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Texas Instruments bq769x0 Li-Ion & Li-Phosphate Battery Monitors

Texas Instruments bq769x0 Li-Ion & Li-Phosphate Battery Monitors are a robust analog front-end (AFE) devices that serves as part of a complete pack monitoring and protection solution for next-generation, high-power systems, such as light electric vehicles, power tools, and uninterruptible power supplies. The Texas Instruments bq769x0 is designed with low power in mind: Sub-blocks within the IC may be enabled/disabled to control the overall chip current consumption, and a SHIP mode provides a simple way to put the pack into an ultra-low power state.

Features

  • AFE monitoring features
    • Pure digital interface
    • Internal ADC measures cell voltage, die temperature, and external thermistor
    • A separate, internal ADC measures pack current (coulomb counter)
    • 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 fault detection
  • Additional features
    • Integrated cell balancing FETs
    • Charge, discharge low-side NCH FET drivers
    • Alert interrupt to host microcontroller
    • 2.5V or 3.3V output voltage regulator
    • No EEPROM programming necessary
    • High supply voltage absolute maximum (up to 108V)
    • Simple I2C compatible interface (CRC option)
    • Random cell connection tolerant

Applications

  • Light Electric Vehicles (LEV): eBikes, eScooters, Pedelec, and pedal-assist bicycles
  • Power and gardening tools
  • Wireless base station backup systems
  • Battery backup and UPS systems
  • 12V, 18V, 24V, 36V, and 48V battery packs

Block Diagram

Block Diagram - Texas Instruments bq769x0 Li-Ion & Li-Phosphate Battery Monitors

Related Development Tools

Texas Instruments bq76930EVM Li-Ion & Phosphate Evaluation Module

Populated circuit board for evaluation of the bq76930 AFE & bq78350 Battery Management Controller.

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Texas Instruments bq76920EVM Evaluation Module

PCB for evaluation of the bq7692000 AFE and the bq78350 Battery Management Controller.

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Published: 2014-12-17 | Updated: 2024-06-04