Product details


Cell chemistry Li-Ion/Li-Polymer Number of series cells Single Cell Communication interface I2C Battery capacity (Min) (mAh) 100 Battery capacity (Max) (mAh) 14000 Implementation System External capacity indication None Features Impedance Track™ algorithm Operating temperature range (C) -40 to 85 Cell balancing open-in-new Find other Battery fuel gauges

Package | Pins | Size

DSBGA (YZF) 9 3 mm² 1.62 x 1.66 open-in-new Find other Battery fuel gauges


  • Single-cell li-ion battery fuel gauge
    • Resides on system board
    • Supports embedded or removable batteries
    • Powers directly from the battery with integrated LDO
    • Supports a low-value external sense resistor (10 mΩ)
  • Ultra low power consumption in NORMAL (50 µA) and SLEEP (9 µA) modes
  • Battery fuel gauging based on patented Impedance Track™ technology
    • Provides three selectable preprogrammed profiles for 4.2-V, 4.35-V, and 4.4-V cells
    • Reports remaining capacity and state-of-charge (SOC) with smoothing filter
    • Adjusts automatically for battery aging, self-discharge, temperature, and rate changes
    • Estimates battery state-of-health (aging)
  • Microcontroller peripheral interface supports:
    • 400-kHz I2C serial interface
    • Configurable SOC interrupt or
      battery low digital output warning
    • Internal temperature sensor or host reported temperature or external thermistor

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open-in-new Find other Battery fuel gauges


The Texas Instruments BQ27426 battery fuel gauge is a single-cell gauge that requires minimal user-configuration and system microcontroller firmware development, leading to quick system bring-up.

Three chemistry profiles are preprogrammed to enable minimum user-configuration, and to help manage customer inventory across projects with different battery chemistries. The BQ27426 battery fuel gauge has very low sleep power consumption leading to longer battery run time. Configurable interrupts help save system power and free up the host from continuous polling. Accurate temperature sensing is supported via an external thermistor.

The BQ27426 battery fuel gauge uses the patented Impedance Track™ algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-of-charge (%), and battery voltage (mV).

Battery fuel gauging with the BQ27426 fuel gauge requires connections only to PACK+ (P+) and PACK– (P–) for a removable battery pack or embedded battery circuit. The tiny, 9-ball, 1.62 mm x 1.58 mm, 0.5 mm pitch NanoFree™ chip scale package (DSBGA) is ideal for space-constrained applications.

open-in-new Find other Battery fuel gauges

Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 14
Type Title Date
* Datasheet BQ27426 System-Side Impedance Track™ Fuel Gauge datasheet (Rev. F) Aug. 08, 2019
* User guides bq27426 Technical Reference Manual Dec. 17, 2015
Application notes Impedance Track Gauge Configuration For Dynamic Loads (EPOS) Sep. 15, 2019
Technical articles Get smart: How intelligent battery gauges improve battery life in continuous glucose monitors Apr. 19, 2019
Application notes Benefits of Battery Gauges and Protectors in Medical Applications Jul. 02, 2018
Application notes Achieving The Successful Learning Cycle Jun. 19, 2018
Application notes bq27426 Gauging Design for Applications With 2 Serial Li-Ion Batteries Dec. 14, 2017
Application notes The bq27426 Performace Under Dynamic Battery Voltage for Portable Audio Applicat Oct. 09, 2017
User guides Quick-Start Guide for bq27426 Fuel Gauge Jul. 11, 2017
Technical articles Achieving higher-accuracy battery fuel-gauge performance in ultra-low-power systems May 09, 2017
Application notes Gauge Communication Jan. 12, 2017
Application notes Enhanced Resolution Gauging for Low Current Applications Using Scaling Oct. 26, 2016
Technical articles Configuring a battery fuel gauge by reading the label on the back of your battery Mar. 11, 2016
User guides bq27426EVM-738 EVM: Single-Cell Impedance Track Technology Nov. 20, 2015

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 BQ27426EVM-738 evaluation module is a complete evaluation system for the bq27426. The EVM includes one bq27426 circuit module with an external sense resistor. A separated orderable EV2400 PC interface board for gas gauge interface along with a PC USB cable, and Windows™-based PC software (...)

  • External sense and temperature sensor
  • Quick and easy setup
  • Low power mode for active fuel gauging
  • Small solution size is ideal for space-constraint applications
  • Flexible chemistry configuration

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 
Linux Driver for BQ27XXX
BQ27XXXSW-LINUX The Linux driver supports the BQ27x series of Battery Fuel Gauges. The Linux driver supports communication through the I2C/HDQ bus and interfaces with the power supply sub-system to monitor battery properties.


Linux Mainline Status

Available in Linux Main line: Yes
Available through N/A


Design tools & simulation

document-generic User guide

Reference designs

24-V AC Power Stage With Wide Vin Converter and Battery Gauge Reference Design for Smart Thermostat
TIDA-01395 — The TIDA-01395 TI Design provides a low BOM cost, high-efficiency power stage solution for smart thermostats, and other gateway building automation end quipment. This power stage takes a 24-V AC input and produces a 5-V and 3.3-V output rail, which can power additional point-of-load converters if (...)
document-generic Schematic document-generic User guide
Wireless IoT, Bluetooth® Low Energy, 4½ Digit, 100kHz True RMS Digital Multimeter
TIDA-01012 — Many products are now becoming connected through the Internet of Things (IoT), including test equipment such as digital multimeters (DMM).  Enabled by Texas Instruments’ SimpleLink™ ultra-low power wireless microcontroller (MCU) platform, the TIDA-01012 reference design demonstrates (...)
document-generic Schematic document-generic User guide
Enhanced Accuracy Battery Fuel Gauge Reference Design for Low Power Industrial IoT Field Metering
TIDA-01014 The Internet of Things (IoT) revolution is efficiently connecting applications and instruments, enabling battery powered, wide scale very low power sensor deployment.  New technologies, such as TI’s advanced sensor and low power connectivity devices, are enabling these instruments to be (...)
document-generic Schematic document-generic User guide
Portable Audio Amplifier with Auto Audio Control 1S1P BMS Reference Design
TIDA-01182 — High performance, 10Watt (5W per speaker) portable audio amplifier that includes everything you need to implement a BMS (Battery Management Solution) for a portable audio amplifier (including a Charger, Fuel (Gas) Gauge and Protection for a 1S1P 18650 2400mAh Lithium battery) for a Class D Audio (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
DSBGA (YZF) 9 View options

Ordering & quality

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