1. Products
  2. Amplifiers
  3. Specialty Amplifiers
  4. Current Sense Amplifiers
  5. LTC2945

Data Sheet Rev. C
PDF
JP
User Guide
1 View All

Overview

Features and Benefits

  • Rail-to-Rail Input Range: 0V to 80V
  • Wide Input Supply Range: 2.7V to 80V
  • Shunt Regulator for Supplies >80V
  • ΔΣ ADC with less than ±0.75% Total Unadjusted Error
  • 12-Bit Resolution for Current and Voltages
  • Internal Multiplier Calculates 24-Bit Power Value
  • Stores Minimum and Maximum Values
  • Alerts When Limits Exceeded
  • Additional ADC Input Monitors an External Voltage
  • Continuous Scan and Snapshot Modes
  • Shutdown Mode with IQ < 80μA
  • Split SDA for Opto-Isolation
  • Available in 12-Lead 3mm × 3mm QFN and MSOP Packages
  • AEC-Q100 Qualified for Automotive Applications

Product Details

The LTC2945 is a rail-to-rail system monitor that measures current, voltage, and power. It features an operating range of 2.7V to 80V and includes a shunt regulator for supplies above 80V to allow flexibility in the selection of input supply. The current measurement range of 0V to 80V is independent of the input supply. An onboard 0.75% accurate 12-bit ADC measures load current, input voltage and an auxiliary external voltage. A 24-bit power value is generated by digitally multiplying the measured 12-bit load current and input voltage data. Minimum and maximum values are stored and an overrange alert with programmable thresholds minimizes the need for software polling. Data is reported via a standard I2C interface. Shutdown mode reduces power consumption to 20μA.

The LTC2945 I2C interface includes separate data input and output pins for use with standard or opto-isolated I2C connections. The LTC2945-1 has an inverted data output for use with inverting opto-isolator configurations.

APPLICATIONS

  • Telecom Infrastructure
  • Industrial
  • Automotive
  • Consumer

Product Categories

Comparable Parts Click to see all in Parametric Search

Product Lifecycle icon-recommended Recommended for New Designs

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

  • View All (9)
  • Data Sheet (1)
  • Reliability Data (1)
  • User Guide (1)
  • Product Selector Card (3)
  • Video (1)
  • Technical Article (2)
    • 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:

    LTC2945

    Linduino

    Linduino is Analog Devices’ Arduino compatible system for developing and distributing firmware libraries and example code for our integrated circuits. Each Linduino-supported product includes an example main program, defined in the LTSketchbook/Part Number folder and driver code, defined in the LTSketchbook/libraries folder.

    Linduino code repository on GitHub and instructions on how to use the code.

    Purchase Linduino

    Linduino

    Code Files

    LTC2945 - DC1697A Linduino .INO File
    LTC2945 Linduino Header File
    LTC2945 Linduino .CPP File

    Reference Designs (1)

    Product Recommendations

    LTC2945 Companion Parts

    Recommended µModule Isolator

    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
    LTC2945CMS#PBF Material Declaration Reliability Data 12-Lead MSOP
    LTC2945CMS#TRPBF Material Declaration Reliability Data 12-Lead MSOP
    LTC2945CMS-1#PBF Material Declaration Reliability Data 12-Lead MSOP
    LTC2945CMS-1#TRPBF Material Declaration Reliability Data 12-Lead MSOP
    LTC2945CUD#PBF Material Declaration Reliability Data 12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)
    LTC2945CUD#TRPBF Material Declaration Reliability Data 12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)
    LTC2945CUD-1#PBF Material Declaration Reliability Data 12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)
    LTC2945CUD-1#TRPBF Material Declaration Reliability Data 12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)
    LTC2945HMS#PBF Material Declaration Reliability Data 12-Lead MSOP
    LTC2945HMS#TRPBF Material Declaration Reliability Data 12-Lead MSOP
    LTC2945HMS-1#PBF Material Declaration Reliability Data 12-Lead MSOP
    LTC2945HMS-1#TRPBF Material Declaration Reliability Data 12-Lead MSOP
    LTC2945HUD#PBF Material Declaration Reliability Data 12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)
    LTC2945HUD#TRPBF Material Declaration Reliability Data 12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)
    LTC2945HUD#WPBF Material Declaration Reliability Data 12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)
    LTC2945HUD#WTRPBF Material Declaration Reliability Data 12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)
    LTC2945HUD-1#PBF Material Declaration Reliability Data 12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)
    LTC2945HUD-1#TRPBF Material Declaration Reliability Data 12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)
    LTC2945IMS#PBF Material Declaration Reliability Data 12-Lead MSOP
    LTC2945IMS#TRPBF Material Declaration Reliability Data 12-Lead MSOP
    LTC2945IMS-1#PBF Material Declaration Reliability Data 12-Lead MSOP
    LTC2945IMS-1#TRPBF Material Declaration Reliability Data 12-Lead MSOP
    LTC2945IUD#PBF Material Declaration Reliability Data 12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)
    LTC2945IUD#TRPBF Material Declaration Reliability Data 12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)
    LTC2945IUD-1#PBF Material Declaration Reliability Data 12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)
    LTC2945IUD-1#TRPBF Material Declaration Reliability Data 12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)
    Wafer Fabrication Data R567 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
    • LTC2945CMS#PBF Production
    • LTC2945CMS#TRPBF Production
    • LTC2945CMS-1#PBF Production
    • LTC2945CMS-1#TRPBF Production
    • LTC2945HMS#PBF Production
    • LTC2945HMS#TRPBF Production
    • LTC2945HMS-1#PBF Production
    • LTC2945HMS-1#TRPBF Production
    • LTC2945IMS#PBF Production
    • LTC2945IMS#TRPBF Production
    • LTC2945IMS-1#PBF Production
    • LTC2945IMS-1#TRPBF Production

    Support & Discussions

    LTC2945 Discussions

    RE: LTC2945
    RE: LTC2945
    All LTC2945 Discussions
    LTC2945 Contact ADI Technical Support »
    LTC2945 Ask your question »
    LTC2945 Contact ADI Technical Support » LTC2945 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


    A Sample link will be shown above, next to the part, only for parts that are included in our sample program. Selecting the Sample button 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.

    •