Product details

Cell chemistry Li-Ion/Li-Polymer Number of series cells Single Cell Communication interface I2C Battery capacity (Min) (mAh) 300 Battery capacity (Max) (mAh) 8000 Implementation System External capacity indication None Features Impedance Track™ algorithm Operating temperature range (C) -40 to 85 Cell balancing
Cell chemistry Li-Ion/Li-Polymer Number of series cells Single Cell Communication interface I2C Battery capacity (Min) (mAh) 300 Battery capacity (Max) (mAh) 8000 Implementation System External capacity indication None Features Impedance Track™ algorithm Operating temperature range (C) -40 to 85 Cell balancing
VSON (DRZ) 12 10 mm² 4 x 2.5
  • Battery Fuel Gauge for 1-Series Li-Ion Applications
  • Resides on System Main Board
    • Works With Embedded or Removable Battery Packs
  • Works With Battery ID Resistor in Battery Pack
  • Microcontroller Peripheral Provides:
    • Accurate Battery Fuel Gauging
    • Internal Temperature Sensor for System Temperature Reporting
    • Battery Low Interrupt Warning
    • Battery Insertion Indicator
    • Battery ID Detection
    • 96 Bytes of Non-Volatile Scratch-Pad FLASH
  • Battery Fuel Gauge Based on Patented Impedance Track™ Technology
    • Models the Battery Discharge Curve for Accurate Time-to-Empty Predictions
    • Automatically Adjusts for Battery Aging, Battery Self-Discharge, and Temperature/Rate Inefficiencies
    • Low-Value Sense Resistor (10㪘 or Less)
  • I2C™ Interface for Connection to System Microcontroller Port
  • 12-Pin 2,5-mm x 4-mm SON Package
  • applications
    • Smartphones
    • PDAs
    • Digital Still and Video Cameras
    • Handheld Terminals
    • MP3 or Multimedia Players

Impedance Track, bqEASY are trademarks of Texas Instruments.
I2C is a trademark of Philips Electronics.

  • Battery Fuel Gauge for 1-Series Li-Ion Applications
  • Resides on System Main Board
    • Works With Embedded or Removable Battery Packs
  • Works With Battery ID Resistor in Battery Pack
  • Microcontroller Peripheral Provides:
    • Accurate Battery Fuel Gauging
    • Internal Temperature Sensor for System Temperature Reporting
    • Battery Low Interrupt Warning
    • Battery Insertion Indicator
    • Battery ID Detection
    • 96 Bytes of Non-Volatile Scratch-Pad FLASH
  • Battery Fuel Gauge Based on Patented Impedance Track™ Technology
    • Models the Battery Discharge Curve for Accurate Time-to-Empty Predictions
    • Automatically Adjusts for Battery Aging, Battery Self-Discharge, and Temperature/Rate Inefficiencies
    • Low-Value Sense Resistor (10㪘 or Less)
  • I2C™ Interface for Connection to System Microcontroller Port
  • 12-Pin 2,5-mm x 4-mm SON Package
  • applications
    • Smartphones
    • PDAs
    • Digital Still and Video Cameras
    • Handheld Terminals
    • MP3 or Multimedia Players

Impedance Track, bqEASY are trademarks of Texas Instruments.
I2C is a trademark of Philips Electronics.

The Texas Instruments bq27501 system-side 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. The bq27501 resides on the system main board, and manages an embedded battery (non-removable) or a removable battery pack.

The device uses the patented Impedance Track™ algoritm for fuel gauging, and provides information such as remaiing battery capacity (mAh), state-of-charge (%), run-time to empty (min.), battery voltage (mV), and temperature (°C).

The device works with identification resistors in battery packs to gauge batteries of different fundamental chemistries and/or different rated capacities.

The Texas Instruments bq27501 system-side 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. The bq27501 resides on the system main board, and manages an embedded battery (non-removable) or a removable battery pack.

The device uses the patented Impedance Track™ algoritm for fuel gauging, and provides information such as remaiing battery capacity (mAh), state-of-charge (%), run-time to empty (min.), battery voltage (mV), and temperature (°C).

The device works with identification resistors in battery packs to gauge batteries of different fundamental chemistries and/or different rated capacities.

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Technical documentation

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Type Title Date
* Data sheet System-Side Impedance-Track Fuel Gauge datasheet (Rev. A) 05 Jun 2009
Application note Going to Production With the bq275xx (Rev. F) 09 Oct 2014
Application note Using I2C Communication With the bq275xx Series of Fuel Gauges (Rev. B) 15 May 2014
User guide bq2750xEVM System Side Single-Cell Impedance Track™ (Rev. A) 04 Oct 2013
Application note Going to Production With the bq275xx (Rev. E) 20 Jan 2012
Application note Thermistor Selection Guide for Texas Instruments Advanced Fuel Gauges 28 Sep 2011
Application note How to Do Calibration and Create Golden DFI for Host Side Gas Gauge 01 Sep 2011
Application note WinCE/Linux Drivers for bq275xx Fuel Gauge 17 Mar 2011
Application note Updating bq275xx Firmware at Production (Rev. A) 21 Feb 2011
Application note How to Generate Golden Image for Single-Cell Impedance Track(TM) Devices 07 Jan 2010
Analog design journal Improving Battery Safety, Charging, and Fuel Gauging in Portable Media Apps 11 Mar 2009
Application note bqEASY for Configuring Single Cell Gas Gauge bq27501 23 Jan 2009
Application note Single Cell Gas Gauge Application Book 28 Jul 2008
Application note Updating Firmware with the bq2750x and EVM. (Rev. A) 22 Jul 2008
Application note Impedance Track Fuel Gauge Accuracy Test for GSM Phone Applications 21 Mar 2008
Application note Single Cell Gas Gauge Circuit Design 22 Feb 2008
Application note Single Cell Impedance Track Printed-Circuit Board Layout 22 Feb 2008
Application note Theory and Implementation of Impedance Track Battery Fuel-Gauging Algorithm 31 Jan 2008
Application note Quick Start Guide for bq2750x Family Gas Gauge 23 Jan 2008
Application note Key Design Considerations for the bq27500 and bq27501 30 Oct 2007
Analog design journal Host-Side Gas-Gauge-System Design Considerations for Single-Cell Handheld Apps 12 Oct 2007
White paper Impedance Track Based Fuel Gauging 27 Sep 2007

Design & development

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

Support software

bq27501 Senc File v1.23

SLUC151.ZIP (47 KB)
Support software

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

SLUC261HY.ZIP (496964 KB)
Support software

bqEVSW installer for all bq275xx devices (Rev. C)

SLUC367C.ZIP (63861 KB)
Simulation model

BQ275xx IBIS Model

SLUC119.ZIP (14 KB) - IBIS Model
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
SON (DRZ) 12 View options

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  • Ongoing reliability monitoring

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