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Texas Instruments bq79758-Q1 18S Battery Monitor & Balancer

Texas Instruments bq79758-Q1 18S Battery Monitor and Balancer provides high-accuracy cell voltage measurements for up to 18S battery modules in high-voltage battery management systems in xEV/EV. The monitor offers different channel options in the same package type, providing pin-to-pin compatibility and supporting high reuse of the established software and hardware across any platform. This device has a state-of-the-art ADC architecture/measurement system, meeting stringent automotive standards and safety requirements. With the daisy chain isolated by a transformer (or capacitor), the Texas Instruments bq79758-Q1 is suitable for centralized or distributed architectures in an xEV powertrain.

Features

  • AEC-Q100 qualified with the following results
    • Device temperature grade 1
    • -40°C to +125°C ambient operating temperature range
  • Functional safety-compliant
    • Documentation to aid ISO 26262 system design
    • Systematic capability up to ASIL D
    • Hardware capability up to ASIL D
  • Measure 9 to 18 batteries in series per device, stackable up to 64 devices
  • Dedicated ADC with typical ±1mV accuracy
  • Two independent current sense ADCs with ±0.1% gain error drift and input range +/-275mV
  • Programmable over-current detection comparators
  • Support limp home mode with full redundancy
  • Integrated post-ADC configurable digital low-pass filters
  • Supports busbar without affecting measurement accuracy
  • 10 GPIOs for temp sensor/analog/digital/I2C controller/SPI controller
  • Internal cell balancing
    • Balancing at 300mA
    • User-controlled PWM adjustment cell balancing current
    • Built-in balancing thermal management with automatic pause and resume control
  • Robust daisy chain communication and support for Ring Architecture
  • Hardware reset by the host simulates a POR-like event without battery removal
  • On-chip memory for one-time custom programming
  • Low power mode current of < 6µA
  • Compatible with bq79600-Q1 with SPI/UART interface

Applications

  • Battery Management System (BMS) in hybrid and electric powertrain systems
  • Energy storage battery packs with Battery Management Systems

Simplified System Diagram

Application Circuit Diagram - Texas Instruments bq79758-Q1 18S Battery Monitor & Balancer

Additional Resources

Related Product

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Published: 2024-10-16 | Updated: 2025-05-09