BQ20Z95 is not recommended for new designs.
This product continues to be in production to support existing customers. Please consider one of these alternatives:
Same functionality with different pin-out to the compared device.
BQ40Z50-R2 ACTIVE 1-4 series Li-ion battery pack manager supporting Turbo Mode 2.0 This product is a multi-cell gauge with newer hardware.

Product details

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  • Next Generation Patented Impedance Track Technology Accurately Measures
    Available Charge in Li-Ion and Li-Polymer Batteries
    • Better Than 1% Error Over Lifetime of the Battery
  • Supports the Smart Battery Specification
    SBS V1.1
  • Flexible Configuration for 2-Series to 4-Series Li-Ion and Li-Polymer
    Cells
  • Powerful 8-Bit RISC CPU With Ultra-Low Power Modes
  • Full Array of Programmable Protection Features
    • Voltage, Current, and Temperature
  • Supports SHA-1 Authentication
  • Complete Battery Protection and Gas Gauge Solution in One Package
  • Small 44-Pin TSSOP (DBT) Package
  • Next Generation Patented Impedance Track Technology Accurately Measures
    Available Charge in Li-Ion and Li-Polymer Batteries
    • Better Than 1% Error Over Lifetime of the Battery
  • Supports the Smart Battery Specification
    SBS V1.1
  • Flexible Configuration for 2-Series to 4-Series Li-Ion and Li-Polymer
    Cells
  • Powerful 8-Bit RISC CPU With Ultra-Low Power Modes
  • Full Array of Programmable Protection Features
    • Voltage, Current, and Temperature
  • Supports SHA-1 Authentication
  • Complete Battery Protection and Gas Gauge Solution in One Package
  • Small 44-Pin TSSOP (DBT) Package

The bq20z95 SBS-compliant gas gauge and protection IC is a single IC solution designed for battery-pack or in-system installation. The bq20z95 measures and maintains an accurate record of available charge in Li-Ion or Li-Polymer batteries using its integrated high-performance analog peripherals, monitors capacity change, battery impedance, open-circuit voltage, and other critical parameters of the battery pack as well and reports the information to the system host controller over a serial-communication bus. Together with the integrated analog front-end (AFE) short-circuit and overload protection, the bq20z95 maximizes functionality and safety while minimizing external component count, cost, and size in smart battery circuits.

The implemented Impedance Track™ gas gauging technology continuously analyzes the battery impedance, resulting in superior gas-gauging accuracy. This enables remaining capacity to be calculated with discharge rate, temperature, and cell aging all accounted for during each stage of every cycle with high accuracy.

The bq20z95 SBS-compliant gas gauge and protection IC is a single IC solution designed for battery-pack or in-system installation. The bq20z95 measures and maintains an accurate record of available charge in Li-Ion or Li-Polymer batteries using its integrated high-performance analog peripherals, monitors capacity change, battery impedance, open-circuit voltage, and other critical parameters of the battery pack as well and reports the information to the system host controller over a serial-communication bus. Together with the integrated analog front-end (AFE) short-circuit and overload protection, the bq20z95 maximizes functionality and safety while minimizing external component count, cost, and size in smart battery circuits.

The implemented Impedance Track™ gas gauging technology continuously analyzes the battery impedance, resulting in superior gas-gauging accuracy. This enables remaining capacity to be calculated with discharge rate, temperature, and cell aging all accounted for during each stage of every cycle with high accuracy.

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Technical documentation

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Type Title Date
* Data sheet SBS 1.1-Compliant Gas Gauge and Protection Enabled w/Impedance Track datasheet (Rev. C) 16 Oct 2013
* Errata Technical Reference (Rev. A) 06 Aug 2007
Application note Wide-Vin Battery-Charger Using SMBus MSP430 MCUs and bq Fuel Gauges (Rev. B) 12 Jul 2019
Application note SMBus Made Simple 09 Nov 2016
User guide bq20z95EVM-001 SBS 1.1 Impedance Track Technology (Rev. A) 04 Oct 2013
Application note Data Flash Programing and Calibrating the bq20zxx Family of Gas Gauges (Rev. E) 14 Sep 2013
Application note Thermistor Selection Guide for Texas Instruments Advanced Fuel Gauges 28 Sep 2011
Application note Production 2: Data Flash Programming/Calibrating the bq20z80 Gas Gauges (Rev. B) (Rev. B) 12 Jan 2010
Application note Design 4: Support of Multiple Li-Ion Chemistries w/Impedance Track(TM) Gas Gauge (Rev. R) 15 Oct 2009
Application note Data Flash Programming Using the EV Software. (Rev. A) 27 Jul 2009
Application note Information to Provide When Reporting Issues With TI Gauges 18 Jul 2008
Application note 2-Series-Cell Considerations for Advanced Fuel Gauges 09 May 2008
Application note bq20z70, bq20z75, bq20z90, and bq20z95 Voltage Current & Measurement Accuracy 18 Mar 2008
Application note bq20z75/95 Printed Circuit Board Layout Guide 20 Dec 2007
Application note Quick-Start Guide for bq20zxx Family Gas Gauges (Rev. A) 04 Sep 2007
Application note bq29330 External Short Circuit Protection 22 Aug 2007
Application note Differences Between the bq20z70/z75/z80/z90/z95 Impedance TrackTM Gas Gauges 03 Apr 2007
Application note bq20z70 and bq20z90 Application Book 13 Dec 2006
Application note Thermistor Coefficient Calculator for TI Advanced Fuel Gauges 04 Oct 2006

Design & development

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

Support software

bq20z95EVM - bqEV-Easy SW Setup (Rev. B)

SLUC108B.ZIP (9801 KB)
Support software

bq20z95 Chemistry Updater

SLUC123.ZIP (73 KB)
Support software

Gas Gauge Chemistry Updater Setup v7.82 (Rev. HY)

SLUC261HY.ZIP (496964 KB)
Design tool

GASGAUGECHEM-SW — Gas Gauge Chemistry Updater

The Chemistry Updater installer contains data used by the bq Evaluation/ bqEVSW / bqEASY tool for selecting the correct or closest chemical identification file for your battery pack.

The Battery Management Studio (bqStudio) chemistry update zip file contains data used by bqStudio for selecting the (...)
CAD/CAE symbol

Mathcad Chemistry Selection Tool (Rev. DJ)

SLUC138DJ.ZIP (6840 KB)
Package Pins Download
TSSOP (DBT) 44 View options

Ordering & quality

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  • Ongoing reliability monitoring

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