1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. Internal Power Switch Buck Regulators
  6. LT1374

Data Sheet
JP
User Guides
2 View All

Overview

Features and Benefits

  • Constant 500kHz Switching Frequency
  • High Power 16-Pin TSSOP Package Available
  • Uses All Surface Mount Components
  • Inductor Size Reduced to 1.8µH
  • Saturating Switch Design: 0.07Ω
  • Effective Supply Current: 2.5mA
  • Shutdown Current: 20µA
  • Cycle-by-Cycle Current Limiting
  • Easily Synchronizable

Product Details

The LT1374 is a 500kHz monolithic buck mode switching regulator. A 4.5A switch is included on the die along with all the necessary oscillator, control and logic circuitry. High switching frequency allows a considerable reduction in the size of external components. The topology is current mode for fast transient response and good loop stability. Both fixed output voltage and adjustable parts are available.

A special high speed bipolar process and new design techniques achieve high efficiency at high switching frequency. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch.

The LT1374 is available in standard 7-pin DD, TO-220, fused lead SO-8 and 16-pin exposed pad TSSOP packages. Full cycle-by-cycle short-circuit protection and thermal shutdown are provided. Standard surface mount external parts may be used, including the inductor and capacitors. There is the optional function of shutdown or synchronization. A shutdown signal reduces supply current to 20µA. Synchronization allows an external logic level signal to increase the internal oscillator from 580kHz to 1MHz.

Applications

  • Portable Computers
  • Battery-Powered Systems
  • Battery Chargers
  • Distributed Power

Product Categories

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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 (5)

Documentation & Resources

  • View All (7)
  • Data Sheets (1)
  • Reliability Data (1)
  • Application Notes (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

    LT1374HV Demo Circuit - 4.5A, 500kHz Step-Down Switching Regulator (12V to 5V @ 3.75A)

    Models for the following parts are available in LTspice:

    LT1374
    LT1374-5
    LT1374HV
    LT1374HV-5

    Reference Designs (1)

