1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. Internal Power Switch Buck Regulators
  6. LTC1475

Data Sheet
JP
User Guides
1 View All

Overview

Features and Benefits

  • High Efficiency: Over 92% Possible
  • Very Low Standby Current: 10µA Typ
  • Available in Space Saving 8-Lead MSOP Package
  • Internal 1.4Ω Power Switch (VIN = 10V)
  • Wide VIN Range: 3V to 18V Operation
  • Very Low Dropout Operation: 100% Duty Cycle
  • Low-Battery Detector Functional During Shutdown
  • Programmable Current Limit with Optional Current Sense Resistor (10mA to 400mA Typ)
  • Short-Circuit Protection
  • Few External Components Required
  • Active Low Micropower Shutdown: IQ = 6µA Typ
  • Pushbutton On/Off (LTC1475 Only)
  • 3.3V, 5V and Adjustable Output Versions

Product Details

The LTC1474/LTC1475 series are high efficiency step-down converters with internal P-channel MOSFET power switches that draw only 10µA typical DC supply current at no load while maintaining output voltage. The LTC1474 uses logic-controlled shutdown while the LTC1475 features pushbutton on/off.

The low supply current coupled with Burst Mode™ operation enables the LTC1474/LTC1475 to maintain high efficiency over a wide range of loads. These features, along with their capability of 100% duty cycle for low dropout and wide input supply range, make the LTC1474/LTC1475 ideal for moderate current (up to 300mA) battery-powered applications.

The peak switch current is user-programmable with an optional sense resistor (defaults to 325mA minimum if not used) providing a simple means for optimizing the design for lower current applications. The peak current control also provides short-circuit protection and excellent start-up behavior. A low-battery detector that remains functional in shutdown is provided.

The LTC1474/LTC1475 series availability in 8-lead MSOP and SO packages and need for few additional components provide for a minimum area solution.

Applications

  • Cellular Telephones and Wireless Modems
  • 4mA to 20mA Current Loop Step-Down Converter
  • Portable Instruments
  • Battery-Operated Digital Devices
  • Battery Chargers
  • Inverting Converters
  • Intrinsic Safety Applications

Product Categories

Comparable Parts Click to see all in Parametric Search

Product Lifecycle icon-recommended Production

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

  • View All (6)
  • Data Sheets (1)
  • Reliability Data (1)
  • Application Notes (1)
  • User Guides (1)
  • 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.

    LTspice

    Models for the following parts are available in LTspice:

    LTC1475
    LTC1475-3.3
    LTC1475-5

    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
    LTC1475CMS8#PBF Material Declaration Reliability Data 8-Lead MSOP
    LTC1475CMS8#TRPBF Material Declaration Reliability Data 8-Lead MSOP
    LTC1475CMS8-3.3#PBF Material Declaration Reliability Data 8-Lead MSOP
    LTC1475CMS8-3.3#TRPBF Material Declaration Reliability Data 8-Lead MSOP
    LTC1475CMS8-5#PBF Material Declaration Reliability Data 8-Lead MSOP
    LTC1475CMS8-5#TRPBF Material Declaration Reliability Data 8-Lead MSOP
    LTC1475CS8#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LTC1475CS8#TRPBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LTC1475CS8-3.3#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LTC1475CS8-3.3#TRPBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LTC1475CS8-5#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LTC1475CS8-5#TRPBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LTC1475IS8#PBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    LTC1475IS8#TRPBF Material Declaration Reliability Data 8-Lead SOIC (Narrow 0.15 Inch)
    Wafer Fabrication Data R245 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
    • LTC1475CMS8#PBF Production
    • LTC1475CMS8#TRPBF Production
    • LTC1475CMS8-3.3#PBF Production
    • LTC1475CMS8-3.3#TRPBF Production
    • LTC1475CMS8-5#PBF Production
    • LTC1475CMS8-5#TRPBF Production
    • LTC1475CS8#PBF Production
    • LTC1475CS8#TRPBF Production
    • LTC1475CS8-3.3#PBF Production
    • LTC1475CS8-3.3#TRPBF Production
    • LTC1475CS8-5#PBF Production
    • LTC1475CS8-5#TRPBF Production
    • LTC1475IS8#PBF Production
    • LTC1475IS8#TRPBF Production

    Support & Discussions

    LTC1475 Discussions

    Negative output Voltage
    All LTC1475 Discussions
    LTC1475 Contact ADI Technical Support »
    LTC1475 Ask your question »
    LTC1475 Contact ADI Technical Support » LTC1475 Ask your question »

    Sample & Buy


    Ordering FAQs


    See our Ordering FAQs for answers to questions about online orders, payment options and more.

     

    Buy Now Pricing


    (**) Displayed Buy Now Price and Price Range is based on small quantity orders.

     

    List Pricing


    (*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

     

    Lead Times


    Please see the latest communication from our CCO regarding lead times.

     

    Sampling


    Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.


    Price Table Help

     

    Evaluation Boards

    Pricing displayed is based on 1-piece.

    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.

    •