The ISL6298 is an integrated single-cell Li-ion or Li-polymer

battery charger optimized for low current applications. The

targeted applications include mini-disk (MD) players, Blue

Tooth headsets, or other applications that use low-capacity

battery cells.

The ISL6298 is a linear charger that charges the battery in a

CC/CV (constant current/constant voltage) profile. The

charge current is programmable with an external resistor up

to 450mA during the CC phase. Once the battery voltage

reaches 4.2V (or 4.1V), the charger enters CV mode and the

charge current starts to reduce. When the charger current

drops to a user-programmable threshold, the charger

indicates the end-of-charge with a STATUS pin. The charger

does not actually terminate until a user-programmable total

fast charge time is reached. If the battery voltage drops to a

recharge threshold after termination, the charger will recharge the battery to its full capacity. The charger

preconditions the battery with 20 of the programmed CC

current if the battery voltage is below 2.8V. The total

precharge time is limited to 1/8 of the total fast charge time.

The ISL6298 features charge current thermal foldback to

guarantee safe operation when the printed circuit board is

space-limited for thermal dissipation. Additional features

include an NTC thermistor interface for monitoring the

ambient temperature, the ability to disable the time limit of

the fast charge, an FAULT indication, and a thermally

enhanced QFN or DFN package.

Features

• Complete Charger for Single-Cell Li-ion Batteries

• Integrated Pass Element and Current Sensor

• No External Blocking Diode Required

• 1 Voltage Accuracy

• Programmable Current Limit up to 450mA

• Programmable End-of-Charge Current

• Preconditioning with 20 Fast Charge Current

• 10 Accuracy at 250mA

• Charge Current Thermal Foldback

• NTC Thermistor Interface for Battery Temperature Monitor

• User Programmable Safety Timer

• Ambient Temperature Range: -20°C to 70°C

• Thermally-Enhanced QFN Packages

• Pb-Free Plus Anneal Available (RoHS Compliant)

Applications

• MD Players, Blue-Tooth Headsets and MP3 Players

• Portable Instruments

• PDAs, Cell Phones and Smart Phones

• Stand-Alone Chargers