1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. Internal Power Switch Buck Regulators
  6. LT3502

Data Sheet
JP
User Guides
3 View All

Overview

Features and Benefits

  • 3V to 40V Input Voltage Range
  • 500mA Output Current
  • Switching Frequency: 2.2MHz (LT3502A), 1.1MHz (LT3502)
  • 800mV Feedback Voltage
  • Short-Circuit Robust
  • Soft-Start
  • Low Shutdown Current: <2μA
  • Internally Compensated
  • Internal Boost Diode
  • Thermally Enhanced 2mm × 2mm 8-Lead DFN and 10-Lead MS10 Package

Product Details

The LT3502/LT3502A are current mode PWM step-down DC/DC converters with an internal 500mA power switch, in tiny 8-lead 2mm × 2mm DFN and 10-lead MS10 packages. The wide input voltage range of 3V to 40V makes the LT3502/LT3502A suitable for regulating power from a wide variety of sources, including 24V industrial supplies and automotive batteries. Its high operating frequency allows the use of tiny, low cost inductors and capacitors, resulting in a very small solution. Constant frequency above the AM band avoids interfering with radio reception, making the LT3502A particularly suitable for automotive applications.

Cycle-by-cycle current limit and frequency foldback provide protection against shorted outputs. Soft-start and frequency foldback eliminates input current surge during start-up. DA current sense provides further protection in fault conditions. An internal boost diode reduces component count.

Applications

  • Automotive Systems
  • Battery-Powered Equipment
  • Wall Transformer Regulation
  • 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 (3)

Documentation & Resources

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  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (3)
  • Press Releases (1)
    • Document Type

    Tools & Simulations

    LTspice

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    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

    LT3502 Demo Circuit - 1.1MHz, 500mA, Step-Down Regulator (7-40V to 5V @ 500mA)
    LT3502A Demo Circuit - 2.2MHz, 500mA, Step-Down Regulator (7-40V to 5V @ 500mA)

    Models for the following parts are available in LTspice:

    LT3502
    LT3502A

    Reference Designs (1)

    Product Recommendations

    LT3502 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
    LT3502AEDC#TRMPBF Material Declaration Reliability Data 8-Lead DFN (2mm x 2mm w/ EP)
    LT3502AEDC#TRPBF Material Declaration Reliability Data 8-Lead DFN (2mm x 2mm w/ EP)
    LT3502AEMS#PBF Material Declaration Reliability Data 10-Lead MSOP
    LT3502AEMS#TRPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3502AIDC#TRMPBF Material Declaration Reliability Data 8-Lead DFN (2mm x 2mm w/ EP)
    LT3502AIDC#TRPBF Material Declaration Reliability Data 8-Lead DFN (2mm x 2mm w/ EP)
    LT3502AIMS#PBF Material Declaration Reliability Data 10-Lead MSOP
    LT3502AIMS#TRPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3502EDC#TRMPBF Material Declaration Reliability Data 8-Lead DFN (2mm x 2mm w/ EP)
    LT3502EDC#TRPBF Material Declaration Reliability Data 8-Lead DFN (2mm x 2mm w/ EP)
    LT3502EMS#PBF Material Declaration Reliability Data 10-Lead MSOP
    LT3502EMS#TRPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3502IDC#TRMPBF Material Declaration Reliability Data 8-Lead DFN (2mm x 2mm w/ EP)
    LT3502IDC#TRPBF Material Declaration Reliability Data 8-Lead DFN (2mm x 2mm w/ EP)
    LT3502IMS#PBF Material Declaration Reliability Data 10-Lead MSOP
    LT3502IMS#TRPBF Material Declaration Reliability Data 10-Lead MSOP
    Wafer Fabrication Data R530 Reliability Data

    PCN-PDN Information

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    Select Model for PCN Information
    • LT3502AEMS#PBF Production
    • LT3502AEMS#TRPBF Production
    • LT3502AIMS#PBF Production
    • LT3502AIMS#TRPBF Production
    • LT3502EMS#PBF Production
    • LT3502EMS#TRPBF Production
    • LT3502IMS#PBF Production
    • LT3502IMS#TRPBF Production

    Support & Discussions

    LT3502 Contact ADI Technical Support »
    LT3502 Ask your question »
    LT3502 Contact ADI Technical Support » LT3502 Ask your question »

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