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Datasheet
April 19, 2005
ISL6292B
FN9139 .1
Li-ion/Li Polymer Battery Charger
The ISL6292B uses Intersil’s patent-pending dual-mode
charge technology to minimize the heat in a linear charger.
The ISL6292B is a modification of the original ISL6292 and
is optimized for cellular phone travel charger applications.
The low-heat generation feature of the dual-mode charger
enables the charger IC to be placed inside the connector of
the travel charger to completely remove the influence of the
adapter cable on the charging performance.
Working with a current-limited ac/dc converter, the dual-
mode charger charges a Li-ion battery with the same current
profile as a traditional linear charger. The constant charge
current is determined by the current limit of the ac/dc
converter. The constant output voltage is fixed at 4.2V. When
the battery voltage is below 2.8V, the charger preconditions
the battery with a low trickle-charge current. The charge
status is indicated by a tri-color LED. A safety timer prevents
charging a dead battery for an excessively long period.
The ISL6292B also features a thermal foldback function that
automatically reduces the charge current when the internal
die temperature exceeds a 100°C limit to prevent further
temperature rise. This function removes the concern of
thermal failure in the targeted space-limited applications. An
ambient temperature monitoring circuit allows users to set
two separate temperature limit levels, one for during charge
and one for not during charge. The thermally-enhanced QFN
package further improves the thermal performance of the
ISL6292B in space-limited applications.
Ordering Information
PART NUMBER TEMP. RANGE (°C) PKG. DWG. #
ISL6292BCR*
-20 to 70
16 Ld 4x4 QFN
ISL6292BCRZ* (Note)
-20 to 70
16 Ld 4x4 QFN
(Pb-free)
*Add “-T” suffix for tape and reel.
NOTE: Intersil Pb-free 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.
Pinout
ISL6292B TOP VIEW
16 15 14 13
VIN 1
GRN 2
RED 3
TIME 4
12 VSEN
11 TEMP
10 IMIN
9 IREF
5678
Features
• Complete Charger for Single-Cell Li-ion Batteries
• Integrated Pass Element and Current Sensor
• No External Blocking Diode Required
• Very Low Thermal Dual-Mode Operation
• 1% Voltage Accuracy with Remote Sense
• Programmable Current Limit up to 1.5A
• Programmable End-of-Charge Current
• Programmable Safety Timer
• Drives a Tri-Color LED
• Charge Current Thermal Foldback
• NTC Thermistor Interface for Battery Temperature Monitor
• Two-Level Ambient Temperature Setting
• Guaranteed to Operate at 2.65V After Start-Up
• Ambient Temperature Range: -20°C to 70°C
• Thermally-Enhanced QFN Packages
• QFN Package:
- Compliant to JEDEC PUB95 MO-220
QFN - Quad Flat No Leads - Package Outline
- Near Chip Scale Package footprint, which improves
PCB efficiency and has a thinner profile
• Pb-Free 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”
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-352-6832 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2004, 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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ISL6292B
Absolute Maximum Ratings
Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to 7V
Output Pin (BAT, VSEN, RED, GRN, DT) . . . . . . . . . . . -0.3 to 5.5V
Signal Pin (EN, TIME TEMP, IREF, IMIN, V2P9) . . . . . . -0.3 to 3.2V
Charge Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6A
ESD Rating
Human Body Model (Per MIL-STD-883 Method 3015.7) . . .3500V
Machine Model (Per EIAJ ED-4701 Method C-111) . . . . . . . .200V
Thermal Information
Thermal Resistance (Notes 1, 2)
θJA (°C/W) θJC (°C/W)
4x4 QFN Package . . . . . . . . . . . . . . . .
