Product details


Cell chemistry Li-Ion/Li-Polymer Number of series cells Single Cell Communication interface I2C Implementation System Operating temperature range (C) -40 to 85 open-in-new Find other Battery fuel gauges

Package | Pins | Size

VSON (DRZ) 12 10 mm² 4 x 2.5 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
  • Two Varieties
    • bq27500: Uses PACK+, PACK–, and T Battery Terminals
    • bq27501: 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 m or Less)
  • I2C™ Interface for Connection to System Microcontroller Port
  • 12-Pin 2,5-mm × 4-mm SON Package
    • Smartphones
    • PDAs
    • Digital Still and Video Cameras
    • Handheld Terminals
    • MP3 or Multimedia Players

Impedance Track is a trademark of Texas Instruments.
I2C is a trademark of Philips Electronics.

open-in-new Find other Battery fuel gauges


The Texas Instruments bq27500/01 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 bq27500/01 resides on the system main board, and manages an embedded battery (non-removable) or a removable battery pack.

The bq27500/01 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), and temperature (°C).

Battery fuel gauging with the bq27500 requires only PACK+ (P+), PACK– (P–), and Thermistor (T) connections to a removable battery pack or embedded battery. The bq27501 works with identification resistors in battery packs to gauge batteries of different fundamental chemistries and/or significantly different rated capacities.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 27
Type Title Date
* Datasheet System-Side Impedance-Track Fuel Gauge datasheet (Rev. D) Apr. 25, 2008
Application notes Going to Production With the bq275xx (Rev. F) Oct. 09, 2014
Application notes Using I2C Communication With the bq275xx Series of Fuel Gauges (Rev. B) May 15, 2014
User guides bq2750xEVM System Side Single-Cell Impedance Track™ (Rev. A) Oct. 04, 2013
Application notes Going to Production With the bq275xx (Rev. E) Jan. 20, 2012
Application notes Thermistor Selection Guide for Texas Instruments Advanced Fuel Gauges Sep. 28, 2011
Application notes How to Do Calibration and Create Golden DFI for Host Side Gas Gauge Sep. 01, 2011
Application notes WinCE/Linux Drivers for bq275xx Fuel Gauge Mar. 17, 2011
Application notes Updating bq275xx Firmware at Production (Rev. A) Feb. 21, 2011
Application notes Multicell Li-Ion and Li-Polymer Battery Gas-Gauge Host Side Application (Rev. A) Jan. 25, 2011
Application notes How to Generate Golden Image for Single-Cell Impedance Track(TM) Devices Jan. 07, 2010
Application notes bq27500-V120 to bq27500-V130 Change List Dec. 03, 2009
Application notes Feature Set Comparison of bq27x00, bq27x10, bq27500, and bq27510 (Rev. A) Dec. 02, 2008
Application notes Single Cell Gas Gauge Application Book Jul. 28, 2008
Application notes Updating Firmware with the bq2750x and EVM. (Rev. A) Jul. 22, 2008
User guides bqEASY for Single Cell Impedance Track TM Devices (Rev. A) Apr. 04, 2008
Application notes Impedance Track Fuel Gauge Accuracy Test for GSM Phone Applications Mar. 21, 2008
Application notes Single Cell Gas Gauge Circuit Design Feb. 22, 2008
Application notes Single Cell Impedance Track Printed-Circuit Board Layout Feb. 22, 2008
Application notes Configuring the bq27500 Data Flash (Rev. A) Feb. 01, 2008
Application notes Theory and Implementation of Impedance Track Battery Fuel-Gauging Algorithm Jan. 31, 2008
Application notes Quick Start Guide for bq2750x Family Gas Gauge Jan. 23, 2008
User guides bq27500 EVM (HPA219 Rev. A) Errata Nov. 08, 2007
Application notes Key Design Considerations for the bq27500 and bq27501 Oct. 30, 2007
More literature Quick Start Guide for bq27500/1EVM Kit Oct. 24, 2007
Application notes Host-Side Gas-Gauge-System Design Considerations for Single-Cell Handheld Apps Oct. 12, 2007
White papers 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

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


SLUC261HY.ZIP (496964 KB)
SLUC367C.ZIP (63861 KB)

Design tools & simulation

SLUC119.ZIP (14 KB) - IBIS Model
SLUC138DJ.ZIP (6840 KB)

CAD/CAE symbols

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SON (DRZ) 12 View options

Ordering & quality

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