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Data Sheet
February 18, 2005
ISL6294
FN9174.0
High Input Voltage Charger
The ISL6294 is a cost-effective, fully integrated high input
voltage single-cell Li-ion battery charger. The charger uses a
CC/CV charge profile required by Li-ion batteries. The
charger accepts an input voltage up to 28V but is disabled
when the input voltage exceeds the OVP threshold, typically
6.8V, to prevent excessive power dissipation. The 28V rating
eliminates the overvoltage protection circuit required in a low
input voltage charger.
The charge current and the end-of-charge (EOC) current are
programmable with external resistors. When the battery
voltage is lower than typically 2.55V, the charger
preconditions the battery with typically 20% of the
programmed charge current. When the charge current
reduces to the programmable EOC current level during the
CV charge phase, an EOC indication is provided by the CHG
pin, which is an open-drain output. An internal thermal
foldback function protects the charger from any thermal
failure.
Two indication pins (PPR and CHG) allow simple interface to
a microprocessor or LEDs. When no adapter is attached or
when disabled, the charger draws less than 1µA leakage
current from the battery.
Ordering Information
PART
NUMBER
TEMP.
RANGE (°C)
PACKAGE
PKG.
DWG. #
ISL6294IRZ (Note)
-40 to 85 8 Ld 2x3 DFN
(Pb-free)
L8.2x3
ISL6294IRZ-T (Note) -40 to 85 8 Ld 2x3 DFN
(Pb-free)
L8.2x3
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.
Features
• Complete Charger for Single-Cell Li-ion/Polymer Batteries
• Integrated Pass Element and Current Sensor
• No External Blocking Diode Required
• Low Component Count and Cost
• 1% Voltage Accuracy
• Programmable Charge Current
• Programmable End-of-Charge Current
• Charge Current Thermal Foldback for Thermal
Protection
• Trickle Charge for Fully Discharged Batteries
• 28V Maximum Voltage for the Power Input
• Power Presence and Charge Indications
• Less Than 1µA Leakage Current off the Battery When No
Input Power Attached or Charger Disabled
• Ambient Temperature Range: -40°C to 85°C
• 2x3 DFN-8 Packages
• Pb-Free Available (RoHS Compliant)
Applications
• Mobile Phones
• Blue-Tooth Devices
• PDAs
• MP3 Players
• Stand-Alone Chargers
• Other Handheld Devices
Pinout
DFN 8 LEAD
TOP VIEW
VIN 1
PPR 2
CHG 3
EN 4
8 BAT
7 IREF
6 IMIN
5 GND
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. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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ISL6294
Absolute Maximum Ratings (Reference to GND)
VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 30V
IMIN, IREF, BAT, CHG, EN, PPR . . . . . . . . . . . . . . . . . . . -0.3V to 7V
ESD Rating
Human Body Model (Per EIA JESD22 Method A114-B) . . . . .3kV
Machine Model (Per EIA JED-4701 Method C-111) . . . . . . . .200V
Recommended Operating Conditions
Ambient Temperature Range . . . . . . . . . . . . . . . . . . . .-40°C to 85°C
Maximum Supply Voltage (VIN Pin). . . . . . . . . . . . . . . . . . . . . . 28V
Operating Supply Voltage (VIN Pin). . . . . . . . . . . . . . . . 4.5V to 6.5V
Programmed Charge Current . . . . . . . . . . . . . . . . 100mA to 700mA
Thermal Information
Thermal Resistance
θJA (°C/W) θJC (°C/W)
DFN Package (Notes 1, 2) . . . . . . . . . .
78
11
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. 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. For θJC, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications
Typical Values Are Tested at VIN = 5V and the Ambient Temperature at 25°C. All Maximum and Minimum
Values Are Guaranteed Under the Recommended Operating Supply Voltage Range and Ambient Temperature
Range, Unless Otherwise Noted.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNITS
POWER-ON RESET
Rising POR Threshold
Falling POR Threshold
VIN-BAT OFFSET VOLTAGE
VPOR
VPOR
VBAT = 3.0V, use PPR to indicate the
comparator output.
