The ISL9212B is an integrated circuit (IC) optimized to provide a Li-ion battery redundant safety protection from failures of a charging system. The IC monitors the input voltage, the battery voltage, and the charge current. When any of the three parameters exceeds its limit, the IC turns off an internal P-Channel MOSFET to remove the power from the charging system. In addition to the above protected parameters, the IC also monitors its own internal temperature and turns off the P-Channel MOSFET when the die temperature exceeds +140°C. Together with the battery charger IC and the protection module in a battery pack, the charging system using the ISL9212B has triple-level protection and is two-fault tolerant.

The IC is designed to turn on the internal PFET slowly to avoid inrush current at power-up but will turn off the PFET quickly when input overvoltage is detected in order to remove the power before any damage occurs. The ISL9212B has a logic warning output to indicate the fault and an enable input to allow the system to remove the input power.

• Fully Integrated Protection Circuit for Three Protection Variables
  • User Programmable Overcurrent Protection Threshold
  • Input Overvoltage Protection in Less Than 1μs
  • Battery Overvoltage Protection
• High Immunity of False Triggering Under Transients
• High Accuracy Protection Thresholds
• Warning Output to Indicate the Occurrence of Faults
• Enable Input
• Thermal Enhanced DFN Package
• Pb-Free Plus Anneal Available (RoHS Compliant)

• Cell Phones
• Digital Still Cameras
• PDAs and Smart Phones
• Portable Instruments
• Desktop Chargers