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  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. Internal Power Switch Buck Regulators
  6. LT3970

Data Sheet Rev. D
JP
User Guides
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Overview

Features and Benefits

  • Low Ripple Burst Mode® Operation
    • 2.5µA IQ at 12VIN to 3.3VOUT
    • Output Ripple < 5mVP-P
  • Wide Input Voltage Range: 4.2V to 40V Operating
  • Adjustable Switching Frequency: 200kHz to 2.2MHz
  • Integrated Boost and Catch Diodes
  • 350mA Output Current
  • Fixed Output Voltages:
    • 3.3V, 3.42V, 5V
    • 1.8μA IQ at 12VIN
  • Accurate 1V Enable Pin Threshold
  • Low Shutdown Current: IQ = 0.7μA
  • Internal Sense Limits Catch Diode Current
  • Power Good Flag
  • Output Voltage: 1.21V to 25V
  • Internal Compensation
  • Small 10-Pin MSOP and (3mm × 2mm) DFN Packages
  • AEC-Q100 Qualified for Automotive Applications

Product Details

The LT3970 is an adjustable frequency monolithic buck switching regulator that accepts a wide input voltage range up to 40V, and consumes only 2.5μA of quiescent current. A high efficiency switch is included on the die along with the catch diode, boost diode, and the necessary oscillator, control and logic circuitry. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping the output ripple below 5mV in a typical application. Current mode topology is used for fast transient response and good loop stability. A catch diode current limit provides protection against shorted outputs and overvoltage conditions. An enable pin with accurate threshold is available, producing a low shutdown current of 0.7μA. A power good flag signals when VOUT reaches 90% of the programmed output voltage. The LT3970 is available in small 10-pin MSOP and 3mm × 2mm DFN packages.

Applications

  • Automotive Battery Regulation
  • Power for Portable Products
  • Industrial Supplies

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Evaluation Kits (1)

Documentation & Resources

  • View All (5)
  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (1)
  • Videos (1)
  • Press Releases (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

    LT3970 Demo Circuit - 40V, 350mA Step-Down Regulator with 2.5µA Iq & Integrated Diodes (12V to 5V @ 0.35A)

    Models for the following parts are available in LTspice:

    LT3970
    LT3970-3.3
    LT3970-5

    Product Recommendations

    LT3970 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
    LT3970EDDB#TRMPBF Material Declaration Reliability Data 10-Lead DFN (3mm x 2mm w/ EP)
    LT3970EDDB#TRPBF Material Declaration Reliability Data 10-Lead DFN (3mm x 2mm w/ EP)
    LT3970EDDB-3.3#TRMPBF Material Declaration Reliability Data 10-Lead DFN (3mm x 2mm w/ EP)
    LT3970EDDB-3.3#TRPBF Material Declaration Reliability Data 10-Lead DFN (3mm x 2mm w/ EP)
    LT3970EDDB-3.42#TRMPBF Material Declaration Reliability Data 10-Lead DFN (3mm x 2mm w/ EP)
    LT3970EDDB-3.42#TRPBF Material Declaration Reliability Data 10-Lead DFN (3mm x 2mm w/ EP)
    LT3970EDDB-5#TRMPBF Material Declaration Reliability Data 10-Lead DFN (3mm x 2mm w/ EP)
    LT3970EDDB-5#TRPBF Material Declaration Reliability Data 10-Lead DFN (3mm x 2mm w/ EP)
    LT3970EMS#PBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970EMS#TRPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970EMS#WPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970EMS#WTRPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970EMS-3.3#PBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970EMS-3.3#TRPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970EMS-3.3#WPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970EMS-3.3#WTRPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970EMS-5#PBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970EMS-5#TRPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970EMS-5#WPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970EMS-5#WTRPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970HMS#PBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970HMS#TRPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970HMS#WPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970HMS#WTRPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970HMS-3.3#PBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970HMS-3.3#TRPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970HMS-3.3#WPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970HMS-3.3#WTRPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970HMS-5#PBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970HMS-5#TRPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970HMS-5#WPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970HMS-5#WTRPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970IDDB#TRMPBF Material Declaration Reliability Data 10-Lead DFN (3mm x 2mm w/ EP)
    LT3970IDDB#TRPBF Material Declaration Reliability Data 10-Lead DFN (3mm x 2mm w/ EP)
    LT3970IDDB-3.3#TRMPBF Material Declaration Reliability Data 10-Lead DFN (3mm x 2mm w/ EP)
    LT3970IDDB-3.3#TRPBF Material Declaration Reliability Data 10-Lead DFN (3mm x 2mm w/ EP)
    LT3970IDDB-5#TRMPBF Material Declaration Reliability Data 10-Lead DFN (3mm x 2mm w/ EP)
    LT3970IDDB-5#TRPBF Material Declaration Reliability Data 10-Lead DFN (3mm x 2mm w/ EP)
    LT3970IMS#PBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970IMS#TRPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970IMS#WPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970IMS#WTRPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970IMS-3.3#PBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970IMS-3.3#TRPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970IMS-3.3#WPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970IMS-3.3#WTRPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970IMS-5#PBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970IMS-5#TRPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970IMS-5#WPBF Material Declaration Reliability Data 10-Lead MSOP
    LT3970IMS-5#WTRPBF Material Declaration Reliability Data 10-Lead MSOP
    Wafer Fabrication Data R530 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
    • LT3970EMS#PBF Production
    • LT3970EMS#TRPBF Production
    • LT3970EMS#WPBF Production
    • LT3970EMS#WTRPBF Production
    • LT3970EMS-3.3#PBF Production
    • LT3970EMS-3.3#TRPBF Production
    • LT3970EMS-3.3#WPBF Production
    • LT3970EMS-3.3#WTRPBF Production
    • LT3970EMS-5#PBF Production
    • LT3970EMS-5#TRPBF Production
    • LT3970EMS-5#WPBF Production
    • LT3970EMS-5#WTRPBF Production
    • LT3970HMS#PBF Production
    • LT3970HMS#TRPBF Production
    • LT3970HMS#WPBF Production
    • LT3970HMS#WTRPBF Production
    • LT3970HMS-3.3#PBF Production
    • LT3970HMS-3.3#TRPBF Production
    • LT3970HMS-3.3#WPBF Production
    • LT3970HMS-3.3#WTRPBF Production
    • LT3970HMS-5#PBF Production
    • LT3970HMS-5#TRPBF Production
    • LT3970HMS-5#WPBF Production
    • LT3970HMS-5#WTRPBF Production
    • LT3970IMS#PBF Production
    • LT3970IMS#TRPBF Production
    • LT3970IMS#WPBF Production
    • LT3970IMS#WTRPBF Production
    • LT3970IMS-3.3#PBF Production
    • LT3970IMS-3.3#TRPBF Production
    • LT3970IMS-3.3#WPBF Production
    • LT3970IMS-3.3#WTRPBF Production
    • LT3970IMS-5#PBF Production
    • LT3970IMS-5#TRPBF Production
    • LT3970IMS-5#WPBF Production
    • LT3970IMS-5#WTRPBF Production

    Support & Discussions

    LT3970 Discussions

    RE: Backfeed voltage into LT3970 switcher
    All LT3970 Discussions
    LT3970 Contact ADI Technical Support »
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    LT3970 Contact ADI Technical Support » LT3970 Ask your question »

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