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ISL6297
FN9215.2
Li-ion/Li Polymer Battery Charger
The ISL6297 is a Dual-Mode Lithium Ion battery charger
optimized for cellular phone travel charger applications. It
uses Intersil’s patent-pending dual-mode charge
technology to minimize the heat normally generated in a
linear charger. By minimizing the heat generation, the
ISL6297 can be placed inside the connector of the travel
charger to completely remove the influence of the adapter
cable on the charging performance.
The ISL6297 is an enhancement of the original ISL6292B.
New features include improved accuracy, pre-charge circuit
verification, and enhanced LED indicator function.
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 bi-color LED. A safety timer prevents
charging a dead battery for an excessively long period.
The ISL6297 also features THERMAGUARD™, 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, for charge and non-charge
conditions. The thermally-enhanced QFN package further
improves the thermal performance of the ISL6297 in space-
limited applications.
Pinout
ISL6297
(16 LD QFN)
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
• 0.7% Voltage Accuracy with Remote Sense
• Pre-charge circuit verification with LED status indication
• Drives a bi-color LED
• Programmable Safety Timer
• Programmable Current Limit up to 1.5A
• Programmable End-of-Charge Current
• THERMAGUARD™ 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 Plus Anneal Available (RoHS Compliant)
Applications
• PDAs, Cell Phones and Smart Phones
• Portable Instruments, MP3 Players
• Medical Handhelds
• Self-Charging Battery Packs
• Stand-Alone Chargers
Ordering Information
PART
NUMBER
PART
TEMP.
PKG.
MARKING RANGE (°C) PACKAGE DWG. #
ISL6297CR* ISL 6297CR -20 to +70 16 Ld 4x4 QFN L16.4x4
ISL6297CRZ* 62 97CRZ
(Note)
-20 to +70 16 Ld 4x4 QFN L16.4x4
(Pb-free)
*Add “-T” suffix for tape and reel. Please refer to TB347 for details on
reel specifications.
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.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Thermaguard is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005-2006, 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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ISL6297
Absolute Maximum Ratings
Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to 7V
All Other Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to 5.5V
Recommended Operating Conditions
Ambient Temperature Range . . . . . . . . . . . . . . . . . . .-20°C to +70°C
Supply Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3V to 6.5V
Maximum Pin Voltage (Except VIN). . . . . . . . . . . . . . . . . . . . . 5.25V
Thermal Information
Thermal Resistance (Notes 1, 2)
JA (°C/W) JC (°C/W)
4x4 QFN Package . . . . . . . . . . . . . . . .
41
4
Junction Temperature Range . . . . . . . . . . . . . . . . .-55°C to +150°C
Operating Temperature Range . . . . . . . . . . . . . . . . .-40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
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:
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 recommended operating conditions, unless otherwise noted.
PARAMETER
SYMBOL
TEST CONDITIONS
POWER-ON RESET, OVER VOLTAGE PROTECTION, PRE-REGULATOR
Rising VIN Threshold
Falling VIN Threshold
2.9V Reference Output Voltage
2.9V Reference Output Current
V2P9
ILOAD = 2mA
VIN-BAT Comparator Offset
STANDBY CURRENT
VBAT Pin Sink Current
VIN Pin Supply Current
VIN Pin Supply Current
Charger Reverse Current
ISTANDBY
IVIN1
IVIN2
VIN floating or EN pin is floating
BAT Pin floating, EN = LOW
BAT Pin floating, EN = HIGH
VIN = 4.3V, VSEN = BAT= 4.5V, EN = HIGH
VOLTAGE REGULATION
Output Voltage
Dropout Voltage
CHARGE CURRENT
VCH
VBAT = 3.7V, ICHARGE = 0.65A
Charge/Protection Current
Trickle Charge Current
End-of-Charge Current
CHARGE VOLTAGE THRESHOLDS
ICHARGE
ITRICKLE
RIREF = 80k, VBAT = 3.7V, VIN = 5V
RIREF = 80k, VBAT = 2.0V, VIN = 5V
RIMIN = 133k
Short-Circuit Threshold
Trickle Charge Threshold - Rising
Trickle Charge Threshold - Falling
Recharge Threshold - Falling
Difference from Final Battery Voltage
VSC
VMIN
VMIN
VRECHRG
Open Circuit Test Threshold- Rising
VOCR
MIN
2.9
2.3
-
-
30
-
-
-
-
4.17
-
900
85
56
0.9
2.7
2.6
3.90
-
-
TYP
3.4
2.4
2.9
-
-
-
1.0
0.5
-
4.20
250
1000
110
63
1.0
2.9
2.7
4.00
-210
4.4
MAX UNITS
4.0 V
2.65 V
-V
30 mA
- mV
3.0 A
1.5 mA
1.0 mA
6.0 A
4.23 V
300 mV
1100
135
70
mA
mA
mA
1.1 V
3.2 V
3.0 V
4.08 V
- mV
-V
2 FN9215.2
July 30, 2007

