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
DSBGA (YZG) 12 0 mm² 2.47 x 1.996
  • Battery Fuel Gauge for 1-Series Li-Ion Applications
  • Resides on System Main Board
    • Works With Embedded or Removable Battery Packs
  • Microcontroller Peripheral Provides:
    • Accurate Battery Fuel Gauging
    • Internal Temperature Sensor for Battery Temperature Reporting
    • Battery Low Interrupt Warning
    • Battery Insertion Indicator
    • Configurable Level of State of Charge (SOC) Interrupts
    • State of Health Indicator
    • 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 m or Less)
  • 400-kHz I2C Interface for Connection to System Microcontroller Port
  • In a 12-Pin NanoFree (CSP) Packaging
  • APPLICATIONS
    • Smartphones and PDAs
    • Digital Still and Video Cameras
    • Handheld Terminals
    • MP3 or Multimedia Players
  • Battery Fuel Gauge for 1-Series Li-Ion Applications
  • Resides on System Main Board
    • Works With Embedded or Removable Battery Packs
  • Microcontroller Peripheral Provides:
    • Accurate Battery Fuel Gauging
    • Internal Temperature Sensor for Battery Temperature Reporting
    • Battery Low Interrupt Warning
    • Battery Insertion Indicator
    • Configurable Level of State of Charge (SOC) Interrupts
    • State of Health Indicator
    • 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 m or Less)
  • 400-kHz I2C Interface for Connection to System Microcontroller Port
  • In a 12-Pin NanoFree (CSP) Packaging
  • APPLICATIONS
    • Smartphones and PDAs
    • Digital Still and Video Cameras
    • Handheld Terminals
    • MP3 or Multimedia Players

The Texas Instruments bq27505-J4 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 micro-controller firmware development. The bq27505-J4 resides on the system’s main board and manages an embedded battery (nonremovable) or a removable battery pack.

The bq27505-J4 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 (min), battery voltage (mV), temperature (°C) and state of health(%).

Battery fuel gauging with the bq27505-J4 requires only PACK+ (P+), PACK– (P–), and Thermistor (T) connections to a removable battery pack or embedded battery circuit. The CSP option is a 12-ball package in the dimensions of 2.43mm × 1.96mm with 0.5mm lead pitch. It is ideal for space constrained applications.

The Texas Instruments bq27505-J4 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 micro-controller firmware development. The bq27505-J4 resides on the system’s main board and manages an embedded battery (nonremovable) or a removable battery pack.

The bq27505-J4 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 (min), battery voltage (mV), temperature (°C) and state of health(%).

Battery fuel gauging with the bq27505-J4 requires only PACK+ (P+), PACK– (P–), and Thermistor (T) connections to a removable battery pack or embedded battery circuit. The CSP option is a 12-ball package in the dimensions of 2.43mm × 1.96mm with 0.5mm lead pitch. It is ideal for space constrained applications.

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Technical documentation

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Type Title Date
* Data sheet System Side Impedance Track Fuel Gauge datasheet 09 Dec 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 bq27505EVM 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 bq27505-J4 to bq27505-J5 Change List 09 May 2011
Application note Configuring the bq275054-J4 Data Flash 12 Feb 2010
Application note bq27505-J3 to bq27505-J4 Change List 22 Jan 2010
Application note How to Generate Golden Image for Single-Cell Impedance Track(TM) Devices 07 Jan 2010
User guide bqEasy(TM) for bq27505 Impedance Track(TM) Devices 17 Aug 2009
Application note How to Use bq27505 in a Smart Phone System 08 Aug 2009
Application note Quick-Start Guide for bq27505 Family Gas Gauge 08 Aug 2009
Analog design journal Improving Battery Safety, Charging, and Fuel Gauging in Portable Media Apps 11 Mar 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
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

bq27505-J4 SENC file v2.24

SLUC169.ZIP (47 KB)
Support software

bq27505 Evaluation Software (Rev. B)

SLUC170B.ZIP (20748 KB)
Support software

bqEVSW installer for all bq275xx devices (Rev. C)

SLUC367C.ZIP (63861 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
DSBGA (YZG) 12 View options

Ordering & quality

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

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