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

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

 

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

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 power consumption in NORMAL (50 µA) and SLEEP (9 µA) modes
  • 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 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

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Part number Order Number of series cells Cell chemistry Battery capacity (Max) (mAh) Communication interface Battery capacity (Min) (mAh) External capacity indication Implementation Gas gauge algorithm Cell balancing Features Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
BQ27426 Order now Single Cell     Li-Ion/Li-Polymer     14000     I2C     100     None     System     Impedance Track             -40 to 85     DSBGA | 9     9DSBGA: 3 mm2: 1.75 x 1.75 (DSBGA | 9)    
BQ27220 Order now Single Cell     Li-Ion/Li-Polymer     29000     I2C     100     None     Pack
System    
CEDV         CEDV     -40 to 85     DSBGA | 9     9DSBGA: 3 mm2: 1.75 x 1.75 (DSBGA | 9)    
BQ27520-G4 Order now Single Cell     Li-Ion/Li-Polymer     32000     I2C     100     None     System     Impedance Track             -40 to 85     DSBGA | 15     15DSBGA: 5 mm2: 2.75 x 1.75 (DSBGA | 15)    
BQ27621-G1 Order now Single Cell     Li-Ion/Li-Polymer     32000     I2C     100     None     System     Dynamic Voltage Correlation         No Sense Resistor Required     -40 to 85     DSBGA | 9     9DSBGA: 3 mm2: 1.75 x 1.75 (DSBGA | 9)    
BQ35100 Order now Single Cell     Primary Lithium     32000     I2C     100     None     Pack
System    
Primary         Accumulated Coulomb Count     -40 to 85     TSSOP | 14     14TSSOP: 32 mm2: 6.4 x 5 (TSSOP | 14)