Data Sheet
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Overview

Features and Benefits

  • Wide Input Range:
    • Operation from 3.6V to 36V
    • Overvoltage Lockout Protects Circuits through 60V Transients
  • 1A Output Current
  • Low Ripple Burst Mode® Operation
    • IQ = 75μA at 12VIN to 3.3VOUT
    • Output Ripple < 15mVP-P
  • Adjustable Switching Frequency: 250kHz to 2.2MHz
  • Short-Circuit Protected
  • Synchronizable Between 300kHz and 2.2MHz
  • 0.8V Feedback Reference Voltage
  • Output Voltage 0.8V to 20V
  • Soft-Start Capability
  • Power Good Flag
  • Small 12-Pin Thermally Enhanced 3mm × 3mm DFN Package

Product Details

The LT3682 is an adjustable frequency (250kHz to 2.2MHz) monolithic buck switching regulator that accepts input voltages up to 36V. A high efficiency 0.5Ω switch is included on the device along with a boost diode and the necessary oscillator, control, and logic circuitry. Current mode topology is used for fast transient response and good loop stability. A SYNC pin allows the user to synchronize the part to an external clock, and to choose between Low Ripple Burst Mode operation and standard PWM operation.

The Low Ripple Burst Mode maintains high efficiency at low output currents while keeping output ripple below 15mV in typical applications. Shutdown reduces input supply current to less than 1μA while a resistor and capacitor on the RUN/SS pin provide a controlled output voltage ramp (soft-start). A power good flag signals when VOUT reaches 90% of the programmed output voltage. Protection circuitry senses the current in the power switch and external Schottky catch diode to protect the LT3682 against short-circuit conditions. Frequency foldback and thermal shutdown provide additional protection.

The LT3682 is available in a 12-Pin 3mm × 3mm DFN with exposed pad for low thermal resistance.

Applications

  • Automotive Battery Regulation
  • Automotive Entertainment Systems
  • Industrial Supplies
  • Power for Portable Products
  • Distributed Supply Regulation

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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 (1)

Documentation & Resources

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  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (1)
  • Design Notes (1)
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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

    LT3682 Demo Circuit - 1A µPower Step-Down Regulator with 60V OV Protection (6.9-36V to 5V @ 1A)

    Models for the following parts are available in LTspice:

    LT3682

    Product Recommendations

    LT3682 Companion Parts

    Recommended Related Parts

    Recommended Suggested Oscillator

    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.

    LT3682 Material Declaration
    Quality And Reliability
    Symbols and Footprints

    Support & Discussions

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    LT3682 Ask your question »
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