16-cell battery monitor with passive cell balancing



Product details


Number of series cells (Min) 6 Features Cell balancing Vin (Max) (V) 79.2 Number of series cells (Max) 16 Operating temperature range (C) -40 to 105 Rating Automotive open-in-new Find other Battery monitors & balancers

Package | Pins | Size

TQFP (PFC) 80 144 mm² 12 x 12 open-in-new Find other Battery monitors & balancers


  • Monitors and Balances 6-to-16 Cells per Device
  • Highly Accurate Monitoring
    • High Performance 14-bit Analog-to-Digital Converter (ADC) With Internal Reference
    • All Cells Converted in 2.4 ms (Nominal)
    • Eight AUX Inputs for Temperature and Other Sensors with Input Voltage of 0 V to 5 V
    • Internal Precision Reference
  • Integrated Protector With Separate Vref for Overvoltage (OV) and Undervoltage (UV) Comparators and Programmable VCELL Set Points
  • Engineered for High System Robustness
    • Up to 1-Mb/s Stackable Isolated Differential-UART
    • Up to 16 ICs in Daisy-Chain With Twisted Pair
    • Passes Bulk Current Injection (BCI) Test
    • Designed for Robust Hot-Plug Performance
  • Passive Balancing with External n-FETs and Active Balancing with EMB1428Q/EMB1499Q
  • Can Help Customers Meet Functional Safety Standard Requirements (For Example, ISO26262)
    • Built-in Self-Tests to Validate Defined Internal Functions
    • Support for Open Wire Detection
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 2: –40°C to 105°C Ambient Operating Temperature Range
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C3
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The bq76PL455A-Q1 device is an integrated 16-cell battery monitoring and protection device, designed for high-reliability automotive applications. The integrated high-speed, differential, capacitor-isolated communications interface allows up to sixteen bq76PL455A-Q1 devices to communicate with a host via a single high-speed Universal Asynchronous Receiver/Transmitter (UART) interface.

The bq76PL455A-Q1 monitors and detects several different fault conditions, including: overvoltage, undervoltage, overtemperature, and communication faults. Six GPIO ports as well as eight analog AUX ADC inputs are included for additional monitoring and programmable functionality. A secondary thermal shutdown is included for further protection.

The bq76PL455A-Q1 has features that customers may find useful to help them meet functional safety standard requirements. See Safety Manual for bq76PL455A-Q1 (SLUUB67).

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Technical documentation

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Type Title Date
* Datasheet bq76PL455A-Q1 16-Cell EV/HEV Integrated Battery Monitor and Protector datasheet (Rev. C) Nov. 03, 2016
Application note bq76PL455A-Q1 Design Recommendations (Rev. A) Oct. 04, 2018
User guide EM1402 Evaluation Module Feb. 01, 2017
Application note bq76PL455A-Q1 Use Case Scenarios Jan. 05, 2017
Technical articles How active and passive cell balancing works Oct. 05, 2016
Application note Designing EMI/EMC Safe Battery Pack Jun. 14, 2016
Technical articles How batteries may make travel on Mars easier Jan. 27, 2016
Technical articles From millivolts to miles: How the performance of battery-management ICs affects your car’s performance Dec. 10, 2015
Application note Getting Started with the bq76PL455A-Q1 Example Code Sep. 22, 2015
User guide bq76PL455EVM and GUI User's Guide (Rev. A) Jul. 28, 2015
Application note bq76PL455A-Q1 Software Design Reference (Rev. A) May 11, 2015

Design & development

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

Hardware development


The bq76PL455A-Q1 is a highly integrated automotive Li-ion battery management solution that measures the voltages of up to 16 cells connected in series as part of a larger battery stack and reports them via a high speed differential communications link. It provides passive cell balancing outputs (...)

  • 6 to 16 cell monitor and passive balance
  • High accuracy voltage sensing
  • 8 AUX inputs for temperature and other 0 to 5V sensors
  • Isolated daisy-chain communications with excellent EMC/EMI performance and BCI tolerance
  • Designed for robust hot-plug performance
16-Cell EV/HEV High Current Active Balance Solution, using the latest automotive battery management monitor and protector, the bq76PL455A-Q1. It provides high-performance battery management solution for large capacity battery packs, by combining the high integration and accuracy of the bq76PL455A-Q1 (...)
  • Highly accurate monitoring of 16 li-ion cells
  • Integrated protector
  • 3 - 5A active balance
  • Fully isolated transfer to external 12V supply/battery
  • 1-Mb/s stackable isolated differential-UART

Software development

SLUC270A.ZIP (4340 KB)
SLUC584A.ZIP (7551 KB)

Reference designs

High Performance MCU for an HEV/EV Battery Management System Reference Design
TIDM-TMS570BMS — A system example for an active cell balancing battery management system. The TMS570LS0432 microcontroller commands EMB1402 EVM to monitor the battery cells and perform charge/discharge from one battery cell to an external 12V supply. The user can view the cell status and control cell balancing from (...)
document-generic Schematic
Battery Pack Controller Communications Bridge Reference Design
TIDA-01400 — The Bridge BoosterPack demonstrates the bq76PL455A-Q1 configured as a dedicated communications bridge to translate MCU UART  communications to the bq76PL455A-Q1 daisy chain. The bq76PL455 Bridge BoosterPack also offers  an isolated current sense input for measuring battery pack current, as (...)
document-generic Schematic
16-Channel Active Cell Balance Reference Design
TIDA-00817 — 16-Cell EV/HEV High Current Active Balance Solution, using the latest automotive battery management monitor and protector, the bq76PL455A-Q1. It provides high-performance battery management solution for large capacity battery packs, by combining the high integration and accuracy of the bq76PL455A-Q1 (...)
document-generic Schematic

CAD/CAE symbols

Package Pins Download
TQFP (PFC) 80 View options

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