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DATASHEET
ISL6255, ISL6255A
Highly Integrated Battery Charger with Automatic Power Source Selector for
Notebook Computers
FN9203
Rev 2.00
May 23, 2006
The ISL6255, ISL6255A is a highly integrated battery charger
controller for Li-Ion/Li-Ion polymer batteries. High Efficiency is
achieved by a synchronous buck topology and the use of a
MOSFET, instead of a diode, for selecting power from the
adapter or battery. The low side MOSFET emulates a diode at
light loads to improve the light load efficiency and prevent
system bus boosting.
The constant output voltage can be selected for 2, 3 and 4
series Li-Ion cells with 0.5% accuracy over temperature. It can
also be programmed between 4.2V+5%/cell and 4.2V-5%/cell
to optimize battery capacity. When supplying the load and
battery charger simultaneously, the input current limit for the
AC adapter is programmable to within 3% accuracy to avoid
overloading the AC adapter, and to allow the system to make
efficient use of available adapter power for charging. It also
has a wide range of programmable charging current. The
ISL6255, ISL6255A provides outputs that are used to monitor
the current drawn from the AC adapter, and monitor for the
presence of an AC adapter. The ISL6255, ISL6255A
automatically transitions from regulating current mode to
regulating voltage mode.
ISL6255, ISL6255A has a feature for automatic power source
selection by switching to the battery when the AC adapter is
removed or switching to the AC adapter when the AC adapter
is available. It also provides a DC adapter monitor to support
aircraft power applications with the option of no battery
charging.
Ordering Information
PART
NUMBER
(Notes 1, 2)
PART
TEMP
PACKAGE PKG.
MARKING RANGE (°C) (Pb-free) DWG. #
ISL6255HRZ ISL6255HRZ -10 to 100 28 Ld 5x5 QFN L28.55
ISL6255HAZ ISL6255HAZ -10 to 100 28 Ld QSOP M28.15
ISL6255AHRZ ISL6255AHRZ -10 to 100 28 Ld 5x5 QFN L28.55
ISL6255AHAZ ISL6255AHAZ -10 to 100 28 Ld QSOP M28.15
NOTES:
1. 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.
2. Add “-T” for Tape and Reel.
Features
• ±0.5% Charge Voltage Accuracy (-10°C to 100°C)
• ±3% Accurate Input Current Limit
• ±3% Accurate Battery Charge Current Limit
• ±25% Accurate Battery Trickle Charge Current Limit
(ISL6255A)
• Programmable Charge Current Limit, Adapter Current
Limit and Charge Voltage
• Fixed 300kHz PWM Synchronous Buck Controller with
Diode Emulation at Light Load
• Output for Current Drawn from AC Adapter
• AC Adapter Present Indicator
• Fast Input Current Limit Response
• Input Voltage Range 7V to 25V
• Support 2, 3 and 4 Cells Battery Pack
• Up to 17.64V Battery-Voltage Set Point
• Control Adapter Power Source Select MOSFET
• Thermal Shutdown
• Aircraft Power Capable
• DC Adapter Present Indicator
• Battery Discharge MOSFET Control
• Less than 10µA Battery Leakage Current
• Support Pulse Charging
• Charge Any Battery Chemistry: Li-Ion, NiCd, NiMH, etc.
