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ISL6292C
Li-ion/Li Polymer Battery Charger
The ISL6292C is an integrated single-cell Li-ion or
Li-polymer battery charger capable of operating with an input
voltage as low as 2.4V. This charger is designed to work with
various types of ac adapters.
The ISL6292C operates as a linear charger when the ac
adapter is a voltage source. The battery is charged in a
CC/CV (constant current/constant voltage) profile. The
charge current is programmable with an external resistor up
to 1.5A. The ISL6292C can also work with a current-limited
adapter to minimize the thermal dissipation, in which case
the ISL6292C combines the benefits of both a linear charger
and a pulse charger.
The ISL6292C features charge current thermal foldback to
guarantee safe operation when the printed circuit board is
space limited for thermal dissipation. Additional features
include preconditioning of an over-discharged battery,
automatic recharge, and thermally enhanced DFN package.
Ordering Information
TEMP.
PART # (NOTE) RANGE (°C)
PACKAGE
PKG.
DWG. #
ISL6292CCR3Z -20 to 70 10 Ld 3x3 DFN (Pb-free) L10.3x3
ISL6292CCR3Z-T 10 Ld 3x3 DFN Tape and Reel (Pb-free)
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
5V
Input
VIN VBAT
C1 ISL6292C
C2
Floating
to Enable
FAULT
STATUS
EN
VSEN
V2P8
IREF
TIME GND
CTIME
C3
RIREF
DATASHEET
FN9133
Rev.2.00
July 22, 2005
Features
• Complete Charger for Single-Cell Li-ion Batteries
• Very Low Thermal Dissipation
• Integrated Pass Element and Current Sensor
• No External Blocking Diode Required
• 1% Voltage Accuracy
• Programmable Current Limit up to 1.5A
• Charge Current Thermal Foldback
• Accepts Multiple Types of Adapters
• Guaranteed to Operate at 2.65V After Start Up
• Ambient Temperature Range: -20°C to 70°C
• Thermally-Enhanced DFN Packages
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• Handheld Devices including Medical Handhelds
• PDAs, Cell Phones and Smart Phones
• Portable Instruments, MP3 Players
• Self-Charging Battery Packs
• Stand-Alone Chargers
• USB Bus-Powered 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
ISL6292C (3x3 DFN)
TOP VIEW
VIN 1
FAULT
STATUS
TIME
2
3
4
GND 5
10 VBAT
9 VSEN
8 IREF
7 V2P8
6 EN
FN9133 Rev.2.00
July 22, 2005
Page 1 of 11

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ISL6292C
Absolute Maximum Ratings
Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to 7V
Output Pin Voltage (BAT, VSEN, V2P8). . . . . . . . . . . . . -0.3 to 5.5V
Signal Input Voltage (TIME, IREF). . . . . . . . . . . . . . . . . -0.3 to 3.2V
Output Pin Voltage (STATUS, FAULT) . . . . . . . . . . . . . . . . -0.3 to 7V
Charge Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6A
ESD Rating
Human Body Model (Per MIL-STD-883 Method 3015.7) . . .2500V
Machine Model (Per EIAJ ED-4701 Method C-111) . . . . . . . .200V
Thermal Information
Thermal Resistance (Notes 1, 2) . . . . . . . JA (°C/W) JC (°C/W)
3x3 DFN Package . . . . . . . . . . . . . .
46
4
Maximum Junction Temperature (Plastic Package) . . . . . . . . 150°C
Maximum Storage Temperature Range . . . . . . . . . . . -65°C to 150°C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300°C
Recommended Operating Conditions
Ambient Temperature Range . . . . . . . . . . . . . . . . . . . .-20°C to 70°C
Supply Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3V to 6.5V
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. 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.
2. 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 0°C to 70°C Ambient Temperature with a supply voltage in the range of 4.3V to 6.5V, unless
otherwise noted.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNITS
POWER-ON RESET
Rising VIN Threshold
3.0 3.4 3.95 V
Falling VIN Threshold
2.25 2.4 2.65
V
STANDBY CURRENT
VBAT Pin Sink Current
VIN Pin Supply Current
VIN Pin Supply Current
VOLTAGE REGULATION
ISTANDBY
IVIN
IVIN
VIN floating or EN = LOW
VBAT floating and EN pulled low
VBAT floating and EN floating
- - 3.0 A
- 30 - A
- 1 - mA
Output Voltage
Dropout Voltage
VCH
VBAT = 3.7V, 0.5A
4.20 4.256 4.30
- 175 -
V
mV
CHARGE CURRENT
Constant Charge Current (Note 3)
Trickle Charge Current
End-of-Charge Threshold
RECHARGE THRESHOLD
ICHARGE
ITRICKLE
IMIN
RIREF = 80k, VBAT = 3.7V
RIREF = 80k, VBAT = 2.0V
RIREF = 80k
0.9 1.0 1.1
A
- 110 - mA
85 110 135 mA
Recharge Voltage Threshold
TRICKLE CHARGE THRESHOLD
VRECHRG
3.90 4.053 4.155
V
Trickle Charge Threshold Voltage
TEMPERATURE MONITORING
VMIN
2.73 2.84 3.04
V
Charge Current Foldback Threshold (Note 4)
Current Foldback Gain (Note 4)
TFOLD
GFOLD
85 100 115 °C
- 100 - mA/°C
FN9133 Rev.2.00
July 22, 2005
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ISL6292C
Electrical Specifications
Typical values are tested at VIN = 5V and 25°C Ambient Temperature, maximum and minimum values are
guaranteed over 0°C to 70°C Ambient Temperature with a supply voltage in the range of 4.3V to 6.5V, unless
otherwise noted. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNITS
OSCILLATOR
Oscillation Period
LOGIC OUTPUTS
TOSC
CTIME = 15nF
2.4 3.0 3.6 ms
STATUS/FAULT Sink Current
Pin Voltage = 0.8V
5 - - mA
NOTES:
3. The actual charge current may be affected by the thermal foldback function if the thermal dissipation capability is not enough or by the on
resistance of the power MOSFET if the charger input voltage is too close to the output voltage.
