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DATASHEET
ISL9209
Charging System Safety Circuit
The ISL9209 is an integrated circuit (IC) optimized to provide
a redundant safety protection to a Li-ion battery 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 temperature exceeds
140°C. Together with the battery charger IC and the
protection module in a battery pack, the charging system
using the ISL9209 has triple-level protection and is two-fault
tolerant.
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 the input is overvoltage in order to remove the
power before any damage occurs. The ISL9209 has a logic
warning output to indicate the fault and an enable input to
allow the system to remove the input power.
Ordering Information
PART NUMBER PART
TEMP.
PACKAGE PKG.
(NOTE) MARKING RANGE (°C) (Pb-Free) DWG. #
ISL9209IRZ 09Z
-40 to 85 12 Ld 4x3 TDFN L12.4x3A
ISL9209IRZ-T 09Z
12 Ld 4x3 TDFN 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
INPUT VIN OUT
C1
ISL6292
Battery
Charger
RILIM
ISL9209
ILIM VB
EN
GND
WRN
RVB
Battery
Pack
FN6274
Rev 0.00
April 25, 2006
Features
• Fully Integrated Protection Circuit for Three Protected
Variables
• High Accuracy Protection Thresholds
• User Programmable Over-Current Protection Threshold
• Input Over-Voltage Protection in Less Than 1s
• High Immunity of False Triggering Under Transients
• Warning Output to Indicate the Occurrence of Faults
• Enable Input
• Easy to Use
• Thermal Enhanced TDFN Package
• Pb-Free Plus Anneal Available (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
ISL9209
(4x3 TDFN)
TOP VIEW
VIN 1
VIN 2
GND 3
WRN 4
NC 5
NC 6
EPAD
12 NC
11 OUT
10 OUT
9 ILIM
8 VB
7 EN
FN6274 Rev 0.00
April 25, 2006
Page 1 of 11

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ISL9209
Absolute Maximum Ratings (Reference to GND)
Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to 30V
Output and VB Pin (OUT, VB) (Note 1) . . . . . . . . . . . . . . . -0.3 to 7V
Other Pins (ILIM, WRN, EN) . . . . . . . . . . . . . . . . . . . . . -0.3 to 5.5V
ESD Rating
Human Body Model (Per MIL-STD-883 Method 3015.7) . . .3500V
Machine Model (Per EIAJ ED-4701 Method C-111) . . . . . . . .350V
Recommended Operating Conditions
Ambient Temperature Range . . . . . . . . . . . . . . . . . . . .-40°C to 85°C
Supply Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3V to 5.5V
Operating Current Range. . . . . . . . . . . . . . . . . . . . . . . . . 0A to 1.0A
Thermal Information
Thermal Resistance (Typical, Note 2, 3) JA (°C/W) JC (°C/W)
4X3 TDFN Package . . . . . . . . . . . . . . .
41
3.5
Maximum Junction Temperature (Plastic Package) . . . . . . . . 150°C
Maximum Storage Temperature Range . . . . . . . . . . . -65°C to 150°C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300°C
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES:
1. 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.
2. 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.
3. JC, “case temperature” location is at the center of the exposed metal pad on the package underside. See Tech Brief TB379.
Electrical Specifications Typical values are tested at VIN = 5V and 25°C Ambient Temperature, maximum and minimum values are
guaranteed over the recommended operating conditions, unless otherwise noted.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNITS
POWER-ON RESET
Rising VIN Threshold
POR Hysteresis
VPOR
2.45 -
- 125
3.0
-
V
mV
VIN Bias Current
VIN Bias Current
IVIN When enabled
When disabled
0.75 0.9 1.05 mA
30 60 100 A
PROTECTIONS
Input Overvoltage Protection (OVP)
Input OVP Hysteresis
VOVP
5.65 5.85
6.0
- 50 100
V
mV
Input OVP Falling Threshold
5.55 - - V
Input OVP Propagation Delay
- - 1 s
Overcurrent Protection
Overcurrent Protection Blanking Time
Battery Overvoltage Protection Threshold
Battery OVP Threshold Hysteresis
IOCP
BTOCP
VBOVP
VVB = 3V, RILIM = 25k
0.93 1.0 1.07
- 170 -
4.325 4.4 4.475
- 75 -
A
s
V
mV
Battery OVP Falling Threshold
4.225
-
-
V
Battery OVP Blanking Time
VB Pin Leakage Current
Over Temperature Protection Rising Threshold
BTBOVP
VVB = 4.4V
- 180 -
s
- - 20 nA
- 140 -
°C
Over Temperature Protection Falling Threshold
- 90 - °C
LOGIC
EN Input Logic HIGH
1.5 - - V
EN Input Logic LOW
- - 0.4 V
EN Internal Pull Down Resistor
100 200 400
k
WRN Output Logic Low
Sink 5mA current
- 0.35 0.8
V
WRN Output Logic High Leakage Current
- - 1 A
POWER MOSFET
On Resistance
RDS(ON) Measured at 500mA, 4.3V < VIN < 5.5V - 250 450 m
FN6274 Rev 0.00
April 25, 2006
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ISL9209
Pin Descriptions
VIN (Pin1, 2)
The input power source. The VIN can withstand 30V input.
GND (Pin 3)
System ground reference.
WRN (Pin 4)
WRN is an open-drain logic output that turns LOW when any
protection event occurs.
NC (Pin 5, 6, 12)
No connection and must be left floating.
