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®
Data Sheet
ISL6255, ISL6255A
April 19, 2005
FN9203.0
Highly Integrated Battery Charger with
Automatic Power Source Selector for
Notebook Computers
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
TEMP
RANGE (°C)
PACKAGE
PKG.
DWG. #
ISL6255HRZ
(Notes 1, 2)
-10 to 100 28 Ld 5x5 QFN L28.5×5
(Pb-free)
ISL6255HAZ
(Notes 1, 2)
-10 to 100 28 Ld QSOP
(Pb-free)
M28.15
ISL6255AHRZ -10 to 100 28 Ld 5x5 QFN L28.5×5
(Notes 1, 2)
(Pb-free)
ISL6255AHAZ
(Notes 1, 2)
-10 to 100 28 Ld QSOP
(Pb-free)
M28.15
NOTES:
1. 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.
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 Available (RoHS Compliant)
Applications
• Notebook, Desknote and Sub-notebook Computers
• Personal Digital Assistant
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | 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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ISL6255, ISL6255A
Pinouts
ISL6255, ISL6255A
(28 LD QFN)
TOP VIEW
ISL6255, ISL6255A
(28 LD QSOP)
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
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
2 FN9203.0
April 19, 2005

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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-PHASE, VDD-GND, VDDP-PGND
ACPRN and DCPRN to GND . . . . . . . . . . . . . . . . . . . . -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
ACLIM, CHLIM, 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
θJA (°C/W) θJC (°C/W)
QFN Package (Notes 4, 5). . . . . . . . . .
39
9.5
QSOP Package (Note 4) . . . . . . . . . . .
80
NA
ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Level 2
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. 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.
5. For θJC, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications
PARAMETER
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.
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 43 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 1.27V
2.2 3.4 4.4 µA
ACSET Input Bias Current
ACSET < 1.27V
-1 0 1 µA
DCSET Threshold
1.24 1.26 1.28 V
3 FN9203.0
April 19, 2005

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ISL6255, ISL6255A
Electrical Specifications
PARAMETER
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)
TEST CONDITIONS
MIN
TYP
MAX
UNITS
DCSET Input Bias Current Hysteresis
2.2 3.4 4.4 µA
DCSET Input Bias Threshold
DCSET 1.27V
2.2 3.4 4.4 µA
DCSET Input Bias Current
DCSET< 1.27V
-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
Guarantee by design
-2 2 mV
Input Bias Current at CSIP & CSIN
Combined
CSIP=CSIN=25V
100 130 µA
Input Bias Current at CSIN
0 < CSIN < DCIN Guaranteed by design
0.10 1 µA
4 FN9203.0
April 19, 2005

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ISL6255, ISL6255A
Electrical Specifications
PARAMETER
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)
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 Trans-
conductance
50 µA/V
Adapter Current Error Amplifier Trans-
conductance
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 5.5 10 mV
CSIP-CSIN Threshold Hysteresis
1 2 5 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
5 FN9203.0
April 19, 2005