4. Guaranteed by design, not a tested parameter.
Pin Descriptions
VIN (Pin 1)
VIN is the input power source. Connect to a wall adapter.
FAULT (Pin 2)
FAULT is an open-drain output indicating fault status. This
pin is pulled to LOW under any fault conditions. Any time a
FAULT condition happens, it will reset the counter of the
charger.
STATUS (Pin 3)
STATUS is an open-drain output indicating charging and
inhibit states. The STATUS pin is pulled LOW when the
charger is charging a battery. It will be forced to high
impedance when the charge current drops to IMIN. This high
impedance mode will be latched until a recharge cycle or a
new charge cycle starts.
TIME (Pin 4)
The TIME pin determines the oscillation period by
connecting a timing capacitor between this pin and GND.
The oscillator also provides a time reference for the charger.
GND (Pin 5)
GND is the connection to system ground.
EN (Pin 6)
EN is the enable logic input. Connect the EN pin to LOW to
disable the charger or leave it floating to enable the charger.
V2P8 (Pin 7)
This is a 2.8V reference voltage output. This pin outputs a
2.8V voltage source when the input voltage is above POR
threshold, otherwise it outputs zero. The V2P8 pin can be
used as an indication for adapter presence.
IREF (Pin 8)
This is the programming input for the constant charging
current. It maintains at 0.8V when the charger is in normal
operation.
VSEN (Pin 9)
VSEN is the remote voltage sense pin. Connect this pin as
close as possible to the battery pack positive connection. If
the VSEN pin is floating, its voltage drops to zero volt and
the charger operates in the Trickle mode.
VBAT (Pin 10)
VBAT is the connection to the battery. Typically a 10F
Tantalum capacitor is needed for stability when there is no
battery attached. When a battery is attached, only a 0.1F
ceramic capacitor is required.
FN9133 Rev.2.00
July 22, 2005
Page 3 of 11

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ISL6292C
Typical Applications
5V WALL
ADAPTER
C1
10µF
R1
1k
D1
VIN VBAT
R2
1k
D2
ISL6292C
FAULT
STATUS
EN
VSEN
V2P8
IREF
TIME GND
CTIME
15nF
C2
10µF
RIREF
80k
C3
1µF
BATTERY
PACK
Block Diagram
VIN
C1
IREF
R IREF
EN
TIME
GND
QMAIN
VBAT
TEMPERATURE
MONITORING
IT
IR
CURRENT
REFERENCES
IMIN = IR/10
QSEN
REFERENCES
100000:1
Current
Mirror
ISEN
Input_OK
+
C- A
CHRG
+
VA -
VIN
+
- VPOR
++
- 100mV
VC H
Trickle/Fast
ISEN +
- MIN_I
Mi n bat
+
-
VMIN
VRECHR G
+
Input_OK
LOGIC
-
Rec harge
VIN
ESDDiode
STATUS
V2P8
VSEN
STATUS
VIN
OSC
COUNTER
FAULT
FAULT
FN9133 Rev.2.00
July 22, 2005
FIGURE 1. BLOCK DIAGRAM
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ISL6292C
Charging Flow Chart
Power Up
VIN>VPOR ?
Y
POR
N
Initialization
Reset counter
Trickle
Charge
VSEN>VMIN?
N
Y
N 1/8 TIMEOUT?
Trickle
Charge
Y
CC Charge
VSEN>=VCH?
Y
N
N TIMEOUT?
Constant
Current
Charge
Y
CV Charge
Ich < IMIN ?
Y
N
N
TIMEOUNT?
Constant
Voltage
Charge
Y
set FAULT low
latch up charger
N
EN toggled ?
Y
EOC or FAULT
EOC indication:
set STATUS high
keepNFAULT high
TIMEOUT?
Y
N
charger inhibited
reset counter
VSEN
<
VRECHRG?
Y
Start recharge
Inhibit
N
FIGURE 2. CHARGING FLOW CHART
FN9133 Rev.2.00
July 22, 2005
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