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• Notebook, Desknote and Sub-notebook Computers
• Personal Digital Assistant
FN9203 Rev 2.00
May 23, 2006
Page 1 of 22

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ISL6255, ISL6255A
Pinouts
ISL6255, ISL6255A
(28 LD QFN)
TOP VIEW
28 27 26 25 24 23 22
EN 1
21 CSOP
CELLS 2
20 CSIN
ICOMP 3
19 CSIP
VCOMP 4
18 SGATE
ICM 5
VREF 6
17 BGATE
16 PHASE
CHLIM 7
15 UGATE
8 9 10 11 12 13 14
ISL6255, ISL6255A
(28 LD QSOP)
TOP VIEW
DCIN
VDD
ACSET
DCSET
EN
CELLS
ICOMP
VCOMP
ICM
VREF
CHLIM
ACLIM
VADJ
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 DCPRN
27 ACPRN
26 CSON
25 CSOP
24 CSIN
23 CSIP
22 SGATE
21 BGATE
20 PHASE
19 UGATE
18 BOOT
17 VDDP
16 LGATE
15 PGND
FN9203 Rev 2.00
May 23, 2006
Page 2 of 22

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ISL6255, ISL6255A
Absolute Maximum Ratings
DCIN, CSIP, CSON to GND. . . . . . . . . . . . . . . . . . . . . -0.3V to +28V
CSIP-CSIN, CSOP-CSON . . . . . . . . . . . . . . . . . . . . . -0.3V to +0.3V
CSIP-SGATE, CSIP-BGATE . . . . . . . . . . . . . . . . . . . . . -0.3V to 16V
PHASE to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -7V to 30V
BOOT to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +35V
BOOT to VDDP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -2V to 28V
ACLIM, ACPRN, CHLIM, DCPRN, VDD to GND. . . . . . . -0.3V to 7V
BOOT-PHASE, VDDP-PGND . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V
ACSET and DCSET to GND (Note 3) . . . . . . . . -0.3V to VDD+0.3V
ICM, ICOMP, VCOMP to GND. . . . . . . . . . . . . . -0.3V to VDD+0.3V
VREF, CELLS to GND . . . . . . . . . . . . . . . . . . . . -0.3V to VDD+0.3V
EN, VADJ, PGND to GND . . . . . . . . . . . . . . . . . -0.3V to VDD+0.3V
UGATE. . . . . . . . . . . . . . . . . . . . . . . . . PHASE-0.3V to BOOT+0.3V
LGATE . . . . . . . . . . . . . . . . . . . . . . . . . . PGND-0.3V to VDDP+0.3V
Thermal Information
Thermal Resistance
JA (°C/W) JC (°C/W)
QFN Package (Notes 4, 5). . . . . . . . . .
39
9.5
QSOP Package (Note 4) . . . . . . . . . . .
80
NA
Junction Temperature Range. . . . . . . . . . . . . . . . . .-10°C to +150°C
Operating Temperature Range . . . . . . . . . . . . . . . .-10°C to +100°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
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:
3. When the voltage across ACSET and DCSET is below 0V, the current through ACSET and DCSET should be limited to less than 1mA.
4. 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.
5. For JC, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications
DCIN = CSIP = CSIN = 18V, CSOP = CSON = 12V, ACSET = DCSET = 1.5V, ACLIM = VREF,
VADJ = Floating, EN = VDD = 5V, BOOT-PHASE = 5.0V, GND = PGND = 0V, CVDD = 1µF, IVDD = 0mA,