3.3 3.9 4.3
V
3.1 3.6 4.15 V
Rising Edge
Falling Edge
OVER VOLTAGE PROTECTION
VOS
VOS
VBAT = 4.0V, use CHG pin to indicate the
comparator output (Note 3)
- 90 150 mV
10 50
- mV
Over Voltage Protection Threshold
OVP Threshold Hysteresis
VOVP
(Note 4)
Use PPR to indicate the comparator output
6.5 6.8 7.1
V
100 240 400 mV
STANDBY CURRENT
BAT Pin Sink Current
VIN Pin Supply Current
VIN Pin Supply Current
VOLTAGE REGULATION
ISTANDBY
IVIN
IVIN
Charger disabled or the input is floating
Charger disabled
Charger enabled
- - 1.0 µA
-
300 400
µA
-
400 600
µA
Output Voltage
PMOS On Resistance
CHARGE CURRENT (Note 5)
VCH
rDS(ON)
4.3V < VIN < 6.5V, charge current = 20mA
VBAT = 3.8V, charge current = 0.5A
4.158 4.20 4.242
- 0.6 -
V
IREF Pin Output Voltage
Constant Charge Current
Trickle Charge Current
End-of-Charge Current
EOC Rising Threshold
IIREF
ICHG
ITRK
IMIN
PRECONDITIONING CHARGE THRESHOLD
VBAT = 3.8V
RIREF = 24.3k, VBAT = 2.8V - 4.0V
RIREF = 24.3k, VBAT = 2.4V
RIMIN = 243k
RIMIN = 243k
1.18 1.22 1.26
450 500 550
70 95 130
33 45 57
325 380 415
V
mA
mA
mA
mA
Preconditioning Charge Threshold Voltage VMIN
Preconditioning Voltage Hysteresis
VMINHYS
2.45 2.55 2.65
40 100 150
V
mV
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ISL6294
Electrical Specifications
Typical Values Are Tested at VIN = 5V and the Ambient Temperature at 25°C. All Maximum and Minimum
Values Are Guaranteed Under the Recommended Operating Supply Voltage Range and Ambient Temperature
Range, Unless Otherwise Noted. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNITS
INTERNAL TEMPERATURE MONITORING
Charge Current Foldback Threshold
(Note 6)
TFOLD
100 115 130
°C
LOGIC INPUT AND OUTPUTS
EN Pin Logic Input High
1.3 -
-V
EN Pin Logic Input Low
- - 0.5 V
EN Pin Internal Pull Down Resistance
100 200 400 k
CHG Sink Current when LOW
Pin Voltage = 1V
10 20
- mA
CHG Leakage Current When HIGH
PPR Sink Current when LOW
VCHG = 6.5V
Pin Voltage = 1V
--
10 20
1 µA
- mA
PPR Leakage Current When HIGH
VPPR 6= 6.5V
- - 1 µA
NOTES:
3. The 4.0V VBAT is selected so that the CHG output can be used as the indication for the offset comparator output indication. If the VBAT is lower
than the POR threshold, no output pin can be used for indication.
4. For junction temperature below 100 °C.
5. The charge current can be affected by the thermal foldback function if the IC under the test setup cannot dissipate the heat.
6. This parameter is guaranteed by design, not tested.
Pin Descriptions
VIN - Power input. The absolute maximum input voltage is
28V. A 0.47µF or larger value X5R ceramic capacitor is
recommended to be placed very close to the input pin for
decoupling purpose. Additional capacitance may be required
to provide a stable input voltage.
PPR - Open-drain power presence indication. The open-
drain MOSFET turns on when the input voltage is above the
POR threshold but below the OVP threshold and off
otherwise. This pin is capable to sink 10mA (minimum)
current to drive an LED. The maximum voltage rating for this
pin is 7V. This pin is independent on the EN-pin input.
CHG - Open-drain charge indication pin. This pin outputs a
logic LOW when a charge cycle starts and turns to HIGH
when the end-of-charge (EOC) condition is qualified. This
pin is capable to sink 10mA min. current to drive an LED.
When the charger is disabled, the CHG outputs high
impedance.
EN - Enable input. This is a logic input pin to disable or
enable the charger. Drive to HIGH to disable the charger.
When this pin is driven to LOW or left floating, the charger is
enabled. This pin has an internal 200kpull-down resistor.
GND - System ground.
