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 Operating temperature range (C) -40 to 85 open-in-new Find other Battery fuel gauges

Package | Pins | Size

DSBGA (YZG) 12 0 mm² 2.47 x 1.996 open-in-new Find other Battery fuel gauges


  • 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 mΩ or Less)
  • 400-kHz I2C™ Interface for Connection to System Microcontroller Port
  • In a 12-Pin NanoFree™ (CSP) Packaging
    • Smartphones and PDAs
    • Digital Still and Video Cameras
    • Handheld Terminals
    • MP3 or Multimedia Players

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

open-in-new Find other Battery fuel gauges


The Texas Instruments bq27505-J5 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-J5 resides on the system’s main board and manages an embedded battery (nonremovable) or a removable battery pack.

The bq27505-J5 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-J5 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.

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 15
Type Title Date
* Datasheet System Side Impedance Track Fuel Gauge - bq27505-J5 datasheet Sep. 30, 2010
Application note Achieving The Successful Learning Cycle Jun. 19, 2018
Application note Going to Production With the bq275xx (Rev. F) Oct. 09, 2014
Application note Using I2C Communication With the bq275xx Series of Fuel Gauges (Rev. B) May 15, 2014
Application note Going to Production With the bq275xx (Rev. E) Jan. 20, 2012
Application note bq27505-J4 to bq27505-J5 Change List May 09, 2011
Application note How to Generate Golden Image for Single-Cell Impedance Track(TM) Devices Jan. 07, 2010
Application note Quick-Start Guide for bq27505 Family Gas Gauge Aug. 08, 2009
Application note Single Cell Gas Gauge Application Book Jul. 28, 2008
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 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
White paper Impedance Track Based Fuel Gauging Sep. 27, 2007

Design & development

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

Software development

SLUC170B.ZIP (20748 KB)
SLUC255.ZIP (47 KB)
SLUC261HY.ZIP (496964 KB)
SLUC367C.ZIP (63861 KB)

Design tools & simulation

SLUC138DJ.ZIP (6840 KB)

CAD/CAE symbols

Package Pins Download
DSBGA (YZG) 12 View options

Ordering & quality

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