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Switching Charger for 1-Cell Li-ion Batteries

ISL9220B

The ISL9220B is a cost-effective and versatile battery

charger for 1-cell Li-Polymer based portable applications.

The device features synchronous PWM technology,

maximizing power efficiency, thus minimizing charge

time and heat. The 1.2MHz switching frequency allows

use of small external inductors and capacitors.

A simple charge current programming method is

provided. External resistors program the fast charge and

end-of-charge currents.

The two status outputs can be used to drive LEDs, or can

be connected to the host processor.

A programmable charge timer provides the ability to

detect defective batteries, and provides a secondary

method of detecting charge termination.

A thermistor interface is provided for battery presence

detection, and for temperature qualified charging

conditions.

Additional features include preconditioning of an

over-discharged battery, automatic recharge, and

thermally enhanced QFN package.

Applications

• PDAs and Smart Phones

• MP3 and Portable Media Players

• Handheld GPS Devices

• Digital Still Cameras

• Industrial Handheld Scanners

Features

• Highly Integrated Battery Charger IC

• Charges 1 Li-ion or Li-Polymer Batteries

• Up to 2A Charge Current

• Synchronous Buck Topology, with Integrated Power

FETs

• 1.2MHz Switching Frequency

• 0.5% Charge Voltage Accuracy

• Input Current Limit Programmable with One External

Resistor

• Thermistor Interface for Battery Detection and

Temperature Qualified Charging

• Two Status Outputs

• Programmable Charge Safety Timer

• Short-Circuit and Thermal Protection

• Small 4x4mm TQFN Package

• -40°C to +85°C Operating Temperature Range

Related Literature

• Technical Brief TB363 “Guidelines for Handling and

Processing Moisture Sensitive Surface Mount Devices

(SMDs)”

• Technical Brief TB379 “Thermal Characterization of

Packaged Semiconductor Devices”

• Technical Brief TB389 “PCB Land Pattern Design and

Surface Mount Guidelines for QFN Packages”

Pin Configuration

ISL9220B

(20 LD TQFN)

TOP VIEW

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

1-888-INTERSIL or 1-888-468-3774

Copyright Intersil Americas Inc. 2010. All Rights Reserved

All other trademarks mentioned are the property of their respective owners.

July 2, 2010

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