Highly Integrated Battery Charger for Notebook Computers

The ISL6253 is a highly integrated battery charger controller for Li-Ion/Li-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.

Features

• ±0.5 Voltage Accuracy

• ±3 Input Current Limit Accuracy

• ±4 Accurate Battery Charge Current Limit

• Programmable Charge Limit Current, Adaptor Current Limit and Charge Voltage

• Fixed 300kHz PWM Synchronous Buck Controller with Diode Emulation at Light Load

• Output for Current Drawn from the AC Adapter

• AC Adapter Present Indicator

• Fast Input Current Limit Response

• Input Voltage Range 7V to 25V

• Up to 17.6V Battery-Voltage Set Point

• Trickle Charge Mode When Battery Voltage is below 3.0V/Cell

• Supports 2, 3 and 4 Cell Battery Packs

• 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

• QFN Package

- Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Package Outline

- Near Chip Scale Package footprint, which improves PCB efficiency and has a thinner profile

• Pb-free Available

Applications

• Notebook, Desknote and Sub-notebook Computers

• Personal Digital Assistants