Product details


Cell chemistry Li-Ion/Li-Polymer Number of series cells Single Cell Communication interface HDQ, I2C Battery capacity (Min) (mAh) 500 Battery capacity (Max) (mAh) 16000 Implementation Pack External capacity indication None Features Impedance Track™ algorithm, Integrated Protector, SHA-1 Authentication Operating temperature range (C) -40 to 85 Cell balancing open-in-new Find other Battery fuel gauges

Package | Pins | Size

DSBGA (YZF) 15 5 mm² 2.816 x 1.996 open-in-new Find other Battery fuel gauges


  • Battery Fuel Gauge and Protector for 1-Series Li-
    Ion Applications
  • Microcontroller Peripheral Provides:
    • Accurate Battery Fuel Gauging Supports up to
      14,500 mAh
    • External and Internal Temperature Sensors for
      Battery Temperature Reporting
    • Precision 16-Bit High-Side Coulomb Counter
      with High-Side Low-Value Sense Resistor
      (5 mΩ to 20 mΩ)
    • Lifetime and Current Data Logging
    • 64 Bytes of Non-Volatile Scratch Pad Flash
    • SHA-1/HMAC Authentication
  • Battery Fuel Gauging Based on Patented
    Impedance Track7trade; Technology
    • Models Battery Discharge Curve for Accurate
      Time-To-Empty Predictions
    • Automatically Adjusts for Aging, Self-
      Discharge, and Temperature- and Rate-
      Induced Effects on Battery
  • Advanced Fuel Gauging Features
    • Internal Short Detection
    • Tab Disconnection Detection
  • Safety and Protection:
    • Over- and Undervoltage Protection with Low-
      Power Mode
    • Overcharging and Discharging Current
    • Overtemperature Protection
    • Short-Circuit Protection
    • Low-Voltage Notification
    • Voltage Doubler to Support High-Side
      N-Channel FET Protection
  • HDQ and I2C Interface Formats for
    Communication with Host System
  • Small 15-Ball NanoFree™ (BGA) Packaging
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The Texas Instruments bq27741-G1 Li-Ion battery fuel gauge is a microcontroller peripheral that provides fuel gauging for single-cell Li-Ion battery packs. The device requires little system microcontroller firmware development for accurate battery fuel gauging. The fuel gauge resides within the battery pack or on the system’s main board with an embedded battery (non-removable). The fuel gauge provides hardware-based over- and undervoltage, overcurrent in charge or discharge, and short-circuit protections.

The fuel gauge uses the patented Impedance Track™ algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-of-charge (%), run-time to empty (minimum), battery voltage (mV), and temperature (°C), as well as recording vital parameters throughout the lifetime of the battery.

The device comes in a 15-ball BGA package (2.776 mm × 1.96 mm) that is ideal for space-constrained applications.

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Technical documentation

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Type Title Date
* Data sheet bq27741-G1 Single-Cell Li-Ion Battery Fuel Gauge with Integrated Protection datasheet (Rev. C) Aug. 26, 2015
Application note Achieving The Successful Learning Cycle Jun. 19, 2018
Application note Host System Calibration Method (Rev. B) May 19, 2016
Application note Using I2C Communication With the bq275xx Series of Fuel Gauges (Rev. B) May 15, 2014
User guide bq27741EVM Single Cell Impedance Track™ Technology Evaluation Module May 10, 2013
User guide Pack-Side Impedance Track™ Battery Fuel Gauge With Integrated Protector and LDO Feb. 01, 2013
Application note bq27541-v200 to bq27541-G1 Change List (Rev. A) Oct. 21, 2012
Application note Configuring the bq2754x-G1 Data Flash Oct. 16, 2012
Application note Thermistor Selection Guide for Texas Instruments Advanced Fuel Gauges Sep. 28, 2011
Application note WinCE/Linux Drivers for bq275xx Fuel Gauge Mar. 17, 2011
Application note Going to Production With the bq2754x (Rev. A) Mar. 11, 2011
Application note How to Generate Golden Image for Single-Cell Impedance Track(TM) Devices Jan. 07, 2010
Application note Updating Firmware with the bq2750x and EVM. (Rev. A) Jul. 22, 2008
Application note Impedance Track Fuel Gauge Accuracy Test for GSM Phone Applications Mar. 21, 2008
Application note ESD and RF Mitigation in Handheld Battery Pack Electronics Mar. 06, 2008
Application note Single Cell Gas Gauge Circuit Design Feb. 22, 2008
Application note Single Cell Impedance Track Printed-Circuit Board Layout Feb. 22, 2008
Application note Theory and Implementation of Impedance Track Battery Fuel-Gauging Algorithm Jan. 31, 2008

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 BQ27741EVM along with GaugeStudio software provide the customer with tools for developing a battery fuel gauge module for placement inside a lithium-based battery pack. Customers are able to configure the BQ27741EVM so that it can provide accurate battery fuel gauging information. The integrated (...)
  • Complete evaluation system for the bq27741 gas gauge with Impedance Track™ Technology
  • Populated circuit module for quick setup
  • Downloadable software for testing and system analysis
  • Allows evaluation of all bq27741 integrated protector and gas gauging features

Software development

Gauging Parameter Calculator: Match chemistry for Impedance Track gauges
GPCCHEM 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 and (...)

Gauging Parameter Calculator: Optimize room temperature performance for Impedance Track gauges
GPCRA0 Gauging Parameter Calculator – Optimize room temperature performance for Impedance track gas gauges (GPCRA0) / Golden GG Maker is a math calculation tool that helps the battery designer to refine the Impedance Track battery gauge parameters for a given battery profile. It provides optimized (...)
SLUC606.ZIP (4083 KB)
SLUC499.ZIP (47 KB)
SLUC564FW.ZIP (2777 KB)

Reference designs

Pack-Side Impedance Track Fuel (Gas) Gauge Integrated Protector Reference Design
TIDA-00030 This reference design, using BQ27741 along with GaugeStudio software, provides the customer with tools for developing a battery fuel gauge module for placement inside a lithium-based battery pack. Customers are able to configure the solution so that it can provide accurate battery fuel gauging (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
DSBGA (YZF) 15 View options

Ordering & quality

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  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
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  • Qualification summary
  • Ongoing reliability monitoring

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