The ISL9209C is an integrated circuit (IC) optimized to

provide a redundant safety protection to a Li-ion battery 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

temperature exceeds +140°C. Together with the battery

charger IC and the protection module in a battery pack, the

charging system using the ISL9209C has triple-level

protection and is two-fault tolerant.

The IC is designed to turn on the internal PFET slowly to

avoid in-rush current at power-up but will turn off the PFET

quickly when the input is overvoltage in order to remove the

power before any damage occurs. The ISL9209C has a logic

warning output to indicate the fault and an enable input to

allow the system to remove the input power.

Features

• Fully Integrated Protection Circuit for Three Protected

Variables

• High Accuracy Protection Thresholds

• User Programmable Overcurrent Protection Threshold

• Input Overvoltage Protection in Less Than 1µs

• High Immunity of False Triggering Under Transients

• Warning Output to Indicate the Occurrence of Faults

• Enable Input

• Easy to Use

• Thermal Enhanced TDFN Package

• Pb-Free (RoHS Compliant)

Applications

• Cell Phones

• Digital Still Cameras

• PDAs and Smart Phones

• Portable Instruments

• Desktop Chargers