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BQ41Z90

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3 to 16 series Li-ion highly integrated battery fuel gauge, monitor and protector

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BQ41Z90

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Data sheet Order now

Product details

Cell chemistry Li-Ion/Li-Polymer, LiFePO4 Number of series cells 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, >4 Cells Communication interface I2C, SMBus Battery capacity (min) (mAh) 100 Battery capacity (max) (mAh) 65000 Implementation Pack Features Cell balancing, Dynamic Z-Track™ technology, ECC authentication, Integrated Protector, SHA-256 Authentication, Turbo Mode Operating temperature range (°C) -40 to 105 Cell balancing External, Internal Rating Catalog
Cell chemistry Li-Ion/Li-Polymer, LiFePO4 Number of series cells 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, >4 Cells Communication interface I2C, SMBus Battery capacity (min) (mAh) 100 Battery capacity (max) (mAh) 65000 Implementation Pack Features Cell balancing, Dynamic Z-Track™ technology, ECC authentication, Integrated Protector, SHA-256 Authentication, Turbo Mode Operating temperature range (°C) -40 to 105 Cell balancing External, Internal Rating Catalog
HTQFP (PVP) 64 81 mm² (9 mm × 9 mm)
  • Highly integrated battery pack manager for 3 to 16 cells in series applications
    • Ultra-low power 32-bit RISC processor
    • ADC measurements for up to 16 cells in series with 80V tolerance
    • High Accuracy SoC and SoH with Dynamic Z Track™ gauging algorithm
    • Certificate-based security protected flash memory
  • Precision analog front end with two independent ADCs:
    • High-accuracy 18-bit integrating delta-sigma coulomb counter
    • High-accuracy 16-bit delta-sigma with input translation and multiplexer
    • Support for simultaneous current and voltage sampling
    • Supports up to eight external thermistor measurements and an internal temperature sensor
  • Strong High-side NMOS FET drive with fast turn-on and turn-off time
  • Charge pump support for pre-charge and pre-discharge NMOS FET drivers
  • Parallel configuration support for removable battery with separate charger and system ports
  • Cell balancing support up to 50mA bypass per cell
  • Diagnostic lifetime data monitor and recorder
  • Multiple host communication support:
    • I2C (up to 1MHz )
    • SMBus 3.2 (up to 1MHz)
  • Multiple power modes for low quiescent current operation
  • SHA-1, SHA-2, or EC-KCDSA authentication for robust battery pack security
  • Highly integrated battery pack manager for 3 to 16 cells in series applications
    • Ultra-low power 32-bit RISC processor
    • ADC measurements for up to 16 cells in series with 80V tolerance
    • High Accuracy SoC and SoH with Dynamic Z Track™ gauging algorithm
    • Certificate-based security protected flash memory
  • Precision analog front end with two independent ADCs:
    • High-accuracy 18-bit integrating delta-sigma coulomb counter
    • High-accuracy 16-bit delta-sigma with input translation and multiplexer
    • Support for simultaneous current and voltage sampling
    • Supports up to eight external thermistor measurements and an internal temperature sensor
  • Strong High-side NMOS FET drive with fast turn-on and turn-off time
  • Charge pump support for pre-charge and pre-discharge NMOS FET drivers
  • Parallel configuration support for removable battery with separate charger and system ports
  • Cell balancing support up to 50mA bypass per cell
  • Diagnostic lifetime data monitor and recorder
  • Multiple host communication support:
    • I2C (up to 1MHz )
    • SMBus 3.2 (up to 1MHz)
  • Multiple power modes for low quiescent current operation
  • SHA-1, SHA-2, or EC-KCDSA authentication for robust battery pack security

The Texas Instruments BQ41Z90 is a fully integrated pack-based battery pack manager solution, that provides a flash programmable CPU, safety protection, and elliptical curve cryptography (ECC) authentication for 3 to 16 cells in series Li-ion, LiFeP4, NiMH, and Li-polymer battery packs.

The BQ41Z90 battery pack manager communicates through SMBus v3.2 or I2C-compatible interfaces, and combines an ultra-low-power, high-speed 32-bit processor, high-accuracy analog measurement capabilities, integrated flash memory, an array of peripheral IO, an NMOS protection FET drive, and a SHA-1, SHA-2, or EC-KCDSA authentication responder into a complete, high-performance battery management solution.

The Texas Instruments BQ41Z90 is a fully integrated pack-based battery pack manager solution, that provides a flash programmable CPU, safety protection, and elliptical curve cryptography (ECC) authentication for 3 to 16 cells in series Li-ion, LiFeP4, NiMH, and Li-polymer battery packs.

The BQ41Z90 battery pack manager communicates through SMBus v3.2 or I2C-compatible interfaces, and combines an ultra-low-power, high-speed 32-bit processor, high-accuracy analog measurement capabilities, integrated flash memory, an array of peripheral IO, an NMOS protection FET drive, and a SHA-1, SHA-2, or EC-KCDSA authentication responder into a complete, high-performance battery management solution.

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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet BQ41Z90 Highly Integrated 3–16 Cell Battery Fuel Gauge with IT-DZT Algorithm and ECC Authentication datasheet (Rev. A) PDF | HTML Dec 21, 2024
* User guide BQ41z90 Technical Reference Manual Sep 12, 2024
Application note Dynamic Z-Track™ Technology: An Advanced Battery Gauging Algorithm for Dynamic Load Applications (Rev. A) PDF | HTML Jul 15, 2025
Technical article Redefining battery accuracy: How the Dynamic Z-Track™ algorithm predicts unpredictable battery loads PDF | HTML Jun 28, 2025
Product overview Industry-First Fully Integrated 3-16S Battery Fuel Gauge, Monitor, and Protector, with Dynamic Z-Track PDF | HTML Mar 7, 2025
Application note How to Create and Program Authentication Keys into TI Battery Fuel Gauges PDF | HTML Mar 5, 2025

Design & development

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Evaluation board

BQ41Z90EVM — BQ41Z90 evaluation module

The BQ41Z90EVM is a complete system for evaluating the functionality of the BQ41Z90 fuel gauge. This gauge is appropriate for applications powered by multicell battery systems up to 16 cells in series. The evaluation module (EVM) includes one BQ41Z90 circuit module, a current-sense resistor and (...)
User guide: PDF | HTML
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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
Firmware

BQ41Z90-FW — BQ41Z90 device firmware

Supported products & hardware
GUI for evaluation module (EVM)

BQSTUDIO-GUI — Battery Management Studio (bqStudio) Software - Web Based Version

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
Package Pins CAD symbols, footprints & 3D models
HTQFP (PVP) 64 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

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