BQ27426 (ACTIVE)

Single cell System-Side Battery Fuel (Gas) Gauge w/Pre-programmed Chemistry Profile

Single cell System-Side Battery Fuel (Gas) Gauge w/Pre-programmed Chemistry Profile - BQ27426


The Texas Instruments bq27426 battery fuel gauge is a single-cell gauge that requires minimal user-configuration and system microcontroller firmware development, leading to quick system bring-up.

Three chemistry profiles are pre-programmed to enable minimum user-configuration, and to help manage customer inventory across projects with different battery chemistries. The bq27426 battery fuel gauge has very low sleep power consumption leading to longer battery run time. Configurable interrupts help save system power and free up the host from continuous polling. Accurate temperature sensing is supported via an external thermistor.

The bq27426 battery 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 bq27426 fuel gauge requires connections only to PACK+ (P+) and PACK– (P–) for a removable battery pack or embedded battery circuit. The tiny, 9-ball, 1.62 mm x 1.58 mm, 0.5 mm pitch NanoFree™ chip scale package (DSBGA) is ideal for space-constrained applications.


  • Single-Cell Li-Ion Battery Fuel Gauge
    • Resides on System Board
    • Supports Embedded or Removable Batteries
    • Powers Directly from the Battery with Integrated LDO
    • Supports a Low-Value External Sense Resistor (10 mΩ)
  • Ultra Low Power Consumption in NORMAL (50 µA) and SLEEP (9 µA) Modes
  • Battery Fuel Gauging Based on Patented Impedance Track™ Technology
    • Provides Three Selectable Pre-Programmed Profiles for 4.2-V, 4.35-V, and 4.4-V Cells
    • Reports Remaining Capacity and State-of-Charge (SOC) with Smoothing Filter
    • Adjusts Automatically for Battery Aging, Self-Discharge, Temperature, and Rate Changes
    • Estimates Battery State-of-Health (Aging)
  • Microcontroller Peripheral Interface Supports:
    • 400-kHz I2C™ Serial Interface
    • Configurable SOC Interrupt or
      Battery Low Digital Output Warning
    • Internal Temperature Sensor OR Host Reported Temperature OR External Thermistor

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Parametrics Compare all products in Battery Fuel Gauge

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)
BQ27426 BQ27220 BQ27520-G4 BQ27542-G1 BQ27621-G1 BQ35100
Single Cell    Single Cell    Single Cell    Single Cell    Single Cell    2-4 Cells
>4 Cells
Single Cell   
Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Li-Ion/Li-Polymer    Primary Lithium   
14000    29000    32000    32000    32000    32000   
I2C    I2C    I2C    HDQ
I2C    I2C   
100    100    100    100    100    100   
None    None    None    None    None    None   
System    Pack
System    Pack    System    Pack
Impedance Track    CEDV    Impedance Track    Impedance Track    Dynamic Voltage Correlation    Primary   
N/A    N/A    N/A    N/A    N/A    N/A   
N/A    N/A    N/A    SHA-1 Authentication    No Sense Resistor Required    End of Service   
-40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 85    -40 to 85   
9DSBGA    9DSBGA    15DSBGA    12SON    9DSBGA    14TSSOP