BQ28550 Li-Ion Battery Gas Gauge

Texas Instruments' single cell Li-Ion battery gas gauge with current and voltage protection

Texas Instruments bq28550 Li-Ion Battery Gas Guage Texas Instruments' bq28550 battery gas gauge provides current and voltage protection, and secure, SHA-1/HMAC authentication for single-cell Li-Ion battery packs. Designed for battery-pack integration, the bq28550 requires host microcontroller firmware support for implementation. A system processor communicates with the bq28550 using one of the serial interface configurations to obtain remaining battery capacity, system run-time predictions, and other critical battery information. The bq28550 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).  bq28550 Datasheet

  • Comprehensive, single-cell Li-Ion battery manager that integrates all essential functions including:
    • Gas gauge
    • Low-side N-CH FET protection control
    • JEITA/enhanced charging
    • Authentication
  • Battery gas gauge information
  • SHA-1/HMAC battery authentication
  • Protection functions including:
    • Short-circuit
    • Overcurrent charge and discharge
    • Overvoltage charge (overcharge)
    • Undervoltage (over-discharge)
    • Firmware control of discharge FET
  • SMBus communications interface

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Texas Instruments
Part Number
Part Number
Packaging Reel Size Description  
BQ28550DRZR-R1 296-29659-2-ND Tape & Reel 3,000 IC BATT GAS GAUGE LI-ION 12-SON BQ28550 Datasheet
296-29659-1-ND Cut Tape
296-29659-6-ND Digi-Reel®
BQ28550DRZT 296-32037-2-ND Tape & Reel 250
296-32037-1-ND Cut Tape
296-32037-6-ND Digi-Reel®