Product details

Cell chemistry Li-Ion/Li-Polymer, LiFePO4 Number of series cells 2-4 Cells, Single Cell Communication interface SMBus Battery capacity (min) (mAh) 100 Battery capacity (max) (mAh) 65000 Implementation Pack External capacity indication LED Features Cell balancing, Impedance Track™ algorithm, Integrated Protector, SHA-1 Authentication, Turbo Mode Operating temperature range (°C) -40 to 85 Cell balancing External, Internal Rating Catalog
Cell chemistry Li-Ion/Li-Polymer, LiFePO4 Number of series cells 2-4 Cells, Single Cell Communication interface SMBus Battery capacity (min) (mAh) 100 Battery capacity (max) (mAh) 65000 Implementation Pack External capacity indication LED Features Cell balancing, Impedance Track™ algorithm, Integrated Protector, SHA-1 Authentication, Turbo Mode Operating temperature range (°C) -40 to 85 Cell balancing External, Internal Rating Catalog
VQFN (RSM) 32 16 mm² 4 x 4
  • Fully integrated 1-series, 2-series, 3-series, and 4-series Li-ion or Li-polymer cell battery pack manager and protection
  • Next-generation patented Impedance Track™ technology accurately measures available charge in Li-ion and Li-polymer batteries
  • High-side N-CH protection FET drive
  • Integrated cell balancing while charging or at rest
  • Suitable for batteries between 100 mAh and 29 Ah
  • Full array of programmable protection features
    • Voltage
    • Current
    • Temperature
    • Charge timeout
    • CHG/DSG FETs
    • AFE
  • Sophisticated charge algorithms
    • JEITA
    • Enhanced charging
    • Adaptive charging
    • Cell balancing
  • Supports TURBO Mode 2.0
  • Supports battery trip point (BTP)
  • Diagnostic lifetime data monitor and black box recorder
  • LED display
  • Supports two-wire SMBus v1.1 interface
  • SHA-1 authentication
  • IATA support
  • Compact package: 32-lead QFN (RSM)
  • Fully integrated 1-series, 2-series, 3-series, and 4-series Li-ion or Li-polymer cell battery pack manager and protection
  • Next-generation patented Impedance Track™ technology accurately measures available charge in Li-ion and Li-polymer batteries
  • High-side N-CH protection FET drive
  • Integrated cell balancing while charging or at rest
  • Suitable for batteries between 100 mAh and 29 Ah
  • Full array of programmable protection features
    • Voltage
    • Current
    • Temperature
    • Charge timeout
    • CHG/DSG FETs
    • AFE
  • Sophisticated charge algorithms
    • JEITA
    • Enhanced charging
    • Adaptive charging
    • Cell balancing
  • Supports TURBO Mode 2.0
  • Supports battery trip point (BTP)
  • Diagnostic lifetime data monitor and black box recorder
  • LED display
  • Supports two-wire SMBus v1.1 interface
  • SHA-1 authentication
  • IATA support
  • Compact package: 32-lead QFN (RSM)

The BQ40Z50-R2 device, incorporating patented Impedance Track™ technology, is a fully integrated, single-chip, pack-based solution that provides a rich array of features for gas gauging, protection, and authentication for 1-series, 2-series, 3-series, and 4-series cell Li-ion and Li-polymer battery packs.

Using its integrated high-performance analog peripherals, the BQ40Z50-R2 device measures and maintains an accurate record of available capacity, voltage, current, temperature, and other critical parameters in Li-ion or Li-polymer batteries, and reports this information to the system host controller over an SMBus v1.1 compatible interface.

The BQ40Z50-R2 device, incorporating patented Impedance Track™ technology, is a fully integrated, single-chip, pack-based solution that provides a rich array of features for gas gauging, protection, and authentication for 1-series, 2-series, 3-series, and 4-series cell Li-ion and Li-polymer battery packs.

Using its integrated high-performance analog peripherals, the BQ40Z50-R2 device measures and maintains an accurate record of available capacity, voltage, current, temperature, and other critical parameters in Li-ion or Li-polymer batteries, and reports this information to the system host controller over an SMBus v1.1 compatible interface.

