Switching Charger for 1-Cell and 2-Cell Li-ion
Batteries
ISL9220, ISL9220A
Features
• Highly Integrated Battery Charger IC
• Charges 1- and 2-Cell Li-ion or Li-Polymer Batteries
• Up to 2A Charge Current
The ISL9220, ISL9220A is a cost-effective and versatile
battery charger for 1-cell and 2-cell Li-ion and 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.
• Synchronous Buck Topology with Integrated Power
FETs
• 1.2MHz Switching Frequency
• 0.5% Charge Voltage Accuracy
A simple charge current programming method is
provided. External resistors program the fast charge and
end-of-charge currents.
• Programmable Input Current Limit with One External
Resistor
The two status outputs can be used to drive LEDs, or can
be connected to host processor.
• Thermistor Interface for Battery Detection and
Temperature Qualified Charging
A programmable charge timer provides the ability to
detect defective batteries, and provides a secondary
method of detecting charge termination.
• Two Status Outputs
• Programmable Charge Safety Timer
• Short-Circuit and Thermal Protection
• Small 4mmx4mm TQFN Package
• -40°C to +85°C Operating Temperature Range
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.
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
Applications
• PDAs and Smart Phones
• MP3 and Portable Media Players
• Handheld GPS Devices
• Technical Brief TB379 “Thermal Characterization of
Packaged Semiconductor Devices”
• Technical Brief TB389 “PCB Land Pattern Design and
Surface Mount Guidelines for QFN Packages”
• Digital Still Cameras
• Industrial Handheld Scanners
Pin Configuration
ISL9220, ISL9220A
(20 LD TQFN)
TOP VIEW
STAT2
EN
PGND
SW
1
2
3
4
5
15
14
13
12
11
AGND
ISET1
ISET2
SW
EPAD
(AGND)
VHI
VIN
July 2, 2010
FN6936.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2010. All Rights Reserved
1
All other trademarks mentioned are the property of their respective owners.