Texas Instruments

bq28550 - Li-Ion Battery Gas Gauge

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

Image of Texas Instruments' BQ28550 Li-Ion Battery Gas GaugeTexas 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).  

Features
  • 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
Published: 2013-07-02

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