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ISL6294A
FN6821.2
High Input Voltage Charger
Features
The ISL6294A 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
7.3V, to prevent excessive power dissipation. The 28V rating
eliminates the overvoltage protection circuit required in a low
input voltage charger.
• 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
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.
• 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
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.
• Ambient Temperature Range: -40°C to +85°C
• 8 Ld 2x3 DFN Package
• Pb-Free (RoHS Compliant)
Ordering Information
PART
NUMBER
(Note)
PART
MARKING
TEMP.
RANGE
(°C)
PACKAGE PKG.
(Pb-Free) DWG. #
ISL6294AIRZ-T* 94A
-40 to +85 8 Ld 2x3 DFN L8.2x3
*Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets, molding compounds/die attach
materials, and 100% matte tin plate plus anneal (e3 termination finish,
which is 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.
Applications
• Mobile Phones
• Blue-Tooth Devices
• PDAs
• MP3 Players
• Stand-Alone Chargers
• Other Handheld Devices
Pinout
ISL6294A
(8 LD DFN)
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 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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ISL6294A
Absolute Maximum Ratings (Reference to GND)
VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 30V
IMIN, IREF, BAT, CHG, EN, PPR . . . . . . . . . . . . . . . . . . . -0.3V to 7V
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 900mA
Thermal Information
Thermal Resistance
JA (°C/W) JC (°C/W)
DFN Package (Notes 1, 2) . . . . . . . . . .
59
4.5
Maximum Junction Temperature (Plastic Package) . . . . . . . +150°C
Maximum 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. For JC, 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 TA at +25°C.
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
2.7 3.4 3.6
V
V
Rising Edge
Falling Edge
OVERVOLTAGE PROTECTION
VOS
VOS
VBAT = 4.0V, use CHG pin to indicate the
comparator output (Note 3)
- 90 150 mV
10 50
- mV
Overvoltage Protection Threshold
OVP Threshold Hysteresis
VOVP
(Note 4)
Use PPR to indicate the comparator output
6.9 7.3 7.7
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
VBAT = 4.2V
Charger disabled
Charger enabled
- - 1.0 µA
-
350 600
µA
-
500 800
µA
Output Voltage
PMOS ON-Resistance
CHARGE CURRENT (Note 5)
VCH
rDS(ON)
Charge current = 20mA
VIN = 4.1V, charge current = 0.3A
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
VIN = 5V, RIREF = 24.3k, VBAT = 2.8V to 4.0V
VIN = 5V, RIREF = 24.3k, VBAT = 2.4V
VIN = 5V, RIMIN = 243k
VIN = 5V, RIMIN = 243k
1.18
450
70
33
325
1.22
500
95
45
380
1.26
550
130
57
415
V
mA
mA
mA
mA
Preconditioning Charge Threshold Voltage VMIN
Preconditioning Voltage Hysteresis
VMINHYS
INTERNAL TEMPERATURE MONITORING
2.45 2.55 2.65
- 250 -
V
mV
Charge Current Foldback Threshold
(Note 6)
TFOLD
100 115 130
°C
2 FN6821.2
December 11, 2008

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ISL6294A
Electrical Specifications Typical Values Are Tested at VIN = 5V and the TA at +25°C. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP MAX UNITS
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. Limits should be considered typical and are not production 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 of 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 minimum 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
Equation 1:
IMIN = -R1---1-I--M0----0-I--N0--
mA
(EQ. 1)
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 Equation 2:
IREF = -R1---2-I--R-0---8E---9-F--
mA
(EQ. 2)
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.
3 FN6821.2
December 11, 2008

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Typical Applications
ISL6294A
TO INPUT
C1
VIN BAT
RIREF
IREF
ISL6294A
IMIN
RIMIN
TO BATTERY
R1 R2
D1 D2
C2
OFF
ON
EN
CHG
PPR
GND
FIGURE 1. TYPICAL APPLICATION CIRCUIT INTERFACING TO INDICATION LEDs
TABLE 1. COMPONENT DESCRIPTION FOR FIGURE 1
PART
DESCRIPTION
C1
C2
RIREF
RIMIN
R1, R2
D1, D2
1µF X5R ceramic capacitor
1µF X5R ceramic capacitor
24.3k, 1%, for 500mA charge current
243k, 1%, for 45mA EOC current
300, 5%
LEDs for indication
TABLE 2. COMPONENT DESCRIPTION FOR FIGURE 2
PART
DESCRIPTION
C1
C2
RIREF
RIMIN
R1, R2
1µF X5R ceramic capacitor
1µF X5R ceramic capacitor
24.3k, 1%, for 500mA charge current
243k, 1%, for 45mA EOC current
100k, 5%
TO INPUT
C1
OFF
ON
VIN
EN
GND
ISL6294A
BAT
IREF
IMIN
RIREF
RIMIN
CHG
PPR
R1
TO BATTERY
C2
VCC
R2
FIGURE 2. TYPICAL APPLICATION CIRCUIT WITH THE INDICATION SIGNALS INTERFACING TO A MCU
4 FN6821.2
December 11, 2008

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ISL6294A
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 ISL6294A 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 ISL6294A 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 FN6821.2
December 11, 2008