BQ28550 Single cell Li-ion battery gas gauge and protection |

This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
Single cell Li-ion battery gas gauge and protection


Recommended alternative parts

  • BQ27742-G1  - The device has the SAME FUNCTIONALITY as the compared device, but is not pin-for-pin equivalent and may not be parametrically equivalent.   This is an improved gauge with integrated protector.


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.


  • 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


Compare all products in Battery fuel gauges Email Download to Excel
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 Features Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
BQ28550 Order now Single Cell     Li-Ion/Li-Polymer     6000     SMBus     300     None     Pack     CEDV     SHA-1 Authentication     -40 to 85     SON | 12     12SON: 10 mm2: 2.5 x 4 (SON | 12)    
BQ28400 Samples not available 2-4 Cells     Li-Ion/Li-Polymer     32000     SMBus     500       Pack     CEDV       -40 to 85     TSSOP | 20     20TSSOP: 42 mm2: 6.4 x 6.5 (TSSOP | 20)