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  6. LT8697

Data Sheet
PDF
JP
User Guide
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Overview

Features and Benefits

  • Wide Input Range: 5V to 42V
  • Low Dropout Under All Conditions: 450mV at 2.1A
  • Accurate 5V Output: ±1.3% Over Full Temperature Range
  • Programmable Cable Drop Compensation
  • Programmable Output Current Limit
  • Output Current Monitor
  • Dual Input Feedback Permits Regulation on Output of USB Switch
  • Forced Continuous Mode for Fast Load Step Response
  • High Efficiency Synchronous Operation at 2MHz:
    • 93% Efficiency at 2.1A, 5VOUT from 12VIN
    • 95% Efficiency at 0.9A, 5VOUT from 12VIN
  • Fast Minimum Switch-On Time: 45ns
  • Adjustable Output from 5.0V to 5.25V
  • Adjustable and Synchronizable: 300kHz to 2.2MHz
  • Small Thermally Enhanced 3mm × 5mm 24-Lead QFN Package

Product Details

The LT8697 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator designed to power 5V USB applications. A precise output voltage and programmable cable drop compensation maintain accurate 5V regulation at the USB socket connected to the end of a long cable. Forced continuous operation allows the LT8697 to sink current, further enhancing accurate 5V regulation during load transients.

Accurate and programmable output current limit, a power good indicator pin and an output current monitor pin improve system reliability and safety, allow the user to implement latch-off or auto-retry functionality and can eliminate the need for a USB switch IC. Dual feedback allows regulation on the output of a USB switch and limits cable drop compensation to a maximum of 5.8V output, protecting USB devices during fault conditions. Thermal shutdown provides additional protection by limiting power dissipation in the IC during an overtemperature fault.

The LT8697 is available in a small 24-lead 3mm × 5mm package with an exposed pad for low thermal resistance.

Applications

  • Automotive and Industrial USB
  • Precision 5V Supply

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This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

Documentation & Resources

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  • Data Sheet (1)
  • Reliability Data (1)
  • User Guide (1)
  • Video (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

    LT8697 Demo Circuit - 2MHz 5V Step-Down Converter with Cable Drop Compensation (6-42V to 5V @ 2.1A)

    Models for the following parts are available in LTspice:

    LT8697

    Product Recommendations

    LT8697 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
    LT8697EUDD#PBF Material Declaration Reliability Data 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)
    LT8697EUDD#TRPBF Material Declaration Reliability Data 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)
    LT8697HUDD#PBF Material Declaration Reliability Data 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)
    LT8697HUDD#TRPBF Material Declaration Reliability Data 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)
    LT8697IUDD#PBF Material Declaration Reliability Data 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)
    LT8697IUDD#TRPBF Material Declaration Reliability Data 24-Lead QFN (3mm x 5mm x 0.75mm w/ EP)
    Wafer Fabrication Data R570 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
    • LT8697EUDD#PBF Production
    • LT8697EUDD#TRPBF Production
    • LT8697HUDD#PBF Production
    • LT8697HUDD#TRPBF Production
    • LT8697IUDD#PBF Production
    • LT8697IUDD#TRPBF Production

    Support & Discussions

    LT8697 Contact ADI Technical Support »
    LT8697 Ask your question »
    LT8697 Contact ADI Technical Support » LT8697 Ask your question »

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    Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

    Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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