1. Products
  2. Power Management
  3. Battery Management
  4. Battery Fuel Gauge and Coulomb Counter
  5. LTC2949


Features and Benefits

  • Measures Battery Stack Voltage, Current and Power
  • Indicates Accumulated Battery Charge and Energy
  • 20-Bit Current Measurement with <1μV Offset
  • Built-In Isolated isoSPI or SPI Interface
  • LTC68xx/ADBMS68xx Compatible, Supports Synchronous Measurements with Cell Monitors
  • Up to 12 Buffered Voltage Measurement Inputs
  • Up to 5 GPIOs, Configurable to Drive Ground, Supply or Toggling at 400kHz
  • High or Low Side Current Sense
  • 0.3% Current and Voltage Accuracy
  • 1% Energy and Charge Accuracy
  • True Average ADCs
  • I2C EEPROM Interface to Store Board Calibration Factors
  • Threshold Registers for all Measured Quantities
  • Engineered for ISO26262 Compliant Systems
  • Open Wire Detection on Input Pins
  • Available in 48-Lead LQFP Package
  • AEC-Q100 Qualified for Automotive Applications

Product Details

The LTC2949 is a high precision current, voltage, temperature, charge and energy meter for electrical and hybrid vehicles and other isolated current sense applications. It infers charge and energy flowing in and out of the battery pack by monitoring simultaneously the voltage drop over up to two sense resistors and the battery pack voltage.

Low offset ΔΣ ADCs ensure accurate measurement of voltage and current with insignificant power loss. Continuous integration of current and power ensures lossless tracking of charge and energy delivered or received by the battery pack.

The built-in serial interface can be configured to support isolated isoSPI communication to the host or as SPI interface.

The LTC2949 features 12 internally buffered high impedance inputs (V1 to V12) for measuring voltages from external sensors or resistor dividers allowing to measure temperatures, HV-Link voltages, chassis isolation and supervise contactor states. LTC2949 has up to five programmable digital outputs which can be set to ground, supply or toggling at 400kHz.

Programmable threshold and tracking registers reduce digital traffic to the host.


  • Electric and Hybrid Vehicles
  • Isolated Current Sensing
  • Backup Battery Systems
  • High Power Portable Equipment

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 (2)

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
LTC2949HLXE#3ZZPBF Material Declaration Reliability Data 48-Lead LQFP (7mm x 7mm w/ EP)
LTC2949HLXE#3ZZTRPBF Material Declaration Reliability Data 48-Lead LQFP (7mm x 7mm w/ EP)
LTC2949ILXE#3ZZPBF Material Declaration Reliability Data 48-Lead LQFP (7mm x 7mm w/ EP)
LTC2949ILXE#3ZZTRPBF Material Declaration Reliability Data 48-Lead LQFP (7mm x 7mm w/ EP)
Wafer Fabrication Data R567 Reliability Data

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Lead Times

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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.