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Dual-input Li-ion charger IC perfect for smart hand-held devices

Intersil Corporation announces the release of the ISL6299 advanced high voltage dual-input battery charger IC for single-cell Li-ion/polymer applications. The charger accepts power inputs from the USB port or desktop cradle/AC adapter, supporting applications in cell phones, smart phones, PDAs, MP3 devices, portable multi-media players, digital still cameras, and other portable industrial and test equipment. It is an ideal charger for smart handheld devices that need to communicate with a personal computer via the USB port. Its features allow portable units to be charged from two alternative sources (USB or desktop cradle/AC adapter) while protecting portable devices from high input voltages and minimizing temperature rise during charging.

The ISL6299 is a complete battery charger, yielding a low component count solution and features that include programmable cradle charge current, charge indication, adapter present indication, programmable end-of-charge (EOC) current with latch. All these advanced features along with Intersil's Thermaguard technology for an added measure of thermal protection are delivered in the ISL6299 chip which is packaged in a tiny 3×3 mm DFN package.

“The ISL6299 is the fourth battery charger device Intersil has introduced in as many months and is evidence of our rapidly expanding product line. Its high input voltage offers a much more robust solution while alleviating the need for expensive over-voltage protection circuitry,” said Andrew Baker, product marketing manager of Intersil's handheld power management group. “Also the EOC programming provides more flexibility to customize the charge function for the termination function for a particular application and the EOC latch prevents false end-of-charge indications. With the increased popularity of using USB for both data synchronization and a source for charging, the ISL6299 offers OEMs the ultimate flexibility of providing end users both USB or cradle charging with simultaneous connection.”

The ISL6299 features maximum input voltages of 28V (cradle) and 7V (USB). With the 28V cradle rating, low-cost (large output-tolerance) adapters can safely be used. When both inputs are powered, the cradle input is used to charge the battery. The charge current is programmable for the cradle input with a small resistor. The end-of-charge current for the cradle input is also programmable by another external resistor. The device incorporates Thermaguard technology, which protects the IC against over temperature during charging. If the die temperature rises above a typical value of 100 degree Centigrade, a thermal foldback function reduces the charge current automatically to prevent further temperature rise.

The device pre-conditions the battery with low current when the battery voltage is below 2.6V. The ISL6299 also has two indication pins. The power present (PPR) pin outputs an open-drain logic LOW when either the cradle or the USB input power is attached. The charge (CHG) 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 is below the minimum current, the CHG pin indicates a logic HIGH signal and the status is latched. The latch resets when the device is disabled and re-enabled; when the selected input source has been removed and re-applied; when the USBON turns LOW; or the BAT pin voltage falls below the re-charge threshold.

ISL6299 Technical Summary
* Complete charger for single-cell Li-ion and Li-polymer batteries
* Dual input of power sources (cradle and USB)
* Low component count
* Integrated pass element
* Fixed 380mA USB charge current
* Programmable cradle charge current (max 1A)
* Thermaguard (TM) charge current thermal protection
* Charge indication
* Adaptor present indication
* Less than 0.5μA leakage current off battery (when no input power attached)
* Programmable end-of-charge current with latch for cradle input
* Ambient temperature range: -40°C to +85°C

The ISL6299 is available now in Pb-free 10-lead 3x3mm DFN packages, in tube or tape and reel. The suggested resale price in 1,000 unit quantities for the ISL6299IRZ-T is $1.30. An evaluation board is also available for this product (ISL6299EVAL1).

Learn more about Intersil's complete family of power management solutions that satisfy a broad range of applications, including computing, communications, peripherals, display, networking, telecom, industrial, instrumentation and battery-powered products from Intersil's Power web site at: www.intersil.com/power/

Intersil Corporation, a NASDAQ 100 Index company, is a leader in the design and manufacture of high performance analog semiconductors. The company's products address three of the industry's fastest growing markets: flat panel displays, optical storage (CD and DVD recordable) and power management. Intersil products include power management devices for battery management, hot-swap and hot-plug controllers, linear regulators, supervisory ICs, switching DC / DC regulators and power MOSFET drivers; optical storage laser diode drivers; DSL line drivers; video and high performance operational amplifiers; data converters; interface ICs; analog switches and multiplexers; crosspoint switches; voice-over-IP devices; and ICs for military, space and rad-hard applications.

ISL6299 Data sheet

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