41
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
Recommended Charge Current. . . . . . . . . . . . . . . . 400mA to 1.5A
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. θJA 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. θJC, “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 -10°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 4.0
V
Falling VIN Threshold
2.3 2.4 2.7
V
STANDBY CURRENT
VBAT Pin Sink Current
VIN Pin Supply Current
VOLTAGE REGULATION
ISTANDBY
IVIN
VIN floating or EN pin is floating
BAT Pin floating, EN = LOW
- - 3.0 µA
- 0.5 - mA
Output Voltage
Dropout Voltage
CHARGE CURRENT
VCH
VBAT = 3.7V, ICHARGE = 0.65A
4.158 4.20 4.242
- 190 -
V
mV
Charge/Protection Current (Note 3)
Trickle Charge Current
End-of-Charge Threshold
RECHARGE THRESHOLD
ICHARGE
ITRICKLE
RIREF = 80k, VBAT = 3.7V, VIN = 5V
RIREF = 80k, VBAT = 2.0V, VIN = 5V
RIMIN = 133k
0.9 1.0 1.1
A
85 110 135 mA
40 60 80 mA
Recharge Voltage Threshold
TRICKLE CHARGE THRESHOLD
VRECHRG
3.85 4.00 4.13
V
Trickle Charge Threshold Voltage
BATTERY TEMPERATURE MONITORING
VMIN
2.7 2.8 3.2
V
Low Temperature Threshold
Low Temperature Hysteresis (Note 4)
VTMIN
V2P9 = 3.0V
1.44 1.50 1.58
- 214 -
V
mV
High Temperature Threshold
High Temperature Hysteresis (Note 4)
VTMAX V2P9 = 3.0V
0.35 0.38 0.405
V
- 51.4 -
mV
DT Pin MOSFET On Resistance
Charge Current Foldback Threshold (Note 4)
Current Foldback Gain (Note 4)
RDT
TFOLD
GFOLD
-
30 100
85 100 115 °C
- 100 - mA/°C
2 FN9139 .1
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ISL6292B
Electrical Specifications
Typical values are tested at VIN = 5V and 25°C Ambient Temperature, maximum and minimum values are
guaranteed over -10°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 INPUT AND OUTPUT
TOSC
CTIME = 15nF
2.4 3.0 3.6 ms
EN Input Low
- - 0.8 V
EN Pin External Pull Down to Disable
- - 50 k
RED Sink Current
Pin Voltage = 0.8V
5 - - mA
GRN Sink Current
Pin Voltage = 0.8V
5 - - mA
NOTES:
3. The actual current may be lower due to the thermal foldback.
4. Guaranteed by design, not a tested parameter.
3 FN9139 .1
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ISL6292B
Pin Description
VIN
VIN is the input power source. Connect to a wall adapter.
RED, GRN
RED and GRN are two open-drain outputs to drive a red and
a green LED in the same package. The RED and the GRN
pins are guaranteed to be capable of sinking at least 5mA
current.
TIME
The TIME pin determines the oscillation period by
connecting a timing capacitor between this pin and GND.
The oscillator provides a time reference for the charger.
GND
GND is the connection to system ground.
V2P9
This is a 2.9V untrimmed voltage output. This pin outputs a
2.9V voltage source when the input voltage is above POR
threshold, independent on the EN pin input. The V2P9 pin
can be used as an indication for adapter presence.
Typical Application
EN
EN is the enable logic input. Connect the EN pin to LOW to
enable the charger or leave it floating to disable the charger.
This pin is pulled up to 2.9V when left floating.
IREF
This is the programming input for the constant charging
current in a linear charger. In the typical application of a
dual-mode charger, the IREF pin programs the trickle charge
current as well as the protection current level.
IMIN
IMIN is the programmable input for the end-of-charge
current.
TEMP
TEMP is the input for an external NTC thermistor.
DT
DT is the input to set the temperature difference before and
after the charging starts. This pin can also be used as an
indication whether or not the charger is charging.
VSEN
VSEN is the battery voltage sensing input. This pin allows
remote sense of the battery pack voltage.
BAT
BAT is the charger output.
Input
C1
C2
D2
R1
RT
D1 RS
R5 R4
R2
VIN
V2P9
TEMP
DT
RED
GRN
GND
BAT
VSEN
EN
To Battery
C3
R3
C4
B AT +
B AT -
ID
T IM E
IREF
IM IN
CTIM E
RIREF
R IMIN
C1, C3: 1µF X5R ceramic capacitor
C2, C4: 0.1µF X5R ceramic capacitor
CTIME : 22nF X5R or better timing capacitor
D1, D2: dual-color (red and green) LED in one package
RIREF : 80k, 1%
RIMIN : 133k, 1%
R1: 41.2k, 1%
R2: TBD, value dependent on the T (2.3kfor 20°C)
RT: ECTH-160808-103-J-3800HT, 10kat 25°C, 5%
RS: 1.33k, 1%
R3: 10k, 5% (R3 and C4 are for improving ESD protection)
R4, R5: 330, 5%
4 FN9139 .1
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Block Diagram
ISL6292B
VIN
C1
IREF
RIR EF
IMIN
RIM IN
TEMP
DT
Q M AIN
Tem pera ture
M o n i to ri n g
IT
IR
Curre nt
Refe re nces
I M IN
QSEN
Re ference s
100000:1
Curre nt
Mirror
ISEN
Input_OK
+
C- A
CHRG
+
VA-
V IN
+
- VPOR
++
- 100mV
VCH
I SEN
V2P
8
NTC
Interfa ce
Trickle /Fa st
+
- MIN_I
Unde rTe m p
Ove rTe m p
LOGIC
+
Minbat -
VM IN
VR EC H R G
+
-
Re cha rge
TIME
GND
OSC
COUNTER
Input_OK
BAT
V2P9
VSEN
RED
GRN
EN
5 FN9139 .1
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