AnalogicTech Unveils Dual Path USB/AC Adapter Battery Charger IC
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Embedded Digital Thermal Loop and USB Charge Reduction Loop Maximize Charging Current
SUNNYVALE, Calif., Nov. 14 /-- Advanced Analogic Technologies Incorporated (AnalogicTech) (NASDAQ:AATI), a developer of power management semiconductors for mobile consumer electronic devices, today announced the AAT3686, a lithium-ion/polymer battery charger IC designed to operate off both USB and AC adapter inputs. Extending AnalogicTech's growing battery charger IC product portfolio, this new dual-path charger features both an innovative digital thermal loop and a charge reduction loop that allows users to charge the battery with available current from the USB port while keeping the port voltage regulated. The latter feature ensures the battery charge function will not overload the USB port if other system loads share power with the port supply.
"If you're charging a portable device at 500mA using a USB port, and you want to actually use the device while it's charging, the voltage can easily fall out of regulation if worst-case current budgets haven't been set by the designer," said David Brown, Senior Applications Engineering Manager for AnalogicTech. "The AAT3686 simplifies design, decreases charging time, and increases system reliability by integrating a charge reduction function that automatically compensates for voltage sags and throttles back the charge current depending upon how much current other loads on the device are consuming."
The AAT3686 also adds a digital thermal loop control system that maximizes charging current by measuring internal circuit die temperature and reducing that fast charge current when the circuit die temperature exceeds preset thresholds.
For rapid charging, the AAT3686 supports programmable adapter charge current rates up to 1.5A. USB charge rates can be programmed to two levels, USB high and USB low, up to a maximum current level of 500mA. USB charging is automatically disabled when an adapter is present.
The AAT3686 provides a variety of features to protect the integrity of the charging device, the control system, and the battery under charge. Battery temperature and charge state are constantly monitored for fault conditions. Over-voltage and over-temperature protection circuits automatically shut down the device in the event of a failure. Status monitor output pins indicate battery charge status by directly driving two external LEDs. The AAT3686 can also report up to 22 different charging status states to a microcontroller via a serial interface output.
Price and Availability
The AAT3686 is immediately available in a Pb-free, thermally-enhanced, 16-pin 4x4 mm TDFN package. The device sells for $1.64 in 1,000-piece quantities.
About AnalogicTech
Advanced Analogic Technologies Incorporated (AnalogicTech) is a supplier of power management semiconductors for mobile consumer electronic devices, such as wireless handsets, notebook and tablet computers, smartphones, digital cameras, and digital audio players. The company focuses its design and marketing efforts on the application-specific power management needs of consumer, communications, and computing applications in these rapidly evolving devices. AnalogicTech is headquartered in Sunnyvale, California, with offices in Beijing, Hong Kong, Japan, Shanghai, Shenzhen, South Korea, Sweden, and Taiwan, as well as a worldwide network of sales representatives and distributors. For more information, please visit the AnalogicTech website: www.analogictech.com. (AnalogicTech - G)
NOTE: AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders.
CONTACT: Erik Ogren of AnalogicTech, +1-408-737-4600, or erikogren@analogictech.com;
