ISL9211B_14 Datasheet, PDF (1/12 Pages) Intersil Corporation – Charging System Safety Circuit

DATASHEET
Charging System Safety Circuit
ISL9211B
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.
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
• Technical Brief TB379 “Thermal Characterization of
Packaged Semiconductor Devices”
• Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN Packages”
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
INPUT
INPUT
C1
RLIM
VIN
OUT
C2
ISL9211B
ILIM
VB
EN
GND
FAULT
ISL6292
BATTERY
CHARGER
RVB
DISA
ENA
BATT
PACK
FIGURE 1. TYPICAL APPLICATION CIRCUIT
November 4, 2014
1
FN7861.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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