ISL9220_10 Datasheet, PDF (1/15 Pages) Intersil Corporation – Switching Charger for 1-Cell and 2-Cell Li-ion Batteries

Switching Charger for 1-Cell and 2-Cell Li-ion
Batteries
ISL9220, ISL9220A
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.
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 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- and 2-Cell 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
• Programmable Input Current Limit 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 4mmx4mm 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
ISL9220, ISL9220A
(20 LD TQFN)
TOP VIEW
STAT2 1
EN 2
AGND 3
ISET1 ₄
ISET2 ₅
EPAD
(AGND)
15 PGND
14 ^SW
13 ^SW
12 VHI
11 VIN
July 2, 2010
FN6936.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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