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Step-down converter steps up to power requirements

Posted: 22 Apr 2008 ?? ?Print Version ?Bookmark and Share

Keywords:AAT1153? step-down converters? power?

From Advanced Analogic Technologies Inc. (AnalogicTech) comes the AAT1153, a 1.2MHz constant frequency, current mode step-down converter that is capable of delivering up to 2A of output currents, according to the company. Available in a compact, 3mm x 3mm TDFN package, the synchronous device, says AnalogicTech helps portable system designers meet rising power requirements and still deliver a small, power-efficient solution.

"Whether building new portable navigation devices, portable media players (PMPs) or high-end handsets, today's system designers must constantly add new features and functions that require higher levels of processing power and more current," notes Dan Dempsey, technical marketing manager for AnalogicTech. "By delivering up to 2A at high efficiency in a small solution, the AAT1153 step-down converter serves as a key building block in the continual evolution of higher performance, yet compact handheld systems."

The AAT1153 supplies up to 2A output current from a 2.5-5.5V input. Output voltage can range from 0.6V to VIN. Current mode operation offers line and load transient response. Using 1.2MHz constant switching frequency, the AAT1153 allows designers to use small external components. According to the company, the internal slope compensation setting helps minimize system footprint by allowing the designer to use smaller inductor values. The AAT1153 offers both short-circuit and over-temperature protection. Soft start circuitry limits current surge at input and eliminates output voltage overshoot. It also offers a low shutdown current of Qualified across the -40C to 85C temperature range, the AAT1153 is available in a Pb-free, 10-lead package. The device sells for $1.15 in 1,000-unit quantities.

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