EN (Pin 8)
Enable input. Pull this pin to low or leave it floating to enable
the IC and force it to high to disable the IC.
Typical Applications
INPUT
C1
RILIM
VIN OUT ISL6292
Battery
Charger
ISL9209
ILIM VB
EN
GND
WRN
RVB
Battery
Pack
VB (Pin 8)
Battery voltage monitoring input. This pin is connected to the
battery pack positive terminal via an isolation resistor.
ILIM (Pin 9)
Overcurrent protection threshold setting pin. Connect a
resistor between this pin and GND to set the OCP threshold.
OUT (Pin 10, 11)
Output pin.
EPAD
The exposed pad at the bottom of the TDFN package for
enhancing thermal performance. Must be electrically
connected to the GND pin.
PART
RILIM
RVB
C1
DESCRIPTION
25k
200kto 1M
1µF/16V X5R ceramic capacitor
Block Diagram
INPUT VIN
R1
POR
Pre-reg
Ref
FET
Driver
Q1
Q2
CP2
Q3
EA
OUT
ILIM
ISL6292
Battery
Charger
RILIM
CP1
R2 1.2V
Q4
WRN
GND
Logic
Q5
CP3
R5
0.8V
VB
R3 BUF
R4
EN
FIGURE 1. BLOCK DIAGRAM
RVB
FN6274 Rev 0.00
April 25, 2006
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ISL9209
Typical Operating Performance The test conditions for the Typical Operating Performance are: VIN = 5V, TA = 25°C,
RILIM = 25.5k, RVB = 200k, Unless Otherwise Noted.
VIN (1V/div)
OUT (1V/div)
Load Current
(200mA/div)
Time: 5ms/div
FIGURE 2. CAPTURED WAVEFORMS FOR POWER-UP. THE
OUTPUT IS LOADED WITH A 10RESISTOR
VIN (2V/div)
OUT (2V/div)
WRN (5V/div)
Time: 5s/div
FIGURE 3. CAPTURED WAVEFORMS WHEN THE INPUT
VOLTAGE STEPS FROM 5.5V TO 9.5V
Time: 500ms/div
OUT (2V/div)
VIN (2V/div)
WRN (5V/div)
FIGURE 4. CAPTURED WAVEFORMS WHEN THE INPUT
GRADUALLY RISES TO THE INPUT
OVERVOLTAGE THRESHOLD
VIN (2V/div)
OUT (2V/div)
WRN (5V/div)
Time: 5ms/div
FIGURE 5. TRANSIENT WHEN THE INPUT VOLTAGE STEPS
FROM 6.5V TO 5.5V
VIN (2V/div)
OUT (2V/div)
ILIM (1V/div)
WRN (5V/div) Time: 500s/div
FIGURE 6. TRANSIENT WAVEFORMS WHEN INPUT STEPS
FROM ZERO TO 9V
FN6274 Rev 0.00
April 25, 2006
Time: 20s/div
VIN (1V/div)
VB (1V/div)
OUT (1V/div)
WRN (5V/div)
FIGURE 7. BATTERY OVERVOLTAGE PROTECTION. THE IC
IS LATCHED OFF AFTER 16 COUNTS OF
PROTECTION. VB VOLTAGE VARIES BETWEEN
4.3V TO 4.5V
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ISL9209
Typical Operating Performance The test conditions for the Typical Operating Performance are: VIN = 5V, TA = 25°C,
RILIM = 25.5k, RVB = 200k, Unless Otherwise Noted. (Continued)
Time: 200ms/div
VIN (1V/div)
Time: 10ms/div
VIN (1V/div)
OUT (1V/div)
Load Current
(500mA/div)
WRN (5V/div)
Load Current
(500mA/div)
OUT (1V/div)
WRN (5V/div)
FIGURE 8. POWER-UP WAVEFORMS WHEN OUTPUT IS
SHORT-CIRCUITED
FIGURE 9. ZOOMED-IN VIEW OF FIGURE 8 (BLUE: LOAD
CURRENT; PINK: OUT PIN VOLTAGE)
1000
900
800
700 ENABLED
600
500
400
DISABLED
300
200
100
0
0 5 10 15 20 25 30 35
INPUT VOLTAGE (V)
FIGURE 10. INPUT BIAS CURRENT vs INPUT VOLTAGE
WHEN ENABLED AND DISABLED
1000
900
800
5V/ENABLED
4.3V/ENABLED
700
600 30V/ENABLED
500
400
300 30V/DISABLED
200 5V/DISABLED 4.3V/DISABLED
100
0-50 -20 10 40 70 100 130
TEMPERATURE (°C)
FIGURE 11. INPUT BIAS CURRENT AT DIFFERENT INPUT
VOLTAGES WHEN ENABLED AND DISABLED
2.82
2.8
2.78
2.76
RISING THRESHOLD
2.74
2.72
2.7
2.68
2.66
FALLING THRESHOLD
2.64
2.62
-50 -20 10 40 70 100
TEMPERATURE (°C)
FIGURE 12. VPOR vs TEMPERATURE
130
FN6274 Rev 0.00
April 25, 2006
5.86
5.84
5.82
5.8
RISING THRESHOLD
5.78
5.76
FALLING THRESHOLD
5.74
5.72
-50 -20
10
40
70 100
TEMPERATURE (°C)
FIGURE 13. INPUT OVERVOLTAGE PROTECTION
THRESHOLDS vs TEMPERATURE
130
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