ISL6256, ISL6256A
®
Data Sheet
July 19, 2007
FN6499.1
Highly Integrated Battery Charger with
Automatic Power Source Selector for
Notebook Computers
Features
• ±0.5% Charge Voltage Accuracy (-10°C to +100°C)
• ±3% Accurate Input Current Limit
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.
• ±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
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.
• 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
• Aircraft Power Capable
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.
• DC Adapter Present Indicator
• Battery Discharge MOSFET Control
• Less than 10µA Battery Leakage Current
• Supports Pulse Charging
• Pb-Free Plus Anneal Available (RoHS Compliant)
Ordering Information
PART
NUMBER
(Notes 1, 2)
TEMP
RANGE
(°C)
Applications
PART
MARKING
PACKAGE
(Pb-free)
PKG.
DWG. #
• Notebook, Desknote and Sub-notebook Computers
• Personal Digital Assistant
ISL6256HRZ* ISL 6256HRZ
ISL6256HAZ* ISL 6256HAZ
-10 to +100 28 Ld 5x5 QFN L28.5×5
-10 to +100 28 Ld QSOP M28.15
ISL6256AHRZ* ISL6256 AHRZ -10 to +100 28 Ld 5x5 QFN L28.5×5
ISL6256AHAZ* ISL6256 AHAZ -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. Please refer to TB347 for details on reel
specifications.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright Intersil Americas Inc. 2007. All Rights Reserved
1
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