Product details


Cell chemistry Li-Ion/Li-Polymer, LiFePO4 Number of series cells 2-4 Cells, >4 Cells Communication interface SMBus Battery capacity (Min) (mAh) 500 Battery capacity (Max) (mAh) 29000 Implementation Pack External capacity indication LED Features Cell Balancing, ECC authentication, Impedance Track™ algorithm, Integrated Protector, SHA-1 Authentication, Turbo Mode Operating temperature range (C) -40 to 85 Cell balancing External, Internal open-in-new Find other Battery fuel gauges

Package | Pins | Size

VQFN (RSM) 32 16 mm² 4 x 4 open-in-new Find other Battery fuel gauges


  • Fully integrated 2-series to 6-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
  • Configurable multifunction pins to support a variety of applications
  • Supports either Elliptic Curve Cryptography (ECC) or SHA-1 authentication
  • High-side N-CH protection FET drive
  • Integrated cell balancing while charging or at rest
  • Supports 29-Ah batteries natively, and larger capacities with scaling
  • 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/Intel Dynamic Battery Power Technology (DBPTv2)
  • Diagnostic Lifetime Data Monitor and Black Box Recorder
  • LED display
  • Supports two-wire SMBus v1.1 interface
  • IATA support
  • Compact package: 32-lead QFN (RSM)
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The BQ40Z80 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 2-series up to 6-series cell li-ion and li-polymer battery packs.

Using its integrated high-performance analog peripherals, the BQ40Z80 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.

Elliptic Curve Cryptography (ECC) or SHA-1 authentication with secure memory for authentication keys enables identification of genuine battery packs.

The BQ40Z80 device supports TURBO Mode 2.0/Intel Dynamic Battery Power Technology (DBPTv2) by providing the available max power and max current to the host system. The device has eight multifunction pins that can be configured as thermal inputs, ADC inputs, general purpose input/output (GPIO) pins, a presence pin, LED functions, display button input, or other functions. Status and flag registers are mappable to the GPIOs and used as interrupts to the host processor.

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More information

Please use this device as a 2S to 6S battery pack manager.

Technical documentation

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Type Title Date
* Data sheet BQ40Z80 2-Series to 6-Series Li-Ion Battery Pack Manager datasheet (Rev. B) Sep. 14, 2020
User guide BQ40Z80 Technical Reference Manual (Rev. C) Jun. 16, 2021
Technical article Searching for the newest innovations in power? Find them at APEC Feb. 09, 2019
User guide bq40z80EVM Li-Ion Battery Pack Manager Rev B Board User's Guide Nov. 01, 2018
User guide TI Fuel Gauge Authentication Key Packager and Programmer Tools Jun. 29, 2018
Application note How to Complete a Successful Learning Cycle for the bq40z80 Jun. 06, 2018
Application note bq40z80 Manufacture, Production, and Calibration Jun. 06, 2018
Application note Simple Guide to Chemical ID Selection Tool (GPC) (Rev. A) Jun. 05, 2018
Application note Gauge Communication Jan. 12, 2017

Design & development

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

Hardware development

document-generic User guide
The bq40z80 EVM includes one bq40z80, two bq771807 secondary protectors, and a link to Microsoft Windows based PC software, which can be used to monitor and predict capacity, perform cell balancing, monitor critical parameters, protect the cells from overcharge, over-discharge, short circuit, and (...)
  • 2s-7s battery gauging with protection
  • Supports internal and external cell balancing
  • Multiple GPIOs and LED support
  • Protection features include:
    • Oover and under voltage
    • Short circuit in charge and discharge
    • Charge and pre-charge timeout
    • Over and under temperaure

Software development

Battery Management Studio (bqStudio) Software
BQSTUDIO 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 (...)
  • Real-time Gauge Dashboard for monitoring basic registers
  • Full register access and logging
  • Full data memory access and logging
  • Product configuration and monitoring tools
  • Import and export of product configurations
  • Calibration and test automation
  • Export of FS files for the target production environment 
SLUC665.ZIP (135883 KB)
SLUC666.ZIP (140691 KB)
Program Key Software for Battery Fuel Gauges
BQKEYPROGRAMMER Several TI Fuel Gauge products support authentication for anti-counterfeit protection of battery packs. The selection of the battery authentication scheme between SHA and ECC is left to the user to decide. bqKeyPackager is provided to package the key, and bqKeyProgrammer is provided to program the (...)
  • Supports multiple TI gauge devices that support authentication
  • Supports SHA1, SHA256, and ECC key packaging depending on the device
  • Keeps key hidden from packmaker for additional security in the manufacturing process
SLUC672.ZIP (4255 KB)

CAD/CAE symbols

Package Pins Download
VQFN (RSM) 32 View options

Ordering & quality

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

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Support & training

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