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Step-down converter enables 'smallest' handsets

Posted: 05 Jan 2007 ?? ?Print Version ?Bookmark and Share

Keywords:power management? step-down converters? converter? AnalogicTech? 0603?

AAT1149 step-down converter from AnalogicTech

AnalogicTech has developed a high-performance, fast-transient 400mA step-down converter that enables the use of 0603-footprint, 1mm high inductors for the smallest possible solution size. The company said it developed the AAT1149 with space-constrained portable applications in mind.

Developers of mobile handsets and modules for smart phone applications, such as Digital Media Broadcast (DMB) and DVB, strive to drive down system thickness and footprint. By enabling the use of a 0603-footprint, 1mm high inductor, and coming in a small, 2-by-2.1mm SC70JW package, the company said the AAT1149 delivers the power these applications need while setting new standards in solution size and power efficiency.

The AAT1149 delivers 400mA of load current from an input range of 2.7-5.5V. Output voltage is programmable via external feedback resistors from 1V to VIN. The step-down converter achieves up to 98 percent efficiency. No-load quiescent current is 45?A. The 3MHz switching frequency allows the use of extremely small external components and keeps switching losses low.

To prevent damage during overload conditions, the AAT1149 adds current limit protection. An over-temperature protection circuit disables switching if internal dissipation becomes excessive. An integrated 70?s soft start feature limits current surge and eliminates output voltage overshoot at start-up.

Specified over the -40C to 85C temperature range, the AAT1149 is available in a Pb-free, 8-pin SC70JW package that measures 2-by-2.1mm.

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