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AnalogicTech Announces 500 mA Boost Converter

Advanced Analogic Technologies Inc., Press Release - 1/22/2007

Monolithic Device Simplifies USB 2.0 Host Port, On-The-Go Operations in Single-Cell
Lithium-Ion Powered Systems

Advanced Analogic Technologies AAT1275

Advanced Analogic Technologies AAT1275

SUNNYVALE, Ca. - Advanced Analogic Technologies Incorporated (AnalogicTech) (NASDAQ:AATI), a developer of power management semiconductors for mobile consumer electronic devices, announced today the AAT1275, a new type of power management IC that combines a 500 mA boost converter with a current-limiting load switch. By bringing together a regulated 5V, 500 mA output with current limit protection in a single monolithic device, the AAT1275 simplifies the development of host USB ports in portable electronics systems powered from a single-cell Lithium-ion battery.

"As a growing number of smart phones and other handheld devices operating off a single-cell lithium-ion battery add higher levels of processing power and begin to serve as central computing platforms, users are demanding connectivity to other peripheral devices," said Bill Weiss, Product Line Director at AnalogicTech. "By integrating a boost converter with a current-limiting load switch, the AAT1275 allows designers to boost voltage and provide the protection needed to simply and efficiently host a USB port on these new computing-intensive convergent portable systems."

Programmable Output

Operating from a 2.7 to 5V input range, the AAT1275 supports both USB 2.0 host port and USB On-The-Go operation in single-cell Lithium-ion battery powered systems. While the load switch current limit defaults to the standard USB 500 mA limit, it can be programmed to lower values to host lower current USB ports, thereby saving precious battery power, or support any application that requires a current-limited 5V supply. To maximize battery life, the boost converter section of the AAT1275 provides efficiency levels of greater than 90 percent across a wide load range. A high 2 MHz switching frequency provides fast load transients and minimizes the size of external components.

One of the most difficult challenges designers face using conventional boost converters is leakage current. To address this problem, the AAT1275 adds an innovative True Load Disconnect feature which minimizes losses and simplifies design by isolating the load from the power source when the AAT1275 is off.

The integrated programmable current limiting load switch on the AAT1275 provides USB port protection too. An active low fault flag alerts the system when an over-current condition is applied to the AAT1275 output.

To ensure device integrity, the AAT1275 also adds over-temperature and over-current protection and inrush current limit capability.

Price and Availability

Specified over the -40 degrees C to +85 degrees C temperature range, the AAT1275 is available in Pb-free, 2.75 mm X 3 mm 12-pin TSOPJW or 16-pin TDFN34 packages. The device sells for $1.75 each 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:

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.