May 8, 2006
Charging System Safety Circuit
The ISL9212 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 ISL9212 has triple-level protection and is two-fault
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 ISL9212
has a logic warning output to indicate the fault and an enable
input to allow the system to remove the input power.
-40 to 85 12 Ld 4x3 TDFN L12.4x3A
ISL9200EVAL1 ISL9200 Evaluation Board
*Add “-T” suffix for tape and reel.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
compatible with both SnPb and Pb-free soldering operations. Intersil
Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
Typical Application Circuit
• Fully Integrated Protection Circuit for Three Protection
- 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
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
• Technical Brief TB379 “Thermal Characterization of
Packaged Semiconductor Devices”
• Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN Packages”
ISL9212 (4x3 DFN)
NOTE: EPAD must be electrically connected to the GND pin.
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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