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ISL6297
Electrical Specifications Typical values are tested at VIN = 5V and +25°C ambient temperature. Maximum and minimum values are
guaranteed over recommended operating conditions, unless otherwise noted. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNITS
BATTERY TEMPERATURE MONITORING
Low Temperature Threshold
Low Temperature Hysteresis
VTMIN
V2P9 = 2.88V
1.94 2.0 2.06
135 167 199
V
mV
High Temperature Threshold
High Temperature Hysteresis
VTMAX V2P9 = 2.88V
.704 .718 .732
160 185 200
V
mV
DT Pin MOSFET On Resistance
Charge Current Foldback Threshold (Note 4)
Current Foldback Gain (Note 4)
OSCILLATOR
RDT
TFOLD
GFOLD
- 25 -
- 100 -
°C
- 100 - mA/°C
Oscillation Period
LOGIC INPUT AND OUTPUT
tOSC
CTIME = 15nF
2.7 3.0 3.3 ms
EN Input Low
- - 0.8 V
EN Pin External Pull Down to Disable
- - 50 k
LED Sink Current (RED, GRN)
Pin Voltage = 1.0V
5 10 - mA
LED Leakage Current
- - 1 A
NOTES:
3. The actual current may be lower due to the thermal foldback.
4. Limits should be considered typical and are not production tested.
3 FN9215.2
July 30, 2007

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ISL6297
Pin Description
PIN # PIN NAME
DESCRIPTION
1, 15, 16 VIN VIN is the input power source. It is recommended to have a 1resistor in series with the input decoupling capacitor to
prevent an over-shoot voltage when the input cable is plugged in.
2 GRN Open-drain LED drive pin. This pin sinks a constant-current 10mA to drive a green LED in a bi-color LED pack.
3 RED Open-drain LED drive pin. This pin sinks a constant-current 10mA to drive a red LED in a bi-color LED pack.
4 TIME Timer Programming Input. 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.
5 GND GND is the connection to system ground.
6 DT Delta Temperature Setting Input. This pin sets 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.
7 EN Enable Input. Connect EN LOW to enable the charger. Pull it HIGH or leave it floating to disable the charger. This pin is
pulled up to 2.9V when left floating.
8 V2P9 Untrimmed 2.9V 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 output is used to power the LEDs, the NTC circuit, or for other functions. The
maximum output current is 30mA. This output can also be used as an indication for adapter presence.
9 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.
10 IMIN IMIN is the programmable input for the end-of-charge current.
11 TEMP Temperature setting input. An external NTC thermistor is connected to this pin for ambient temperature sensing.
12 VSEN Battery remote voltage sensing feedback pin. This pin allows remote sense of the battery pack voltage. Connect this pin
as close as possible to the battery positive terminal with a separate trace to minimize the impact of parasitic resistance.
This pin also serves the function of compensating for voltage drop caused by the connector contact resistance.
13, 14
BAT BAT is the charger output.
- EPAD Exposed Pad. This pad is internally connected to GND. Connect as much copper as possible to this pad on the component
or other layers through thermal vias to maximize the thermal performance.
Typical Application
INPUT
Input
RIN
C1
C2
C1
D2 D1
R1
RT
RS
R2
VIN
V2P9
TEMP
DT
RED
GRN
GND
BAT
VSEN
EN
TToOBBaAtTteTrEyRY
C3
BAT+
BAT-
R3
C4
ID
TIME
IREF
IMIN
CTIME
RIREF
RIMIN
NOTE: Temperature limit components
selected for a temperature Range of -5°C
to +45°C (not charging) See Example,
page 14
C1: 1F X5R CERAMIC CAPACITOR
C3: 10F X5R CERAMIC CAPACITOR
C2, C4: 0.1F 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: 15k, 1%
R2: TBD, VALUE DEPENDENT ON THE DT (1.37kFOR +10°C delta)
RT: MURATA NCP18XH103J -- 10kAT +25°C, 5% (0603 SIZE)
RS: 41.2
R3: 10k, 5% (R3 AND C4 ARE FOR IMPROVING ESD PROTECTION)
RIN: 1(USED TO PREVENT OVERSHOOT WHEN CONNECTING THE CABLE)
4 FN9215.2
July 30, 2007

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Block Diagram
ISL6297
VIN
CR1IN
C1
IREF
RIREF
IMIN
RIMIN
TEMP
DT
Q MAIN
TETMePmEpReAraTtUuRreE
MOMNoInTiOtoRriInNgG
IT
IR
CCUuRrRreEnNt T
RERFeEfeRreEnNcCeEsS
IMIN
RREeFfEerReEnNceCsES
QSEN
100000:1
Current
Mirror
ISEN
VIN
IINnPpUuTt__OOKK
+
+
-CA
CHRG
- VPOR
++
- 50mV
V+
A-
VCH
Trickle/Fast
ISEN
TRICKLE/FAST
+
- MIN_I
V2P9
UUNnDdEeRr TTeEmMpP
NNTCC
INITnEteRrFfaAcCeE OOVEveRr-TTEeMmPp
LOGIC
+
MMIiNnBbaAtT -
VMIN
VRECHRG
+
-
RREeCcHhaArRgGe E
+
- VCONVER
BBAaTtCcoOnN
BAT
V2P9
VSEN
RED
TIME
GND
OSC
COUNTER
InINpPuUt_TO_KOK
GRN
EN
5 FN9215.2
July 30, 2007