• AEC-Q100 qualified for automotive applications
  • Temperature grade 1: –40°C ≤ T_A ≤ 125°C
  • HBM ESD classification level 2
  • CDM ESD classification level C4B
• 40-V load-dump tolerant to support charging back-up supercapacitor, 3-V to 18-V operating
• Automatic Sleep mode for low power consumption
  • 350-nA output leakage current
  • 2-µA input leakage current when charge disabled
• Support 1- to 4-cell supercapacitor charging from 0 V
• External resistor programmable operation
  • FB pin to adjust supercapacitor regulation voltage
  • ISET to set charge current from 10 mA to 800 mA
• High accuracy
  • ±1% charge voltage accuracy
  • ±10% charge current accuracy
• Charging features
  • CE pin for charging function control
  • Open-drain output for status and fault indication
  • Open-drain output for power-good indication
• Integrated fault protection
  • 18-V IN overvoltage protection
  • 1000-mA overcurrent protection
  • 125°C thermal regulation; 150°C thermal shutdown protection
  • ISET pin short protection

• Telematics control unit (TCU)
• Emergency call (eCall)
• Fleet management, asset tracking

The BQ25173-Q1 is an automotive rated, 800-mA linear charger for 1- to 4-cell supercapacitors targeted at space-limited applications. The device has a single power output that charges the supercapacitor. The system load can be placed in parallel with the supercapacitor and the charge current is shared between the system and supercapacitor.

During charging, an internal control loop monitors the IC junction temperature and reduces the charge current if the internal temperature threshold, T_REG, is exceeded. This feature allows for fast charging of a fully discharged supercapacitor.

The charger power stage and charge current sense functions are fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status display, and charge function control. The charge voltage and fast-charge current are programmable through external resistors.

Simplified Schematic