• Analog Interface for Host Cell Measurement
  • Cell Input MUX, Level Shifter, and Scaler
  • 1.5-/ 3.0-V Low-Drift, Calibrated Reference Allows Accurate Analog-to-Digital Conversions
• Analog Interface for Host Current Measurement
  • Variable Gain Current Sense Amplifier Capable of Operation with 1-mΩ Sense Resistor
• Switchable Thermistor Bias Output for Host Temperature Measurements
• Overcurrent Comparator With Dynamically Adjustable Threshold
  • Alerts Host to Potential Overcurrent Faults
  • Wakes up Host on Load Connect
• Integrated Cell Balancing FETs
  • Individual Host Control
  • 50 mA per Cell Balancing Current
• Supports Cell Sense-Line Open Wire Detection
• Integrated 3.3-V Regulator for Powering Micro-Controller and/or LEDs
• I2C Interface for Host Communications
  • Optional Packet CRC for Robust Operation
• Supply Voltage Range From 4.2 to 26.4 V
• Low Power Consumption
  • 40 µA Typical in Normal Mode
  • 1.5 µA Maximum in Sleep Mode
• 20-Pin TSSOP or 24-Pin VQFN Package

• Primary Protection in Li-Ion Battery Packs
  • Cordless Power Tools
  • Light Electric Vehicles (E-Bike, Scooter, etc.)
  • UPS Systems
  • Medical Equipment
  • Portable Test Equipment

The bq76925 host-controlled analog front end (AFE) is part of a complete pack monitoring, balancing, and protection system for 3-, 4-, 5-, or 6-series cell Li-Ion and Li-Polymer batteries. The bq76925 device allows a Host controller to monitor individual cell voltages, pack current and temperature easily. The Host may use this information to determine unsafe or faulty operating conditions such as overvoltage, under- voltage, overtemperature, overcurrent, cell imbalance, state of charge, and state of health conditions.

Cell input voltages are level-shifted, multiplexed, scaled, and output for measurement by a Host ADC. A dedicated pin provides a low-drift calibrated reference voltage to enable accurate measurements.