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BQ27426
  • BQ27426
  • BQ27426

BQ27426

ACTIVE

Single cell System-side battery fuel (gas) gauge w/Pre-programmed chemistry Profile Linux Mainline Status

Texas Instruments BQ27426 Product Info

1 April 2026 0

Parameters

Cell chemistry

Li-Ion/Li-Polymer

Number of series cells

Single Cell

Communication interface

I2C

Battery capacity (min) (mAh)

100

Battery capacity (max) (mAh)

8000

Implementation

System

External capacity indication

None

Features

Impedance Track™ algorithm

Operating temperature range (°C)

-40 to 85

Rating

Catalog

Package

DSBGA (YZF)-9-3.0625 mm² 1.75 x 1.75

Features

  • 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 9 µA operating current when the load is below 10 mA, set by Sleep Current threshold.
  • Battery fuel gauging based on patented Impedance Track™ technology
    • Provides three selectable preprogrammed 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 I 2C serial interface
    • Configurable SOC interrupt or battery low digital output warning
    • Internal temperature sensor or host reported temperature or external thermistor
  • 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 9 µA operating current when the load is below 10 mA, set by Sleep Current threshold.
  • Battery fuel gauging based on patented Impedance Track™ technology
    • Provides three selectable preprogrammed 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 I 2C serial interface
    • Configurable SOC interrupt or battery low digital output warning
    • Internal temperature sensor or host reported temperature or external thermistor

Description

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 preprogrammed 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 × 1.58 mm, 0.5 mm pitch NanoFree™ chip scale package (DSBGA) is ideal for space-constrained applications.

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 preprogrammed 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 × 1.58 mm, 0.5 mm pitch NanoFree™ chip scale package (DSBGA) is ideal for space-constrained applications.

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