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Step-down converter enables small-sized portable apps

Posted: 04 Jan 2007     Print Version  Bookmark and Share

Keywords:AnalogicTech  AAT1149  step-down converter  0603 footprint  portable applications 

AnalogicTech has developed the AAT1149 as a high performance, fast transient, 400mA step-down converter that enables the use of the industry's latest 0603 footprint, 1mm high inductors for the smallest possible total solution size. The company has 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 Digital Video Broadcast (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 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 2.7V to 5.5V. Output voltage is programmable via external feedback resistors from 1V to VIN. The step-down converter achieves up to a high 98 per cent efficiency.

No load quiescent current is only 45µA. 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 70µs soft start feature limits current surge and eliminates output voltage overshoot at start-up.

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

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