The ISL9211B is an integrated circuit (IC) optimized to provide

a redundant safety protection to a Li-ion battery charging

system. The IC monitors input voltage, battery voltage, and

charge current. When any of these parameters exceeds its

limit, the IC turns off an internal N-channel MOSFET to remove

power from the charging system to the battery. The IC also

monitors its own internal temperature and turns off the

N-channel MOSFET when the temperature exceeds +150°C.

Together with the battery charger IC and the protection module

in a battery pack, the charging system using the ISL9211B has

triple-level protection and is two-fault tolerant.

The IC is designed to turn on the internal NFET slowly, to avoid

in-rush current at power-up. It turns off the NFET quickly when

the input is overvoltage, to remove power before damage

occurs. The ISL9211B has a logic flag output to indicate a fault

condition. The enable input allows the system to cut off the

input power, if needed.

Features

• 24V Max Input Voltage

• Supports Up To 2.0A Input Current

• Fully Integrated Protection Circuit for Three Protected

Variables

• High Accuracy Protection Thresholds

• User Programmable Overcurrent Protection Threshold

• Responds to Input Overvoltage in Less Than 1µs

• High Immunity of False Triggering Under Transients

• Fault Indication for Various Fault Occurrence

• Easy to Use

• Pb-Free (RoHS Compliant)

Applications

• Cell Phones

• Digital Still Cameras

• PDAs and Smart Phones

• Portable Instruments

• Desktop Chargers