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BQ79718B-Q1

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Automotive, 18-S precise battery monitor, balancer and integrated protector with ASIL-D compliance

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Data sheet

BQ79718B-Q1

ACTIVE
Data sheet Order now

Product details

Rating Automotive Number of series cells (max) 18 Number of series cells (min) 9 Features Cell balancing, High precision, I2C support, Integrated ADC, Multi-cell support, Open-wire detection, Overtemperature protection, Overvoltage protection, Separate MCU requirement, Stackable (built-in interface), Temperature sensing, Undertemperature protection, Undervoltage protection Vin (max) (V) 90 Communication interface Daisy Chain, Daisy chain, I2C controller, SPI controller, UART Operating temperature range (°C) to Battery overvoltage protection (min) (V) 2.7 Battery overvoltage protection (max) (V) 5.1 TI functional safety category Functional Safety-Compliant
Rating Automotive Number of series cells (max) 18 Number of series cells (min) 9 Features Cell balancing, High precision, I2C support, Integrated ADC, Multi-cell support, Open-wire detection, Overtemperature protection, Overvoltage protection, Separate MCU requirement, Stackable (built-in interface), Temperature sensing, Undertemperature protection, Undervoltage protection Vin (max) (V) 90 Communication interface Daisy Chain, Daisy chain, I2C controller, SPI controller, UART Operating temperature range (°C) to Battery overvoltage protection (min) (V) 2.7 Battery overvoltage protection (max) (V) 5.1 TI functional safety category Functional Safety-Compliant
HTQFP (PAP) 64 144 mm² 12 x 12
  • AEC-Q100 qualified with the following results:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature range
    • Device HBM ESD classification level 2
    • Device CDM ESD classification level C1
  • 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
  • Cell voltage and battery pack current measurement synchronized to 64µs
  • Support limp home mode with full redundancy
  • Integrated post-ADC configurable digital low-pass filters
  • Supports busbar without affecting measurement accuracy
  • 12 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 Ring Architecture
  • Hardware reset by host simulates POR-like event without battery removal
  • Support transformer and capacitive isolation
  • On chip memory for one time custom programming
  • Low power mode current <6µA
  • Compatible with BQ79600-Q1 with SPI/UART interface
  • AEC-Q100 qualified with the following results:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature range
    • Device HBM ESD classification level 2
    • Device CDM ESD classification level C1
  • 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
  • Cell voltage and battery pack current measurement synchronized to 64µs
  • Support limp home mode with full redundancy
  • Integrated post-ADC configurable digital low-pass filters
  • Supports busbar without affecting measurement accuracy
  • 12 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 Ring Architecture
  • Hardware reset by host simulates POR-like event without battery removal
  • Support transformer and capacitive isolation
  • On chip memory for one time custom programming
  • Low power mode current <6µA
  • Compatible with BQ79600-Q1 with SPI/UART interface

The BQ79718B-Q1 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 standard and safety requirements. The device is designed for centralized or distributed architectures in xEV powertrain with the daisy-chain isolated by transformer (or capacitor).

The BQ79718B-Q1 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 standard and safety requirements. The device is designed for centralized or distributed architectures in xEV powertrain with the daisy-chain isolated by transformer (or capacitor).
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* Data sheet BQ79718B-Q1 Functional Safety-Compliant Automotive 18S Battery Monitor datasheet PDF | HTML 12 Aug 2025

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Driver or library

BQ7971XB-Q1-DESIGN — BQ7971xB-Q1 Secure Resource folder

BQ7971xB-Q1 secure resources folder including datasheet, application notes, EVM userguides and other technical resources related to BQ7971xB-Q1
Supported products & hardware

Supported products & hardware

Products
Battery monitors & balancers
  • BQ79712SB-Q1 — Automotive 12-S battery monitor and balancer with integrated protector and LDO FET
  • BQ79716B-Q1 — 16-S automotive precision battery monitor, balancer and integrated protector with ASIL-D compliance
  • BQ79718B-Q1 — Automotive, 18-S precise battery monitor, balancer and integrated protector with ASIL-D compliance
  • BQ79758B-Q1 — Automotive, 18-S ASIL-D compliant precise battery monitor and balancer with current sense
Request
Driver or library

BQ7971XB-Q1-FS — Functional Safety documentation for BQ7971XB-Q1

This secure folder stores Functional Safety document for BQ7971XB-Q1
Supported products & hardware

Supported products & hardware

Products
Battery monitors & balancers
  • BQ79716B-Q1 — 16-S automotive precision battery monitor, balancer and integrated protector with ASIL-D compliance
  • BQ79718B-Q1 — Automotive, 18-S precise battery monitor, balancer and integrated protector with ASIL-D compliance
  • BQ79758B-Q1 — Automotive, 18-S ASIL-D compliant precise battery monitor and balancer with current sense
Request
Reference designs

TIDA-020076 — Automotive high-voltage BMS reference design: 18S wired or wireless cell supervisor unit

This reference design implements a cell supervision unit for up to 18 cells. The unit can be daisy-chained to cover typical high-voltage battery ranges used in passenger cars, commercial vehicles, and two- and three-wheelers operating at voltages higher than 72V. The reference design features both (...)
Design guide: PDF
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HTQFP (PAP) 64 Ultra Librarian
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