Intersil’s Li-ion/Li-Polymer Battery Charger Accepts Two Power Sources
Intersil’s ISL9214 Accepts Power Inputs from Both a USB Port and a Desktop Cradle
Intersil Corporation (NASDAQ Global Select: ISIL), a world leader in the design and manufacture of high-performance analog semiconductors, today introduced the ISL9214, a fully integrated low-cost single-cell Li-ion or Li-polymer battery charger. The ISL9214 is an ideal charger for smart handheld devices that need to communicate with a personal computer via a USB.
The charger accepts two power inputs, normally one from a USB (Universal Serial Bus) port and the other from a desktop cradle. When both inputs are powered, the cradle input is used to charge the battery.
"Due to the 28V-rated inputs for the cradle and USB, the ISL9214 offers an extra level of protection to a Li-ion battery from charging system failures. With its 28V input rating, large, low-cost output tolerance adapters can be used safely,” said Andrew Rhind, vice president and general manager for Intersil’s Consumer Power products group. “Because the ISL9214 provides dual input power sources for the cradle and USB, minimal components are necessary, offering the customer cost and board space savings.”
Flexibility and Safety
The ISL9214’s charge current is programmable for the cradle input with a small resistor. The end-of-charge current is also programmable by another external resistor. The charger incorporates Thermaguard™ which protects the IC against over- temperature. If the die temperature rises above a typical value of +125°C, a thermal foldback function reduces the charge current automatically to prevent further temperature rise.
The charger has two indication pins. The PPR (power present) pin outputs an open-drain logic LOW when either the cradle or the USB input power is attached. The CHG (charge) pin is also an open-drain output that indicates a logic LOW when the charge current is above a minimum current level.
When the charge current of the ISL9214 is below the preset minimum current, the CHG pin will indicate a logic HIGH signal. This status is latched and will be reset under one of these events: (1) the part is disabled and re-enabled; (2) the selected input source has been removed and reapplied, (3) the USBON turns LOW, or (4) the BAT pin voltage falls below the recharge threshold (~4.0V).
Key Features
•Complete charger for single-cell Li-ion/polymer batteries
•Dual input power sources for cradle and USB
•Low component count
•Integrated pass elements
•Fixed 380mA USB charge current
•Programmable cradle charge current
•Charge current Thermaguard for thermal protection
•28V maximum voltages for cradle and USB inputs
•Adapter presence and charge indications
•Less than 0.5μA leakage current off the battery when no input power attached
•Programmable end-of-charge current
•Ambient temperature range: -40°C to +85°C
•No external blocking diode required
•Pb-free plus anneal available (RoHS compliant)
Target Applications
•Smart handheld devices
•Cell phones, PDAs, MP3 players
•Digital still cameras
•Handheld test equipment
About Intersil’s Power Management Portfolio
Intersil’s high-performance analog ICs provide innovative power management solutions for applications in the computing, communications, peripherals, display, networking, telecommunications, industrial, instrumentation and battery-powered products markets. Intersil is a leading supplier of PWM controller ICs with over two billion units shipped. Intersil offers a broad portfolio of power management ICs, including single and multiple output switching regulators, integrated FET DC/DC controllers, battery management ICs, hot plug controllers and power MOSFET drivers. To learn more, visit Intersil’s Power Management page at http://www.intersil.com/power.
Analog Technology on Display at Electronica
Intersil will display its complete portfolio of high-performance analog products that address the industry’s fastest-growing markets at Electronica 2006 from November 14-17, 2006 in Hall A4, Booth 207 at the New Trade Fair Centre in Munich, Germany. For more information, visit http://www.intersil.com/cda/Events/Event_shell/0,1246,132,00.html.
Pricing and Availability
The ISL9214 is available now in a 10-lead DFN package and is priced at $1.25 in 1,000-unit quantities. For more information on the ISL9214, visit http://www.intersil.com/cda/deviceinfo/0,1477,ISL9214,0.html.
A large selection of power products is supported by Intersil’s iSim™ online design tool. To explore these solutions, visit http://www.intersil.com/isim/.
Note to editors: To view a high-resolution downloadable photo of the ISL9214, visit Intersil’s photo room at: http://www.intersil.com/pressroom/photoarchives.asp.