Power Electronics

DC-DC Synchronous Buck Converter Family

Advanced Analogic Technologies Inc. (AnalogicTech), a developer of innovative power management solutions, has introduced the AAT1151 synchronous buck converter. Delivering more than 700-mA output current in a compact 3-mm × 3-mm QFN package across a 2.7-V to 5.5-V input range, the step-down switching converter can be used in a variety of portable applications powered by a single-cell Li-Ion/Polymer battery.

The latest addition to AnalogicTech’s expanding Total Power Management IC product family operates at a fixed 850-kHz switching frequency and combines PWM and PFM control to maintain high efficiency across all load conditions. Low on-resistance, 110 mΩ and 100 mΩ, respectively, for the switch and synchronous rectifier, greatly increases full load efficiency.

“A growing number of high performance PDAs, MP3 players, smartphones and peripheral cards need higher efficiency step-down capability to maximize power utilization and extend battery life,” said Erik Ogren, product marketing manager for AnalogicTech. “By delivering 700 mA with PWM and PFM in the same footprint as an SOT-23 package, the AAT1151 helps designers meet their current needs without jeopardizing power budgets or device footprint.”

The current-mode controlled AAT1151 uses synchronous rectification to reach efficiency levels of up to 95%. Fully integrated compensation simplifies design and minimizes external parts count. Shutdown current is less than 1 µA. The AAT1151 also features internal soft-start and complete over-temperature and current limit protection.

Qualified across the standard -40 to 85°C industrial temperature range, the AAT1151 is available in either a 16-pin QFN 3 mm × 3 mm or MSOP-8 package. Pricing starts at $1.20 per unit in 1000-piece quantities.

For more information, visit www.analogictech.com.

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