Integrated IC Combines 1.7A and 800mA Converters in a Single Compact Package
"Many mobile consumer electronics systems require more than 1.5A to power the system microprocessor and less current to power the baseband processor, memory or I/O," notes CJ Zhang, Product Line VP at AnalogicTech. "By combining two optimally sized step-down converters in a single 3x4-mm package, the AAT2789 provides designers with efficient power conversion in a form factor designed to reduce system cost and provide a 25% reduction in board space."
High Efficiency Solution
Operating from 2.7V to 5.5V input range, the AAT2789 2-channel synchronous step-down converter is designed for portable systems powered from a single-cell Lithium-ion battery or consumer equipment using a 3.3V or 5V bus. The dual converter features one channel which delivers up to 1.7A and a second channel which supplies up to 800 mA. Both converter channels use a unique low noise architecture developed by AnalogicTech to minimize output ripple and spectral noise. Each converter also uses its own independent enable pin. Output voltage is externally adjustable.
Low R(DS(ON)) power switches help improve power efficiency at high current levels. To further extend battery life, the device adds a low quiescent current, light load operating mode which maximizes power efficiency over the entire load range.
The AAT2789 also features a high switching frequency which helps minimize external filter size. Peak current mode control eliminates the need for external compensation while optimizing transient performance and stability. To ensure the integrity of the device, the AAT2789 features integrated soft start to limit inrush current. For overload conditions, the device adds over-temperature and current limit protection circuits.
Price and Availability
Qualified across the -40 degrees C to +85 degrees C temperature range, the AAT2789 is available in a 3x4-mm, Pb-free, 16-pin TDFN package. The PMIC sells for $1.79 in 1K quantities.
Advanced Analogic Technologies, Inc. (AnalogicTech) is a supplier of Total Power Management(TM) semiconductor solutions for mobile consumer electronic devices, such as wireless handsets, notebook and tablet computers, smartphones, digital cameras, wireless LAN, and personal media 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 also develops and licenses device, process, package, and application-related technology. AnalogicTech is headquartered in Santa Clara, California and Macau, S.A.R., with offices in China (Beijing, Shanghai and Shenzhen), Hong Kong, Taiwan, Japan, South Korea, Sweden, France and United Kingdom, as well as a worldwide network of sales representatives and distributors. The company is listed on the NASDAQ exchange under the ticker symbol AATI. For more information, please visit the AnalogicTech website: http://www.analogictech.com. (AnalogicTech - G)
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.
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