TA = -10°C to +100°C, TJ 125°C, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
SUPPLY AND BIAS REGULATOR
DCIN Input Voltage Range
7 25 V
DCIN Quiescent Current
EN = VDD or GND, 7V DCIN 25V
1.4 3 mA
Battery Leakage Current (Note 6)
DCIN = 0, no load
3 10 µA
VDD Output Voltage/Regulation
VDD Undervoltage Lockout Trip Point
7V DCIN 25V, 0 IVDD 30mA
VDD Rising
4.925
4.0
5.075
4.4
5.225
4.6
V
V
Hysteresis
200 250 400 mV
Reference Output Voltage VREF
Battery Charge Voltage Accuracy
0 IVREF 300µA
CSON = 16.8V, CELLS = VDD, VADJ = Float
2.365
-0.5
2.39 2.415
0.5
V
%
CSON = 12.6V, CELLS = GND, VADJ = Float
-0.5
0.5 %
CSON = 8.4V, CELLS = Float, VADJ = Float
-0.5
0.5 %
CSON = 17.64V, CELLS = VDD, VADJ = VREF
-0.5
0.5 %
CSON = 13.23V, CELLS = GND, VADJ = VREF
-0.5
0.5 %
CSON = 8.82V, CELLS = Float, VADJ = VREF
-0.5
0.5 %
CSON = 15.96V, CELLS = VDD, VADJ = GND
-0.5
0.5 %
CSON = 11.97V, CELLS = GND, VADJ = GND
-0.5
0.5 %
CSON = 7.98V, CELLS = Float, VADJ = GND
-0.5
0.5 %
TRIP POINTS
ACSET Threshold
1.24 1.26 1.28 V
ACSET Input Bias Current Hysteresis
2.2 3.4 4.4 µA
ACSET Input Bias Current
ACSET 1.26V
2.2 3.4 4.4 µA
ACSET Input Bias Current
ACSET < 1.26V
-1 0 1 µA
DCSET Threshold
1.24 1.26 1.28 V
FN9203 Rev 2.00
May 23, 2006
Page 3 of 22

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ISL6255, ISL6255A
Electrical Specifications
DCIN = CSIP = CSIN = 18V, CSOP = CSON = 12V, ACSET = DCSET = 1.5V, ACLIM = VREF,
VADJ = Floating, EN = VDD = 5V, BOOT-PHASE = 5.0V, GND = PGND = 0V, CVDD = 1µF, IVDD = 0mA,
TA = -10°C to +100°C, TJ 125°C, unless otherwise noted. (Continued)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
DCSET Input Bias Current Hysteresis
2.2 3.4 4.4 µA
DCSET Input Bias Current
DCSET 1.26V
2.2 3.4 4.4 µA
DCSET Input Bias Current
DCSET < 1.26V
-1 0 1 µA
OSCILLATOR
Frequency
245 300 355 kHz
PWM Ramp Voltage (peak-peak)
CSIP = 18V
1.6 V
CSIP = 11V
1V
SYNCHRONOUS BUCK REGULATOR
Maximum Duty Cycle
97 99 99.6 %
UGATE Pull-Up Resistance
BOOT-PHASE = 5V, 500mA source current
1.8 3.0
UGATE Source Current
BOOT-PHASE = 5V, BOOT-UGATE = 2.5V
1.0 A
UGATE Pull-down Resistance
BOOT-PHASE = 5V, 500mA sink current
1.0 1.8
UGATE Sink Current
BOOT-PHASE = 5V, UGATE-PHASE = 2.5V 1.8 A
LGATE Pull-Up Resistance
VDDP-PGND = 5V, 500mA source current
1.8 3.0
LGATE Source Current
VDDP-PGND = 5V, VDDP-LGATE = 2.5V
1.0 A
LGATE Pull-Down Resistance
VDDP-PGND = 5V, 500mA sink current
1.0 1.8
LGATE Sink Current
VDDP-PGND = 5V, LGATE = 2.5V
1.8 A
CHARGING CURRENT SENSING AMPLIFIER
Input Common-Mode Range
0 18 V
Input Offset Voltage
Guaranteed by design
-2.5 0 2.5 mV
Input Bias Current at CSOP
0 < CSOP < 18V
0.25 2 µA
Input Bias Current at CSON
0 < CSON < 18V
75 100 µA
CHLIM Input Voltage Range
0 3.6 V
