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BQ78706

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Industrial 14-s stackable battery monitor, balancer and integrated protector compliant to ASIL-B

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Data sheet

BQ78706

ACTIVE
Data sheet Order now

Product details

Rating Catalog Number of series cells (max) 14 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) 70 Communication interface Daisy Chain, Daisy chain, I2C controller, SPI controller, UART Operating temperature range (°C) -40 to 125 Battery overvoltage protection (min) (V) 2.7 Battery overvoltage protection (max) (V) 5.1 TI functional safety category Functional Safety-Compliant
Rating Catalog Number of series cells (max) 14 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) 70 Communication interface Daisy Chain, Daisy chain, I2C controller, SPI controller, UART Operating temperature range (°C) -40 to 125 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
  • Functional Safety-Compliant
    • Documentation to aid ISO 26262 system design
    • Systematic capability up to ASIL B
    • Hardware capability up to ASIL B
  • Measure 9 to 14 batteries in series per device, stackable up to 64 devices
  • Dedicated ADC with ±3.2mV accuracy over temperature
  • Cell voltage and battery pack current measurement synchronized to 64µs
  • Support limp 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
  • Functional Safety-Compliant
    • Documentation to aid ISO 26262 system design
    • Systematic capability up to ASIL B
    • Hardware capability up to ASIL B
  • Measure 9 to 14 batteries in series per device, stackable up to 64 devices
  • Dedicated ADC with ±3.2mV accuracy over temperature
  • Cell voltage and battery pack current measurement synchronized to 64µs
  • Support limp 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 BQ78706 provides high-accuracy cell voltage measurements for up to 14S battery modules in high-voltage battery management systems in energy storage systems (ESS) and portable power stations (PPS). This device has a state-of-the-art ADC architecture/measurement system meeting stringent safety requirements. With the daisy-chain isolated by transformer (or capacitor), the device is designed for centralized or distributed architectures in residential, commercial, or grid-scale energy storage systems.

The BQ78706 provides high-accuracy cell voltage measurements for up to 14S battery modules in high-voltage battery management systems in energy storage systems (ESS) and portable power stations (PPS). This device has a state-of-the-art ADC architecture/measurement system meeting stringent safety requirements. With the daisy-chain isolated by transformer (or capacitor), the device is designed for centralized or distributed architectures in residential, commercial, or grid-scale energy storage systems.
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Technical documentation

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Type Title Date
* Data sheet BQ78706 Functional Safety-Compliant 14S Battery Monitor datasheet PDF | HTML 16 Oct 2024
Application brief 高電壓 BMS 如何強化安全性與電池續航力 PDF | HTML 29 Apr 2025
Application brief 고전압 BMS로 안전성과 배터리 수명을 개선하는 원리 PDF | HTML 29 Apr 2025
Application brief How High-Voltage BMS Enhance Safety and Battery Lifetimes PDF | HTML 27 Mar 2025

Design & development

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

Driver or library

BQ78706PAPR-FS — Functional Safety Documentation for BQ78706PAPR battery monitor

Functional Safety Documentation for ASIL compliant battery monitor BQ78706PAPR
Supported products & hardware

Supported products & hardware

Products
Battery monitors & balancers
  • BQ78706 — Industrial 14-s stackable battery monitor, balancer and integrated protector compliant to ASIL-B
Request
Firmware

TIDA-HVBMS-ESS-PLTFRM-FW — Firmware files for TIDA-HVBMS-ESS-PLTFRM combo solution for High-Voltage Energy Storage Systems using BQ78706 battery monitor

Firmware files for TIDA-HVBMS-ESS-PLTFRM combo solution for High-Voltage Energy Storage Systems using BQ78706 battery monitor
Supported products & hardware

Supported products & hardware

Products
Battery monitors & balancers
  • BQ78706 — Industrial 14-s stackable battery monitor, balancer and integrated protector compliant to ASIL-B
Download
Design tool

BQ78706-DESIGN — Design folder

Contains datasheet and design information
Supported products & hardware

Supported products & hardware

Products
Battery monitors & balancers
  • BQ78706 — Industrial 14-s stackable battery monitor, balancer and integrated protector compliant to ASIL-B
Request
Reference designs

TIDA-010976 — 52s wireless battery management unit reference design for energy storage system

This reference design provides a 52s Wireless Battery Management Unit (wBMU) for energy storage systems with high cell-voltage accuracy. The wBMU passes voltage and temperature data from each cell to the host controller in real time, using wireless communication technology. The design overcomes (...)
Design guide: PDF
Reference designs

TIDA-010279 — Up to 1500V stackable battery management unit reference design for energy storage systems

This reference design is a full cell-temperature sensing and high cell-voltage accuracy Lithium-ion (Li-ion), lithium iron phosphate (LiFePO4) battery pack (52s). The design monitors each cell voltage, cell temperature, and protects the battery pack for safe use. This design supports both (...)
Design guide: PDF
Package Pins CAD symbols, footprints & 3D models
HTQFP (PAP) 64 Ultra Librarian
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