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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet BQ40Z50-R2 1-Series, 2-Series, 3-Series, and 4-Series Li-Ion Battery Pack Manager datasheet (Rev. C) PDF | HTML 16 Apr 2021
* User guide BQ40Z50-R2 Technical Reference Manual (Rev. B) 12 Oct 2018
Application note How to Create and Program Authentication Keys into TI Battery Fuel Gauges PDF | HTML 05 Mar 2025
EVM User's guide bq40z50EVM Li-Ion Battery Pack Manager Evaluation Module (Rev. C) PDF | HTML 04 Nov 2022
Application note Autonomous Smart Battery Guide PDF | HTML 15 Oct 2021
User guide BQ40Z50-R4 Technical Reference Manual PDF | HTML 31 Mar 2021
Application note Start Guide for BQ Products 05 Oct 2020
Application note Advanced Charge Algorithm Application Note 02 Aug 2018
Application note Achieving The Successful Learning Cycle 19 Jun 2018
Application note Simple Guide to Chemical ID Selection Tool (GPC) (Rev. A) 05 Jun 2018
Application note bq40z50-R2 v2.08 to v2.11 Change List (Rev. A) 24 Apr 2018
User guide bq40z50-R2 v2.08 Required Changes 11 Oct 2017
Application note bq40z50-R1 to bq40z50-R2 Change List 13 Jul 2017
Application note Gauge Communication 12 Jan 2017
Application note SMBus Made Simple PDF | HTML 09 Nov 2016
Application note bq40z50 Data Memory Programming for Mass Production 01 Apr 2015
Application note bq40zxx Manufacture, Production, and Calibration (Rev. A) 23 Mar 2015
Application note bq40z50 Advanced Gas Gauge Circuit Design (Rev. A) 23 Sep 2014
Application note Theory and Implementation of Impedance Track Battery Fuel-Gauging Algorithm (Rev. A) PDF | HTML 16 May 2014

Design & development

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

Evaluation board

BQ40Z50EVM-561 — BQ40Z50 evaluation board 

BQ40z50EVM is a complete system useful for evaluating the functionality of the bq40z50 fuel gauge. As described on the BQ40z50 product folder, this gauge is appropriate for applications powered by multi-cell battery systems. The EVM includes one bq40z50 circuit module, a current sense resistor, and (...)

User guide: PDF | HTML
Not available on TI.com
Application software & framework

BQSTUDIO-STABLE Battery Management Studio (bqStudio) Software – stable version downloads for bq series of TI battery fuel gauges

Battery Management Studio (bqStudio) offers a full suite of robust tools to assist with the process of evaluating, designing with, configuring, testing, or otherwise utilizing TI Battery management products. This includes features that provide full access to registers and data memory including (...)

Supported products & hardware

Supported products & hardware

Download options
Application software & framework

BQSTUDIO-TEST Battery Management Studio (bqStudio) Software – Beta version downloads

Battery Management Studio (bqStudio) offers a full suite of robust tools to assist with the process of evaluating, designing with, configuring, testing, or otherwise utilizing TI Battery management products. This includes features that provide full access to registers and data memory including (...)

Supported products & hardware

Supported products & hardware

Download options
Application software & framework

GPCCHEM — Gauging Parameter Calculator: Match chemistry for Impedance Track gauges

GPC Chemistry ID matching for Impedance Track (IT) algorithm gas gauges (Find closest chemistry match) must be done before Optimizing room temperature or low temperature performance.

Gauging Parameter Calculator Chemistry ID matching for Impedance track gas gauges (GPCCHEM) is a math calculation (...)

Firmware

BQ40Z50-DEVICE-FW Firmware for bq40z50 family of gauges

BQ40Z50 family of gauges firmware is a firmware-only release that can be flashed onto any existing BQ40Z50 hardware (such as the BQ40Z50, BQ40Z50-R1, BQ40Z50-R2, … devices). The firmware incorporates the patented Impedance Track™ technology to create a pack-based solution that provides a rich (...)
Supported products & hardware

Supported products & hardware

Download options
Software programming tool

BQ-BMS-PROGRAMMER-SW Command line programmers for BQ products

BQ-BATTERY-PROGRAMMER-SW software development kit (SDK) is a collection of robust software command line tools that assist with the process of programming, testing, or assembling packs that use TI Battery management products. The executables in this software work with the MKST-3P-ALT-EV2300 MKS (...)

Supported products & hardware

Supported products & hardware

Download options
Software programming tool

BQ-PRODUCTION-SW Production software for 4th generation multicell battery fuel (gas) gauges

bqProduction offers a full suite of robust tools to assist with the process of configuring, calibrating, manufacturing and tracking printed circuit boards utilizing TI Battery Battery management products. This includes features that allow writing a golden image followed by different types of (...)

Supported products & hardware

Supported products & hardware

Download options
Reference designs

TIDA-00883 — 1 to 4 Series Cell Li-Ion Battery Pack Manager Reference Design

The Texas Instruments bq40z50-R1 device is a Battery Pack Manager that integrates gas gauging, and protection for completely autonomous operation of 1-series to 4-series cell Li-Ion and Li-Polymer battery packs. The architecture enables communication between the fuel gauging processor and an (...)
Test report: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
VQFN (RSM) 32 Ultra Librarian

Ordering & quality

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  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

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Support & training

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