4mm x 3mm w/ EP)
    LT3479EDE#TRPBF Material Declaration Reliability Data 14-Lead DFN (4mm x 3mm w/ EP)
    LT3479EFE#PBF Material Declaration Reliability Data 16-Lead TSSOP w/ EP
    LT3479EFE#TRPBF Material Declaration Reliability Data 16-Lead TSSOP w/ EP
    Wafer Fabrication Data R365 Reliability Data

    PCN-PDN Information

    Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.

    Select Model for PCN Information
    • LT3479EDE#PBF Production
    • LT3479EDE#TRPBF Production
    • LT3479EFE#PBF Production
    • LT3479EFE#TRPBF Production

    Support & Discussions

    LT3479 Discussions

    RE: AN149 from figure 10 to equation 5?
    All LT3479 Discussions
    LT3479 Contact ADI Technical Support »
    LT3479 Ask your question »
    LT3479 Contact ADI Technical Support » LT3479 Ask your question »

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