ISL9211A Datasheet, PDF (1/12 Pages) Intersil Corporation – Charging System Safety Circuit

Charging System Safety Circuit
ISL9211A
The ISL9211A is an integrated circuit (IC) optimized to
provide a redundant safety protection to a Li-ion battery
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 N-channel MOSFET to remove the power from
the charging system to the battery. In addition to the
above protected parameters, 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
ISL9211A has triple-level protection and is two-fault
tolerant.
The IC is designed to turn on the internal NFET slowly to
avoid inrush current at power up but will turn off the
NFET quickly when the input is overvoltage in order to
remove the power before any damage occurs. The
ISL9211A 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*(see page 11)
• 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*(see page 11)
• Cell Phones
• Digital Still Cameras
• PDAs and Smart Phones
• Portable Instruments
• Desktop Chargers
Typical Application Circuit
INPUT
C₁
VIN
OUT
C2
ISL6292
BATTERY
CHARGER
R_ILIM
ISL9211A
ILIM
VB
EN
GND
FAULT
RVB
DISA
ENA
BATT
PACK
August 25, 2010
FN6702.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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