1

®

FN6499.1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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ISL6256, ISL6256A

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.

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

• Aircraft Power Capable

• DC Adapter Present Indicator

• Battery Discharge MOSFET Control

• Less than 10µA Battery Leakage Current

• Supports Pulse Charging

• Pb-Free Plus Anneal Available (RoHS Compliant)

Applications

• Notebook, Desknote and Sub-notebook Computers

• Personal Digital Assistant

Ordering Information

PART

NUMBER

(Notes 1, 2)

PART

MARKING

TEMP

RANGE

(°C)

PACKAGE

(Pb-free)

PKG.

DWG. #

ISL6256HRZ*

ISL 6256HRZ

-10 to +100 28 Ld 5x5 QFN L28.5

×5

ISL6256HAZ*

ISL 6256HAZ

-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.

Data Sheet

July 19, 2007