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) 32000 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) 15 5 mm² 2.65 x 1.996 open-in-new Find other Battery fuel gauges


  • Single-Series Cell Li-Ion Battery Fuel Gauge
    Resides on System Board
    • Integrated 2.5 VDC LDO
    • External Low-Value 10-mΩ Sense Resistor
  • Patented Impedance Track™ Technology
    • Adjusts for Battery Aging, Self-Discharge,
      Temperature, and Rate Changes
    • Reports Remaining Capacity, State-of-Charge
      (SOC), and Time-to-Empty
    • Optional Smoothing Filter
    • Battery State-of-Health (Aging) Estimation
    • Supports Embedded or Removable Packs with
      up to 32A hr Capacity
    • Accommodates Pack Swapping With 2
      Separate Battery Profiles
  • Microcontroller Peripheral Supports:
    • 400-kHz I2C Serial Interface
    • 32 Bytes of Scratch-Pad FLASH NVM
    • Battery Low Digital Output Warning
    • Configurable SOC Interrupts
    • External Thermistor, Internal Sensor, or Host-
      reported Temperature Options
  • Tiny 15-pin, 2610 × 1956 µm, 0.5-mm pitch
    NanoFree™ (DSBGA) Package
open-in-new Find other Battery fuel gauges


The Texas Instruments bq27520-G4 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 fuel gauge resides on the main board of the system and manages an embedded battery (non-removable) or a removable battery pack.

The fuel gauge 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 (minimum), battery voltage (mV), temperature (°C), and state of health (%).

Battery fuel gauging requires only PACK+ (P+), PACK– (P–), and optional Thermistor (T) connections to a removable battery pack or embedded battery circuit. The device uses a 15-ball NanoFree™ (DSBGA) package in the nominal dimensions of 2610 × 1956 µm with 0.5-mm lead pitch. It is ideal for space-constrained applications.

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Technical documentation

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Type Title Date
* Data sheet bq27520-G4 System-Side Impedance Track™ Fuel Gauge With Integrated LDO datasheet (Rev. B) Dec. 04, 2015
* User guide bq27520-G4 Technical Reference Manual Aug. 22, 2013
Application note Benefits of Battery Gauges and Protectors in Medical Applications Jul. 02, 2018
Application note Quick Start Guide for the BQ27520-G4 Jun. 18, 2018
Application note Simple Guide to Chemical ID Selection Tool (GPC) (Rev. A) Jun. 05, 2018
Application note Gauge Communication Jan. 12, 2017
Application note Enhanced Resolution Gauging for Low Current Applications Using Scaling Oct. 26, 2016
Application note Host System Calibration Method (Rev. B) May 19, 2016
Technical article Unboxing high end gas gauges Aug. 25, 2015
Technical article Where’s the gauge? Part 3 Feb. 11, 2015
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 Low-Power, Long Runtime Fuel Gauging Scheme Oct. 11, 2013
Application note bq27520-G3 to bq27520-G4 Change List Oct. 23, 2012
Application note Going to Production With the bq275xx (Rev. E) Jan. 20, 2012
Application note Thermistor Selection Guide for Texas Instruments Advanced Fuel Gauges Sep. 28, 2011
Application note How to Do Calibration and Create Golden DFI for Host Side Gas Gauge Sep. 01, 2011
Application note WinCE/Linux Drivers for bq275xx Fuel Gauge Mar. 17, 2011
Application note Updating bq275xx Firmware at Production (Rev. A) Feb. 21, 2011
Application note How to Generate Golden Image for Single-Cell Impedance Track(TM) Devices Jan. 07, 2010
Application note Improving Battery Safety, Charging, and Fuel Gauging in Portable Media Apps Mar. 11, 2009
Application note Single Cell Gas Gauge Application Book Jul. 28, 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
Application note Host-Side Gas-Gauge-System Design Considerations for Single-Cell Handheld Apps Oct. 12, 2007

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

This evaluation module (EVM) is a complete evaluation system for the bq27520. The EVM includes one bq27520 circuit module, a current sense resistor, and one thermistor. The circuit module includes one bq27520 integrated circuit and all other onboard components necessary to monitor and predict (...)

  • Complete evaluation system for the bq27520 gas gauge with Impedance Track™ technology
  • Populated circuit module for quick setup
  • Personal computer (PC) software and interface board for easy evaluation
  • Software that allows data logging for system analysis
  • Ability to upgrade to the latest firmware version (...)

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 
Gauging Parameter Calculator: Match chemistry for Impedance Track gauges
GPCCHEM GPC Chemistry ID matching for Impedance Track (IT) algorithm gas gauges (Find closest chemistry match) must be done before Optimizing room temperature or low temperature performance.

Gauging Parameter Calculator Chemistry ID matching for Impedance track gas gauges (GPCCHEM) is a math calculation and (...)

Gauging Parameter Calculator: Optimize room temperature performance for Impedance Track gauges
GPCRA0 Gauging Parameter Calculator – Optimize room temperature performance for Impedance track gas gauges (GPCRA0) / Golden GG Maker is a math calculation tool that helps the battery designer to refine the Impedance Track battery gauge parameters for a given battery profile. It provides optimized (...)
SLUC606.ZIP (4083 KB)
SLUC367C.ZIP (63861 KB)
SLUC411A.ZIP (4230 KB)
SLUC564FW.ZIP (2777 KB)

CAD/CAE symbols

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Ordering & quality

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  • MSL rating/Peak reflow
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  • Ongoing reliability monitoring

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