DATASHEET
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.
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
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”
INPUT
VIN
C
1
OUT
C
2
ISL6292
BATTERY
CHARGER
ISL9211A
ILIM
VB
EN
R
ILIM
GND
FAULT
R
VB
DISA
ENA
BATT
PACK
FIGURE 1. TYPICAL APPLICATION CIRCUIT
November 5, 2014
FN6702.3
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
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Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
ISL9211A
Block Diagram
IN P U T
V IN
Q
1
Q
2
Q
3
OUT
IS L 6 2 9 2
BATTERY
CHARGER
IL IM
R
1
POR
P R E -R E G
REF
FET
D R IV E R
R
IL IM
CP2
EA
CP1
R
2
1 .2 V
Q
4
L O G IC
0 .8 V
CP3
R
3
R
4
VB
R
VB
FAULT
GND
EN
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ISL9211A
Pin Configuration
ISL9211A
(8 LD µTDFN)
TOP VIEW
VIN 1
GND 2
NC 3
FAULT 4
PAD
8 OUT
7
ILIM
6 VB
5 EN
Pin Descriptions
SYMBOL
VIN
GND
NC
FAULT
EN
VB
ILIM
OUT
-
PIN NUMBER
1
2
3
4
5
6
7
8
PAD
DESCRIPTION
The input power source. The VIN can withstand 24V input.
System ground reference.
No connection and must be left floating.
FAULT is an open-drain logic output that turns LOW when any protection event occurs.
IC enable pin. Pull this pin to LO to enable the device and pull it to HI to disable.
Battery voltage monitoring input. This pin is connected to the battery pack positive terminal via an isolation resistor.
Overcurrent protection threshold setting pin. Connect a resistor between this pin and GND to set the OCP threshold.
Output pin.
Exposed pad. Connect to system ground
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
ISL9211AIRU48XZ-T
ISL9211AIRU58XZ-T
ISL9211AIRU68XZ-T
ISL9211AIRU48EVZ
ISL9211AIRU58EVZ
ISL9211AIRU68EVZ
NOTES:
1. Please refer to
TB347
for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and NiPdAu-Ag 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.
3. For Moisture Sensitivity Level (MSL), please see device information page for
ISL9211A.
For more information on MSL please see techbrief
TB363.
4XE
5XX
6XX
Evaluation Board
Evaluation Board
Evaluation Board
PART
MARKING
TEMP RANGE
(°C)
-40 to +85
-40 to +85
-40 to +85
PACKAGE
Tape and Reel
(Pb-free)
8 Ld µTDFN
8 Ld µTDFN
8 Ld µTDFN
PKG.
DWG. #
L8.2x2B
L8.2x2B
L8.2x2B
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ISL9211A
Absolute Maximum Ratings
Supply Voltage (V
IN
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 26V
Output and VB Pin (OUT, VB) (Note 4) . . . . . . . . . . . . . . . . . . . . . -0.3V to 8V
Other Pins (ILIM, FAULT, EN) . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 5.5V
ESD Rating
Human Body Model (Tested per JESD22-A114F) . . . . . . . . . . . . . . . . 3kV
Machine Model (Tested per JESD22-A115-A) . . . . . . . . . . . . . . . . . 200V
Latch Up (Tested per JESD78B; Class II, Level A) . . . . . . . . . . . . . . . 100mA
Thermal Information
Thermal Resistance (Typical)
JA
(°C/W)
JC
(°C/W)
8 Ld 2x2 µTDFN (Notes 5, 6). . . . . . . . . . . . .
98
37
Maximum Junction Temperature (Plastic Package) . . . . . . . . . . . .+150
°
C
Maximum Storage Temperature Range . . . . . . . . . . . . . . -65
°
C to +150
°
C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Recommended Operating Conditions
Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Supply Voltage, V
IN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3V to 24V
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4. The maximum voltage rating for the VB pin under continuous operating conditions is 5.5V. All other pins are allowed to operate continuously at the
absolute maximum ratings.
5.
JA
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief
TB379.
6. For
JC
, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
(Note 8)
TYP
MAX
(Note 8)
UNITS
POWER-ON RESET
V
IN
Threshold
V
POR
Rising
Falling
V
IN
Bias Current
I
VIN
R
ILIM
= 24.9k, EN = L
EN = H
PROTECTIONS
Input Overvoltage Protection
V
OVP
ISL9211ARU48
ISL9211ARU58
ISL9211ARU68
Input OVP Hysteresis
Input OVP Falling Threshold
ISL9211ARU48
ISL9211ARU58
ISL9211ARU68
Input OVP Response Time (Note 7)
Overcurrent Protection
Maximum Output Current
Overcurrent Protection Blanking Time
Battery Overvoltage Protection Threshold
Battery OVP Threshold Hysteresis
Battery OVP Blanking Time
VB Pin Leakage Current
BT
BOVP
V
VB
= 4.34V
I
OCP
I
MAX
BT
OCP
V
BOVP
V
VB
= 3V, R
ILIM
= 24.9k
R
ILIM
= 9.53k
4.6
5.6
6.6
-
4.55
5.55
6.55
-
0.93
-
-
4.25
-
-
-
4.8
5.8
6.8
100
-
-
-
-
1.0
2.0
180
4.34
30
180
-
5.0
6.0
7.0
-
-
-
-
1
1.07
-
-
4.40
-
-
20
V
V
V
mV
V
V
V
µs
A
A
µs
V
mV
µs
nA
-
2.20
-
-
-
-
-
80
2.47
-
1000
-
V
V
µA
µA
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ISL9211A
Electrical Specifications
PARAMETER
Over-Temperature Protection Rising Threshold
Over-Temperature Protection Falling Threshold
LOGIC
EN Input Logic HIGH
EN Input Logic LOW
EN Internal Pull-down Resistor
FAULT Output Logic Low
FAULT Output Logic High Leakage Current
Sink 5mA current
Pin Voltage = 4.2V
1.5
-
-
-
-
-
-
200
0.4
-
-
0.4
-
0.8
1.5
V
V
k
V
µA
(Continued)
SYMBOL
TEST CONDITIONS
MIN
(Note 8)
-
-
TYP
150
110
MAX
(Note 8)
-
-
UNITS
°C
°C
POWER MOSFET
On-Resistance (Note 7)
NOTES:
7. Limits should be considered typical and are not production tested.
8. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested.
r
DS(ON)
Measured at 200mA
-
170
280
m
Typical Application
INPUT
VIN
C
1
OUT
ISL6292
BATTERY
CHARGER
C
2
ISL9211A
ILIM
R
ILIM
GND
VB
EN
FAULT
R
VB
DISA
ENA
BATT
PACK
TABLE 1. TYPICAL COMPONENT VALUES
PART
R
ILIM
R
VB
C
1,
C
2
24.9k
200k to 1M
1µF/25V X5R ceramic capacitor
DESCRIPTION
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FN6702.3
November 5, 2014
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