BQ27742-G1

• Battery Fuel Gauge and Protector for Single-Cell Li-Ion Applications
• Microcontroller Peripheral Provides:
  • Precision 16-Bit, High-Side Coulomb Counter with Low-Value Sense Resistor
    (5 mΩ to 20 mΩ)
  • External and Internal Temperature Sensors for Battery Temperature Reporting
  • Lifetime and Current Data Logging
  • 64 Bytes of Non-Volatile Scratch Pad Flash
  • SHA-1 Authentication Capability
• Battery Fuel Gauging Based on Patented Impedance Track™ Technology
  • Models Battery Discharge Curve for Accurate Time-To-Empty Predictions
  • Automatically Adjusts for Aging, Self-Discharge, and Temperature- and Rate-Induced Effects on Battery
• Integrated High-side NMOS Protection FET Drive
• Hardware-based Safety and Protection:
  • Overvoltage (OVP)
  • Undervoltage (UVP)
  • Overcurrent in Charge (OCC)
  • Overcurrent in Discharge (OCD)
  • Short-Circuit in Discharge (SCD)
• I²C and HDQ Interface Formats for Communication with Host System
• Ultra-Compact, 15-Ball NanoFree™ DSBGA

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The Texas Instruments bq27742-G1 is a fuel gauge for single-cell Li-Ion battery packs that uses patented Impedance Track™ technology to deliver rate-, temperature-, and aging-compensated predictions of remaining battery capacity and system runtime with highest accuracy. The device also includes a fully integrated high-side protector that eliminates the need for a separate Li-Ion protection circuit and provides a full suite of high-accuracy fault detections for overvoltage, undervoltage, overcurrent in charge, overcurrent in discharge, and short-circuit in discharge conditions. The hardware protection functions offer built-in data flash-based programmability, allowing simple reconfiguration of existing devices for varying end equipment needs.

The fuel gauge provides information such as remaining battery capacity (mAh), state-of-charge (%), runtime to empty (minutes), voltage (mV), current (mA), and temperature (°C), as well as recording vital parameters throughout the lifetime of the battery. The device also supports interrupts to the host to indicate detection of a variety of important battery conditions to the system.

The DSBGA is a 15-ball package (2.78 mm × 1.96 mm) that is ideal for space-constrained applications.