1
Charging System Safety Circuit
The ISL9211 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 ISL9211 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 ISL9211 has a logic
flag output to indicate a fault condition.
Typical Application Circuit
Features
• 24V Max Input Voltage
• Supports Up To 1.5A 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
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”
Pinout
ISL9211
(8 LD 2x2 ΜTDFN)
TOP VIEW
Ordering Information
PART NUMBER
PART
MARKING
TEMP
RANGE
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL9211IRU58XZ-T* 15X -40 to +85 8 Ld µTDFN L8.2x2
ISL9211IRU68XZ-T* 16X -40 to +85 8 Ld µTDFN L8.2x2
*Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets; molding compounds/die attach
materials and NiPdAu plate - e4 termination finish, which is 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.
INPUT
ISL6292
BATTERY
CHARGER
R
VB
ISL9211
C
1
ILIM
R
ILIM
FAULT
VIN
GND
VB
OUT
BATTERY
PACK
C
2
2
3
4
1
7
6
5
8
VIN
GND
NC
FAULT
OUT
ILIM
VB
GND
FN6658.4
ISL9211
Data Sheet January 13, 2009
N
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E
C
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M
M
E
N
D
E
D
F
O
R
N
E
W
D
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S
I
G
N
S
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C
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M
M
E
N
D
E
D
R
E
P
L
A
C
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M
E
N
T
P
A
R
T
I
S
L
9
2
1
1
B
I
R
U
5
8
X
Z
-
T
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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