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ISL6251

Low Cost Multi-Chemistry Battery Charger Controller

Renesas Electronics 

DATASHEET

ISL6251, ISL6251A

Low Cost Multi-Chemistry Battery Charger Controller

FN9202

Rev 3.00

March 13, 2014

The ISL6251, ISL6251A is a highly integrated battery charger

controller for Li-Ion/Li-Ion polymer batteries and NiMH

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

be also 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

ISL6251, ISL6251A provides outputs that are used to monitor

the current drawn from the AC adapter, and monitor for the

presence of an AC adapter. The ISL6251, ISL6251A

automatically transitions from regulating current mode to

regulating voltage mode.

Ordering Information

PART NUMBER PART

(Notes 1, 2, 3) MARKING

TEMP

RANGE

(°C)

PACKAGE PKG.

(Pb-Free) DWG. #

ISL6251HRZ ISL 6251HRZ -10 to +100 28 Ld 5x5 QFN L28.55

ISL6251HAZ ISL 6251HAZ -10 to +100 24 Ld QSOP M24.15

ISL6251AHRZ ISL6251 AHRZ -10 to +100 28 Ld 5x5 QFN L28.55

ISL6251AHAZ ISL6251 AHAZ -10 to +100 24 Ld QSOP M24.15

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 ISL6251, ISL6251A. 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

(ISL6251A)

• 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

• Supports 2, 3 and 4 Cells Battery Pack

• Up to 17.64V Battery-Voltage Set Point

• Thermal Shutdown

• Support Pulse Charging

• Less than 10µA Battery Leakage Current

• Charge Any Battery Chemistry: Li-Ion, NiCd, NiMH, etc.

• Pb-Free (RoHS Compliant)

Applications

• Notebook, Desknote and Sub-notebook Computers

• Personal Digital Assistant

FN9202 Rev 3.00

March 13, 2014

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