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Texas Instruments BQ79758B-Q1 Battery Monitor

Texas Instruments BQ79758B-Q1 Battery Monitor is an automotive, 18-S ASIL-D compliant, precise battery monitor and balancer with current sensing capabilities. This monitor offers various channel options in the same package type, providing pin-to-pin compatibility. The BQ79758B-Q1 monitor device features a state-of-the-art ADC architecture/measurement system meeting stringent automotive standards and safety requirements. This device is designed for centralized or distributed architectures within xEV powertrains. The BQ79758B-Q1 battery monitor operates at a -40°C to 125°C ambient temperature range. The BQ79758B-Q1 devices are AEC-Q100 qualified for automotive applications. This battery monitor is ideal for Battery Management System (BMS) in hybrid and electric powertrain systems and energy storage battery packs with BMS.

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 temperature 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 ring architecture
  • Hardware reset by host simulates POR-like event without battery removal
  • On chip memory for one time custom programming
  • <6µA low power mode current
  • Compatible with BQ79600-Q1 with SPI/UART interface

Applications

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

System Design

Texas Instruments BQ79758B-Q1 Battery Monitor
Published: 2025-10-31 | Updated: 2025-12-10