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

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 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)

Tools & Simulations

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Models for the following parts are available in LTspice:

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Product Recommendations

LTC2945 Companion Parts

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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.

Discussions

LTC2945 Discussions

Re: LTC2945 communication problem
7 week(s) ago in Power By Linear
Re: LTC2945 communication problem
7 week(s) ago in Power By Linear
LTC2945 communication problem
7 week(s) ago in Power By Linear
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The USA 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. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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Evaluation Boards Pricing displayed is based on 1-piece.
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.