    Product Recommendations

    LT1374 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.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
    LT1374CFE#PBF Material Declaration Reliability Data 16-Lead TSSOP w/ EP
    LT1374CFE#TRPBF Material Declaration Reliability Data 16-Lead TSSOP w/ EP
    LT1374CR#PBF Material Declaration Reliability Data 7-Lead DD Pak
    LT1374CR#TRPBF Material Declaration Reliability Data 7-Lead DD Pak
    LT1374CR-5#PBF Material Declaration Reliability Data 7-Lead DD Pak
    LT1374CR-5#TRPBF Material Declaration Reliability Data 7-Lead DD Pak
    LT1374CR-5SYNC#PBF Material Declaration Reliability Data 7-Lead DD Pak
    LT1374CR-5Sync#TRPBF Material Declaration Reliability Data 7-Lead DD Pak
    LT1374CR-SYNC#PBF Material Declaration Reliability Data 7-Lead DD Pak
    LT1374CR-Sync#TRPBF Material Declaration Reliability Data 7-Lead DD Pak
    LT1374CS8#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LT1374CS8#TRPBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LT1374CS8-5#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LT1374CS8-5#TRPBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LT1374CS8-5SYNC#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LT1374CS8-5Sync#TRPBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LT1374CS8-SYNC#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LT1374CS8-Sync#TRPBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LT1374CT7#PBF Material Declaration Reliability Data 7-Lead TO-220
    LT1374CT7-5#PBF Material Declaration Reliability Data 7-Lead TO-220
    LT1374HVCFE#PBF Material Declaration Reliability Data 16-Lead TSSOP w/ EP
    LT1374HVCFE#TRPBF Material Declaration Reliability Data 16-Lead TSSOP w/ EP
    LT1374HVCR#PBF Material Declaration Reliability Data 7-Lead DD Pak
    LT1374HVCR#TRPBF Material Declaration Reliability Data 7-Lead DD Pak
    LT1374HVCS8#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LT1374HVCS8#TRPBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LT1374HVIFE#PBF Material Declaration Reliability Data 16-Lead TSSOP w/ EP
    LT1374HVIFE#TRPBF Material Declaration Reliability Data 16-Lead TSSOP w/ EP
    LT1374HVIR#PBF Material Declaration Reliability Data 7-Lead DD Pak
    LT1374HVIR#TRPBF Material Declaration Reliability Data 7-Lead DD Pak
    LT1374HVIS8#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LT1374HVIS8#TRPBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LT1374IFE#PBF Material Declaration Reliability Data 16-Lead TSSOP w/ EP
    LT1374IFE#TRPBF Material Declaration Reliability Data 16-Lead TSSOP w/ EP
    LT1374IR#PBF Material Declaration Reliability Data 7-Lead DD Pak
    LT1374IR#TRPBF Material Declaration Reliability Data 7-Lead DD Pak
    LT1374IR-5#PBF Material Declaration Reliability Data 7-Lead DD Pak
    LT1374IR-5#TRPBF Material Declaration Reliability Data 7-Lead DD Pak
    LT1374IR-5SYNC#PBF Material Declaration Reliability Data 7-Lead DD Pak
    LT1374IR-SYNC#PBF Material Declaration Reliability Data 7-Lead DD Pak
    LT1374IS8#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LT1374IS8#TRPBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LT1374IS8-5#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LT1374IS8-5#TRPBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LT1374IS8-5SYNC#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LT1374IS8-SYNC#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LT1374IT7#PBF Material Declaration Reliability Data 7-Lead TO-220
    LT1374IT7-5#PBF Material Declaration Reliability Data 7-Lead TO-220
    Wafer Fabrication Data R388 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
    • LT1374CFE#PBF Production
    • LT1374CFE#TRPBF Production
    • LT1374CR#PBF Production
    • LT1374CR#TRPBF Production
    • LT1374CR-5#PBF Production
    • LT1374CR-5#TRPBF Production
    • LT1374CR-5SYNC#PBF Production
    • LT1374CR-5Sync#TRPBF Production
    • LT1374CR-SYNC#PBF Production
    • LT1374CR-Sync#TRPBF Production
    • LT1374CS8#PBF Production
    • LT1374CS8#TRPBF Production
    • LT1374CS8-5#PBF Production
    • LT1374CS8-5#TRPBF Production
    • LT1374CS8-5SYNC#PBF Production
    • LT1374CS8-5Sync#TRPBF Production
    • LT1374CS8-SYNC#PBF Production
    • LT1374CS8-Sync#TRPBF Production
    • LT1374CT7#PBF Production
    • LT1374CT7-5#PBF Production
    • LT1374HVCFE#PBF Production
    • LT1374HVCFE#TRPBF Production
    • LT1374HVCR#PBF Production
    • LT1374HVCR#TRPBF Production
    • LT1374HVCS8#PBF Production
    • LT1374HVCS8#TRPBF Production
    • LT1374HVIFE#PBF Production
    • LT1374HVIFE#TRPBF Production
    • LT1374HVIR#PBF Production
    • LT1374HVIR#TRPBF Production
    • LT1374HVIS8#PBF Production
    • LT1374HVIS8#TRPBF Production
    • LT1374IFE#PBF Production
    • LT1374IFE#TRPBF Production
    • LT1374IR#PBF Production
    • LT1374IR#TRPBF Production
    • LT1374IR-5#PBF Production
    • LT1374IR-5#TRPBF Production
    • LT1374IR-5SYNC#PBF Production
    • LT1374IR-SYNC#PBF Production
    • LT1374IS8#PBF Production
    • LT1374IS8#TRPBF Production
    • LT1374IS8-5#PBF Production
    • LT1374IS8-5#TRPBF Production
    • LT1374IS8-5SYNC#PBF Production
    • LT1374IS8-SYNC#PBF Production
    • LT1374IT7#PBF Production
    • LT1374IT7-5#PBF Production

    Support & Discussions

    LT1374 Discussions

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    LT1374 Contact ADI Technical Support »
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