BQ27425-G2A System-Side Impedance Track™ Fuel Gauge | Gas Gauge Battery |

BQ27425-G2A (ACTIVE)

System-Side Impedance Track™ Fuel Gauge | Gas Gauge Battery



The Texas Instruments bq27425-G2 fuel gauge is an easy-to-configure microcontroller peripheral that provides system-side fuel gauging for single-cell Li-Ion batteries. The device requires minimal user configuration and system microcontroller firmware development.

The fuel gauge uses the patented Impedance Track™ algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-of-charge (%), and battery voltage (mV).

Battery fuel gauging with the bq27425-G2 fuel gauge requires connections only to PACK+ (P+) and PACK– (P–) for a removable battery pack or embedded battery circuit. The 15-pin, 2.69 mm × 1.75 mm, 0.5-mm pitch chip scale package (DSBGA) is ideal for space-constrained applications.


  • Single-Series Cell Li-Ion Battery Fuel Gauge
    • Resides on System Board
    • Supports Embedded or Removable Batteries
    • Powered Directly From Battery With Integrated
    • Low-Value Integrated Sense Resistor
      (10 mΩ, Typical)
  • Easy-to-Configure Fuel Gauging Based on
    Patented Impedance Track Technology
    • Reports Remaining Capacity and State of
      Charge (SOC) With Smoothing Filter
    • Automatically Adjusts for Battery Aging, Self-
      Discharge, Temperature, and Rate Changes
    • Battery State-of-Health (Aging) Estimation
  • Microcontroller Peripheral Supports:
    • 400-kHz I2C Serial Interface
    • Configurable SOC Interrupt or
      Battery Low Digital Output Warning
    • Internal Temperature Sensor or
      Host-Reported Temperature

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Parametrics Compare all products in Battery fuel gauges

Number of series cells
Cell chemistry
Battery capacity (Max) (mAh)
Communication interface
Battery capacity (Min) (mAh)
External capacity indication
Gas gauge algorithm
Cell balancing
Operating temperature range (C)
Package Group
Package size: mm2:W x L (PKG)
BQ27425-G2A BQ27421-G1 BQ27425-G2B
Single Cell     Single Cell     Single Cell    
Li-Ion/Li-Polymer     Li-Ion/Li-Polymer     Li-Ion/Li-Polymer    
4000     8000     4000    
I2C     I2C     I2C    
100     100     100    
None     None     None    
System     System     System    
Impedance Track     Impedance Track     Impedance Track    
Integrated Sense Resistor    
-40 to 85     -40 to 85     -40 to 85    
DSBGA | 15     DSBGA | 9     DSBGA | 15    
See datasheet (DSBGA)     See datasheet (DSBGA)     See datasheet (DSBGA)