IMIN - End-of-charge (EOC) current program pin. Connect a
resistor between this pin and the GND pin to set the EOC
current. The EOC current IMIN can be programmed by the
following equation:
IMIN = -R1---1-I--M0----0-I--N0--
(mA)
Where RIMIN is in k. The programmable range covers 5%
(or 10mA, whichever is higher) to 50% of IREF. When
programmed to less than 5% or 10mA, the stability is not
guaranteed.
IREF - Charge-current program and monitoring pin. Connect
a resistor between this pin and the GND pin to set the
charge current limit determined by the following equation:
IREF = -R1---2-I--R-0---8E---9-F--
(mA)
Where RIREF is in k. The IREF pin voltage also monitors
the actual charge current during the entire charge cycle,
including the trickle, constant-current, and constant-voltage
phases. When disabled, VIREF = 0V.
BAT - Charger output pin. Connect this pin to the battery. A
1µF or larger X5R ceramic capacitor is recommended for
decoupling and stability purposes. When the EN pin is pulled
to logic HIGH, the BAT output is disabled.
EPAD - Exposed pad. Connect as much as possible copper
to this pad either on the component layer or other layers
through thermal vias to enhance the thermal performance.
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Typical Applications
ISL6294
TO INPUT
C1
VIN
ISL6294
BAT
IREF
IMIN
RIREF
RIMIN
TO BATTERY
R1 R2
D1 D2
C2
OFF
ON
EN
CHG
PPR
GND
FIGURE 1. TYPICAL APPLICATION CIRCUIT INTERFACING TO INDICATION LEDs
COMPONENT DESCRIPTION FOR FIGURE 1
PART
DESCRIPTION
C1
C2
RIREF
RIMIN
R1, R2
D1, D2
1µF X5R ceramic cap
1µF X5R ceramic cap
24.3k, 1%, for 500mA charge current
243k, 1%, for 45mA EOC current
300, 5%
LEDs for indication
COMPONENT DESCRIPTION FOR FIGURE 2
PART
DESCRIPTION
C1
C2
RIREF
RIMIN
R1, R2
1µF X5R ceramic cap
1µF X5R ceramic cap
24.3k, 1%, for 500mA charge current
243k, 1%, for 45mA EOC current
100k, 5%
TO INPUT
C1
OFF
ON
VIN
EN
GND
ISL6294
BAT
IREF
IMIN
RIREF
RIMIN
TO BATTERY
C2
VCC
CHG
PPR
R1 R2
FIGURE 2. TYPICAL APPLICATION CIRCUIT WITH THE INDICATION SIGNALS INTERFACING TO A MCU
4 FN9174.0
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ISL6294
VIN
PPR
POR
EN
GND
PRE
REG
VOS
VREF
VCC
BAT
200K
CHARGE
CONTROL
EN
VREF
VCC
DIE
TEMP
115°C
BAT
CHG
IMIN
FIGURE 3. BLOCK DIAGRAM
IREF
4.2V
IREF
TRICKLE
CC
2.55V
19%IREF
CV
CHARGE
VOLTAGE
CHARGE
CURRENT
IMIN
76%I REF
CHG
CHG
INDICATION
FIGURE 4. TYPICAL CHARGE PROFILE
TIME
Description
The ISL6294 charges a Li-ion battery using a CC/CV profile.
The constant current IREF is set with the external resistor
RIREF (See Figure 1) and the constant voltage is fixed at
4.2V. If the battery voltage is below a typical 2.55V trickle-
charge threshold, the ISL6294 charges the battery with a
trickle current of 19% of IREF until the battery voltage rises
above the trickle charge threshold. Fast charge CC mode is
maintained at the rate determined by programming IREF until
the cell voltage rises to 4.2V. When the battery voltage
reaches 4.2V, the charger enters a CV mode and regulates
the battery voltage at 4.2V to fully charge the battery without
the risk of over charge. Upon reaching an end-of-charge
(EOC) current, the charger indicates the charge completion
with the CHG pin, but the charger continues to output the
4.2V voltage. Figure 4 shows the typical charge waveforms
after the power is on.
The EOC current level IMIN is programmable with the
external resistor RIMIN (See Figure 1). The CHG signal turns
5 FN9174.0
February 18, 2005