Product details


Cell chemistry Li-Ion/Li-Polymer Number of series cells Single Cell Communication interface SMBus Battery capacity (Min) (mAh) 300 Battery capacity (Max) (mAh) 6000 Implementation Pack External capacity indication None Features SHA-1 Authentication Operating temperature range (C) -40 to 85 open-in-new Find other Battery fuel gauges

Package | Pins | Size

VSON (DRZ) 12 10 mm² 4 x 2.5 open-in-new Find other Battery fuel gauges


  • A Comprehensive Single-Cell Li-Ion Battery Gas
    Gauge and Protection Integrates All Essential
    • Low-Side N-CH FET Protection Control
    • JEITA/Enhanced Charging
    • Authentication
  • Records Battery Gas Gauge Information
  • Protection Functions Help to Prevent:
    • Short-Circuit
    • Overcurrent Charge and Discharge
    • Overvoltage Charge (Overcharge)
    • Undervoltage (Over-Discharge)
  • Firmware Control of Discharge FET
  • SHA-1/HMAC Battery Authentication
  • General Purpose I/O Configurable for One
    of the Following:
    • CFET Control
    • ALERT Output
  • I2C Communications Interface with
    SBS Command Set Operation
  • 12-pin, 2.50-mm × 4.00-mm SON Package
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The Texas Instruments bq28550-R1 battery gas gauge provides current and voltage protection, and secure, SHA-1/HMAC authentication for single-cell Lithium-Ion battery packs. Designed for battery-pack integration, the bq28550-R1 requires host microcontroller firmware support for implementation. A system processor communicates with the bq28550-R1 using a serial interface to obtain remaining battery capacity, system run-time predictions, and other critical battery information.

The bq28550-R1 gas gauge uses an accurate gas gauging algorithm to report the status of the cell. The gauge provides information such as state-of-charge (%), run-time-to-empty (min.), charge-time to full (min.), battery voltage (V), and pack temperature (°C).

The bq28550-R1 gas gauge also features integrated support for secure battery-pack authentication, using the SHA-1/HMAC authentication algorithm.

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BQ27742-G1 ACTIVE Single cell Li-ion battery fuel gauge with integrated protection | battery gas gauge This is an improved gauge with integrated protector.

Technical documentation

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Type Title Date
* Datasheet bq28550-R1 Single Cell Li-Ion Battery Gas Gauge and Protection datasheet (Rev. A) Jun. 12, 2014

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Software development

Gauging Parameter Calculator for CEDV gauges
GPCCEDV Gauging Parameter Calculator (GPC) is a math calculation and simulation tool that helps the battery designer to obtain matching Compensated End of Discharge Voltage (CEDV) coefficients for the specific battery profile. The tool allows the user to increase the accuracy of the fuel gauge IC over (...)
MathCAD compensated end of discharge voltage (CEDV) tool
MATHCAD_CEDV_SOFTWARE Math calculation and simulation tool that helps the battery designer to obtain matching CEDV coefficients for the specific chemistry in the battery pack using one of TI’s CEDV algorithm based fuel gauge. It accepts 3 pairs of log files that can be created by using TI’s bq Smart Battery (...)

Accepts 6 log files and configuration data and calculates best CEDV coefficients

    Generation of log files

    Procedure Summary

  • Continuous discharge at 2 different rates, from fully charged state until termination voltage is reached.
  • Time, voltage, current and temperature (directly on the cells) must be (...)
SLUC300.ZIP (5957 KB)

Design tools & simulation

document-generic User guide
SLUC042.ZIP (1031 KB)

CAD/CAE symbols

Package Pins Download
SON (DRZ) 12 View options

Ordering & quality

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  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Support & training

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