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3 to 5-Series Cell Li-Ion and Li-Phosphate Battery Monitor (bq76940 Family)

 

Features for the BQ76920

 

    • AFE monitoring features
      • Pure digitalinterface
      • Internal ADC measures cell voltage, die temperature, and externalthermistor
      • A separate, internal ADC measures pack current (coulombcounter)
      • Directly supports up to three thermistors(103AT)
  • Hardware protection features
    • Overcurrent in Discharge(OCD)
    • Short Circuit in Discharge (SCD)
    • Overvoltage(OV)
    • Undervoltage (UV)
    • Secondary protector faultdetection
  • Additional features
    • Integrated cell balancing FETs
    • Charge, discharge low-side NCH FETdrivers
    • Alert interrupt to host microcontroller
    • 2.5-V or3.3-V output voltage regulator
    • No EEPROM programmingnecessary
    • High supply voltage absolute maximum (up to 108V)
    • Simple I2C compatible interface (CRCoption)
    • Random cell connection tolerant

 

Description for the BQ76920

 

The bq769x0 familyof robust analog front-end (AFE) devices serves as part of a complete pack monitoring andprotection solution for next-generation, high-power systems, such as light electric vehicles, powertools, and uninterruptible power supplies. The bq769x0 is designed with low power in mind: Sub-blocks within the IC maybe enabled or disabled to control the overall chip current consumption, and a SHIP mode provides asimple way to put the pack into an ultra-low power state.

The bq76920 device supports up to 5-seriescells or typical 18-V packs, the bq76930 handles up to 10-series cells or typical 36-V packs, andthe bq76940 works for up to 15-series cells or typical 48-V packs. Avariety of battery chemistries may be managed with these AFEs, including Lithium Ion, Lithium ironphosphate, and more. Through I2C, a host controller can use thebq769x0 to implement manybattery pack management functions, such as monitoring (cell voltages, pack current, packtemperatures), protection (controlling charge/discharge FETs), and balancing. Integrated A/Dconverters enable a purely digital readout of critical system parameters, with calibration handledin TI’s manufacturing process.