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®
Data Sheet
ISL6256, ISL6256A
September 14, 2010
FN6499.3
Highly Integrated Battery Charger with
Automatic Power Source Selector for
Notebook Computers
The ISL6256, ISL6256A 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 ISL6256, ISL6256A provides outputs
that are used to monitor the current drawn from the AC
adapter, and monitor for the presence of an AC adapter. The
ISL6256, ISL6256A automatically transitions from regulating
current mode to regulating voltage mode.
ISL6256, ISL6256A 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
MARKING
TEMP
RANGE
(°C)
PACKAGE PKG.
(Pb-free) DWG. #
ISL6256HRZ ISL 6256HRZ -10 to +100 28 Ld 5x5 QFN L28.5x5
ISL6256HAZ ISL 6256HAZ -10 to +100 28 Ld QSOP M28.15
ISL6256AHRZ ISL6256 AHRZ -10 to +100 28 Ld 5x5 QFN L28.5x5
ISL6256AHAZ ISL6256 AHAZ -10 to +100 28 Ld QSOP M28.15
NOTES:
1. Add “-T” suffix for tape and reel. Please refer to TB347 for details on
reel specifications.
2. 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.
3. For Moisture Sensitivity Level (MSL), please see device information
page for ISL6256, ISL6256A. For more information on MSL please
see techbrief TB363.
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
• Programmable Charge Current Limit, Adapter Current
Limit and Charge Voltage
• Fixed 300kHz PWM Synchronous Buck Controller with
Diode Emulation at Light Load
• Overvoltage Protection
• 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
http://www.DataSheet4U.net/
• Aircraft Power Capable
• DC Adapter Present Indicator
• Battery Discharge MOSFET Control
• Less than 10µA Battery Leakage Current
• Supports Pulse Charging
• Pb-free (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 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2007, 2008, 2010. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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ISL6256, ISL6256A
Pinouts
ISL6256, ISL6256A
(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
ICM 5
VREF 6
18 SGATE
17 BGATE
16 PHASE
CHLIM 7
15 UGATE
8 9 10 11 12 13 14
ISL6256, ISL6256A
(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
http://www.DataSheet4U.net/
2 FN6499.3
September 14, 2010

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ISL6256, ISL6256A
ACSET
ACPRN
ACLIM
ICOMP
VCOMP
VADJ
CELLS
VREF
ICM
+
- 1.26V
SGATE CSIP CSIN
+-
X19.9
CA1
+
1.26V -
DCSET
DCPRN
VREF
152kΩ
152kΩ
ADAPTER
CURRENT
LIMIT SET
-
gm3
+
MIN
CURRENT
BUFFER
MIN
VOLTAGE
BUFFER
Σ
CSON
-
+
LDO
REGULATOR
300kHz
RAMP
-
PWM
+
BGATE
DCIN
VDD
BOOT
UGATE
PHASE
VREF
514kΩ
514kΩ
gm1
-
2.1V
VOLTAGE
SELECTOR
VDD
REFERENCE
-0.25
288kΩ
32kΩ
16kΩ
48kΩ
gm2
-
CA2
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X19.9
-+
VDDP
LGATE
PGND
1.065V
-
+
EN
GND
FB CSON CSOP CHLIM
FIGURE 1. FUNCTIONAL BLOCK DIAGRAM
3 FN6499.3
September 14, 2010

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ISL6256, ISL6256A
AC ADAPTER
Q3
R8
130k
1%
VDD Q5 C8
R9
10.2k
1%
TO HOST
CONTROLLER
C8
0.1µF DDCCININ
SGATE
ACASCESTET
CCSSIIPP
C7
1µF
3.3V
R5
100k
C6 6.8nF
R10
4.7Ω
C9
1µF
IISSLL66225566
ISIISSLL6256A
VDVDDPP
CCSSIINN
BBGGAATTEE
VDVDD
BBOOOOTT
ACAPCRPNRN
ICICOOMMPP
UUGGAATTEE
PPHHAASSEE
R21 2.2Ω
C2
0.1µF
R2
20mΩ
R22 22Ω
VDDP C1:10µF
D2
C4
0.1µF
Q1
R6 C5 10nF
4.7k FLOATING
4.2V/CELL
CHARGE
ENABLE
VCVOCOMMP P
VAVADDJ J
LLGGAATTEE
PPGGNNDD
EENN
CCSSOOPP
ACACLILMIM
CCSSOONN
D1
Q2 OPTIONAL
R11 22Ω
C3
0.047µF
VREF
VRVREFEF
R12 2.6A CHARGE LIMIT
20k 1% 253mA TRICKLE CHARGE
R13 R11
CHCHLILMIM
1.87k 130k
TRICKLE 1%
1%
CHARGE
Q6
CCEELLLLSS
R12 22Ω
VDD
4 CELLS
IICCMM
R7: 100Ω
GGNNDD
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C11
3300pF
Q4
L
4.7µH
R1
20mΩ
C10
22µF
SYSTEM LOAD
VDD
R23
10k
D3
1N914
CSON
BAT+
BATTERY
PACK
BAT-
FIGURE 2. ISL6256, ISL6256A TYPICAL APPLICATION CIRCUIT WITH FIXED CHARGING PARAMETERS
4 FN6499.3
September 14, 2010

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ISL6256, ISL6256A
ADAPTER
R14
100k
1%
R8
130k
1%
R9
10.2k
1%
Q5
VDD
Q3
C8
0.1µ
DDCCININ
AACCSSEETT
SGSAGTAETE
CCSSIPIP
R15
11.5k
1%
C7
1µF
VCC
DIGITAL
INPUT
DIGITAL
INPUT
R16
100k
C9
1µF
R5
100k
R10
4.7Ω
DDCCSSEETT
ISLISLISL6256 CCSSININ
ISL6256A
ISISLL
VVDDDDPP
BGBAGTAETE
VVDDDD
BBOOOOTT
UGUAGTAETE
AACCPPRRNN
PHPAHSAESE
DDCCPPRRNN
LGLGATAETE
D/A OUTPUT
CCHHLLIMIM
PGPGNDND
OUTPUT
A/D INPUT
HOST
AVDD/VREF
SCL
SDL
A/D INPUT
GND
R7: 100Ω
EENN
C11
3300pF
VREF
5.15A INPUT
CURRENT LIMIT
ICICMM
AACCLLIMIM
R11, R12
R13: 10k
C6
6.8nF
VVRREEFF
ICICOOMMPP
R6
4.7k
VVCCOOMMPP
C5
10nF
CCSOSOPP
CSCOSONN
CCEELLSLS
VAVADDJJ
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GGNNDD
R21 2.2Ω
C2
0.1µF
R2
20mΩ
SYSTEM LOAD
R22 22Ω
VDDP
D2
C4
0.1µF
C1:10µF
Q1
Q4
Q2
D1
OPTIONAL
L
4.7µH
VDD
R23
10k
D3
1N914
R11 22Ω
C3
0.047µF
R1
20mΩ
GND R12 22Ω
3 CELLS
FLOATING
4.2V/CELL
C10
22µF
CSON
BAT+
BATTERY
PACK
SCL
SDL
TEMP
BAT-
FIGURE 3. ISL6256, ISL6256A TYPICAL APPLICATION CIRCUIT WITH µP CONTROL AND AIRCRAFT POWER SUPPORT
5 FN6499.3
September 14, 2010