CSOP to CSON Full-Scale Current Sense
Voltage
ISL6255: CHLIM = 3.3V
ISL6255A: CHLIM = 3.3V
157 165 173 mV
160 165 170 mV
ISL6255: CHLIM = 2.0V
95 100 105 mV
ISL6255A: CHLIM = 2.0V
97 100 103 mV
ISL6255: CHLIM = 0.2V
5.0 10 15.0 mV
ISL6255A: CHLIM = 0.2V
7.5 10 12.5 mV
CHLIM Input Bias Current
CHLIM = GND or 3.3V, DCIN = 0V
-1
1 µA
CHLIM Power-Down Mode Threshold
Voltage
CHLIM rising
80 88 95 mV
CHLIM Power-Down Mode Hysteresis
Voltage
15 25 40 mV
ADAPTER CURRENT SENSING AMPLIFIER
Input Common-Mode Range
7 25 V
Input Offset Voltage
Guaranteed by design
-2 2 mV
Input Bias Current at CSIP and CSIN
Combined
CSIP = CSIN = 25V
100 130 µA
Input Bias Current at CSIN
0 < CSIN < DCIN, Guaranteed by design
0.10 1 µA
FN9203 Rev 2.00
May 23, 2006
Page 4 of 22

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ISL6255, ISL6255A
Electrical Specifications
DCIN = CSIP = CSIN = 18V, CSOP = CSON = 12V, ACSET = DCSET = 1.5V, ACLIM = VREF,
VADJ = Floating, EN = VDD = 5V, BOOT-PHASE = 5.0V, GND = PGND = 0V, CVDD = 1µF, IVDD = 0mA,
TA = -10°C to +100°C, TJ 125°C, unless otherwise noted. (Continued)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
ADAPTER CURRENT LIMIT THRESHOLD
CSIP to CSIN Full-Scale Current Sense
Voltage
ACLIM = VREF
ACLIM = Float
97 100 103 mV
72 75 78 mV
ACLIM = GND
47 50 53 mV
ACLIM Input Bias Current
ACLIM = VREF
10 16 20 µA
ACLIM = GND
-20 -16 -10 µA
VOLTAGE REGULATION ERROR AMPLIFIER
Error Amplifier Transconductance from
CSON to VCOMP
CELLS = VDD
30 µA/V
CURRENT REGULATION ERROR AMPLIFIER
Charging Current Error Amplifier
Transconductance
50 µA/V
Adapter Current Error Amplifier
Transconductance
50 µA/V
BATTERY CELL SELECTOR
CELLS Input Voltage for 4 Cell Select
4.3 V
CELLS Input Voltage for 3 Cell Select
2V
CELLS Input Voltage for 2 Cell Select
2.1 4.2 V
MOSFET DRIVER
BGATE Pull-Up Current
CSIP-BGATE = 3V
10 30 45 mA
BGATE Pull-Down Current
CSIP-BGATE = 5V
2.7 4.0 5.0 mA
CSIP-BGATE Voltage High
8 9.6 11 V
CSIP-BGATE Voltage Low
50 0 50 mV
DCIN-CSON Threshold for CSIP-BGATE
Going High
DCIN = 12V, CSON Rising
-100 0 100 mV
DCIN-CSON Threshold Hysteresis
250 300 400 mV
SGATE Pull-Up Current
CSIP-SGATE = 3V
7 12 15 mA
SGATE Pull-Down Current
CSIP-SGATE = 5V
50 160 370 µA
CSIP-SGATE Voltage High
8 9 11 V
CSIP-SGATE Voltage Low
-50 0 50 mV
CSIP-CSIN Threshold for CSIP-SGATE
Going High
2.5 8 13 mV
CSIP-CSIN Threshold Hysteresis
1.3 5 8 mV
LOGIC INTERFACE
EN Input Voltage Range
0
VDD
V
EN Threshold Voltage
Rising
1.030
1.06 1.100
V
Falling
0.985
1.000
1.025
V
Hysteresis
30 60 90 mV
EN Input Bias Current
EN = 2.5V
1.8 2.0 2.2 µA
ACPRN Sink Current
ACPRN = 0.4V
3 8 11 mA
ACPRN Leakage Current
ACPRN = 5V
-0.5 0.5 µA
DCPRN Sink Current
DCPRN = 0.4V
3 8 11 mA
FN9203 Rev 2.00
May 23, 2006
Page 5 of 22