Intersil Corporation a provider in the design and manufacture of high-performance analog solutions, announces the ISL9204, growing its portfolio of fully-integrated single-cell Li-ion (Lithium ion) battery chargers. The ISL9204’s 28V input voltage rating eliminates the over-voltage protection circuit normally required in low-input chargers, reducing component count and overall system cost. The charger accepts input voltages up to 28V but is disabled when the input voltage exceeds the OVP (over-voltage protection) threshold minimum of 10V, enhancing system protection. This device is optimized for smaller cell capacities by setting the trickle charge threshold at 2.7V (recommended by small cell manufacturers) and offering charge current accuracy of 10 percent between 75mA and 150mA.
“Intersil’s ISL9204 is optimized to address the charging requirements of low-capacity 1-cell Li-ion applications such as Bluetooth headsets and small portable multimedia players” said Andrew Baker, product marketing manager of Intersil’s Handheld Power product group. “The ISL9204 offers reduced system cost with increased safety by using integrated over-voltage protection to prevent excessive power dissipation. The tiny 2x3 mm DFN (dual flat no-lead) package enables it to be used in space-constrained and thermally sensitive applications.”
Integration and Efficiency: A Powerful Combination
The ISL9204 performs the constant current/constant voltage (CC/CV) charge function required by Li-ion batteries. The charge current and end-of-charge (EOC) current are programmable with external resistors. When the charge current reduces to the programmable EOC current level during the constant voltage (CV) charge phase, an EOC indication is provided by the charge (CHG) pin, which is an open-drain output. Two indication pins, power present (PPR) and CHG, allow simple interface to a microprocessor or LEDs. The Company has secured design wins and is shipping the ISL9204 in production volumes.
“The Bluetooth headset market has been under development for over five years,” said Susie Inouye, research director and principal analyst of Databeans, Inc. “Only recently has the market really begun to take off, reaching levels that the analysts had earlier predicted, driven by improved form factors and lower prices. And now with most phones having Bluetooth built in, the number of headset shipments could reach well over 100 million units over the next few years.”
• 28V maximum for the voltage power input
• Complete charger for single-cell Li-ion/polymer batteries
• Integrated pass element and current sensor
• No external blocking diode required
• One percent voltage accuracy
• Programmable EOC current
• Charge current thermal foldback for thermal protection
• Bluetooth headsets
• MP3/Multimedia players
• Stand-alone chargers
• Mobile phones
• Other handheld devices
Pricing and Availability
The ISL9204 is available now in an 8-lead DFN standard or lead-free package and is priced at $1.15 in 1,000-unit quantities.
More information on the ISL9204 is available at intersil.com/cda/deviceinfo/0,1477,ISL9204,0.html.
To explore these solutions, visit www.intersil.com/isim/.
To view a broad range of application block diagrams, visit Intersil’s Application Design Center at www.intersil.com/apps.