Battery Charger IC supports 1-cell Li-Polymer batteries.September 15, 2010 -
With up to 2 A charge current, Model ISL9220B charges 1-cell Li-ion or Li-Polymer batteries. Unit features synchronous buck topology with integrated Power FETs, 1.2 MHz switching frequency, and 0.5% charge voltage accuracy. Input current limit is programmable with external resistor. Housed in 4 x 4 mm TQFN package, charger operates from -40 to +85°C and includes 2 status outputs, programmable charge timer, and thermistor interface for battery presence detection.
(Archive News Story - Products mentioned in this Archive News Story may or may not be available from the manufacturer.)
Original Press release
Intersil Corporation
1001 Murphy Ranch Rd.
Milpitas, CA, 95035
USA
ISL9220B
Product Information
Key Features
o Highly Integrated Battery Charger IC
o Charges 1 Li-ion or Li-Polymer Batteries
o Up to 2A Charge Current
o Synchronous Buck Topology, with Integrated Power FETs
o 1.2MHz Switching Frequency
o 0.5% Charge Voltage Accuracy
o Input Current Limit Programmable with One External Resistor
o Thermistor Interface for Battery Detection and Temperature Qualified Charging
o Two Status Outputs
o Programmable Charge Safety Timer
o Short-Circuit and Thermal Protection
o Small 4x4mm TQFN Package
o -40°C to +85°C Operating Temperature Range
Description
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.
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