LTC2945 - Wide Range I2C Power Monitor

The LTC?2945 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.

  • 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
Typical Application
LTC2945 Typical Application
LTC2945 Typical Application
LTC2945 Typical Application
  • Telecom Infrastructure
  • Industrial
  • Automotive
  • Consumer
LTC2945 Package Drawing
LTC2945 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC2945CUD-1#PBF3x3 QFN-12C$5.10$3.57
LTC2945CUD-1#TRPBF3x3 QFN-12C$3.63
LTC2945CUD#PBF3x3 QFN-12C$5.10$3.57
LTC2945CUD#TRPBF3x3 QFN-12C$3.63
LTC2945HUD-1#PBF3x3 QFN-12H$6.74$4.72
LTC2945HUD-1#TRPBF3x3 QFN-12H$4.78
LTC2945HUD#PBF3x3 QFN-12H$6.74$4.72
LTC2945HUD#TRPBF3x3 QFN-12H$4.78
LTC2945IUD-1#PBF3x3 QFN-12I$5.87$4.11
LTC2945IUD-1#TRPBF3x3 QFN-12I$4.17
LTC2945IUD#PBF3x3 QFN-12I$5.87$4.11
LTC2945IUD#TRPBF3x3 QFN-12I$4.17
Demo Boards
Part NumberDescriptionPrice
DC1697ALTC2945 Demo Board | Wide Range I2C Power Monitor (requires DC2026)$75.00
Companion Boards
Part NumberDescriptionPrice
DC2026CLinduino One Isolated USB Demo Board: An Arduino- and QuikEval-Compatible Code Development Platform$75.00
Reliability Data
Product Selector Card
LT Journal
Press Release
CAD Symbol
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LTC2945 - Wide Range I2C Power Monitor
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R567 - Reliability Data
Power and Thermal Monitoring
Wide Range I2C Power Monitor
3mm × 3mm QFN IC Directly Monitors 0V to 80V Supplies: Features I2C Interface, Peak Value Tracking and Runs from Any Supply
Rail-to-Rail 80V Power Monitor Measures Current & Voltage with +/-0.75% Accuracy
LTC2945 Footprints and Symbols
LTC2945 - DC1697A Linduino .INO File
LTC2945 Linduino .CPP File
LTC2945 Linduino Header File
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