Convertor shrinks for ultraportable duties

The AAT1110 is the industry's first 800mA step-down DC/DC convertor in a tiny 2.0 x 2.1mm SC70JW package.

Designers of cellular phones, digital cameras and other small portable devices continue to expand their feature set and in the process move to higher performance processors that demand increased levels of power.

By mounting an 800mA convertor in a tiny SC70JW package, AnalogicTech's AAT1110 delivers the higher current that these new designs require yet still enables the smallest solution size possible.

The AAT1110 is the industry's first 800mA step-down DC/DC convertor in a tiny 2.0 x 2.1mm SC70JW package.

Optimised for extremely fast transient response, this latest member of AnalogicTech's rapidly growing voltage convertor family is ideally suited for powering up heavy loads in high-performance ultraportable convergent systems, such as PDA handsets and smart phones.

The AAT1110 operates across an input range of 2.7 to 5.5V, and output levels as low as 0.6V.

The device delivers up to 800mA of current while maintaining a low 27microamp no load quiescent current.

It is available in either a fixed version with internal feedback or a programmable version with external feedback resistors.

The AAT1110's fast transient response meets the tough specifications required to power the baseband chipset in GSM phones.

A high 1.4MHz switching frequency helps reduce solution footprint by allowing the use of extremely small external inductors and capacitors.

Integrated soft-start capability eliminates any output voltage overshoot when the enable or input voltage is applied.

To protect the device from overload conditions, the AAT1110 limits peak current after a current limit has been sensed over a series of clock cycles.

In addition, an over-temperature protection circuit disables switching once internal dissipation reaches a preset level.

When overcurrent or overtemperature fault conditions are removed, the output voltage automatically recovers.

The AAT1110 is specified over the -40 to +85C temperature range.

The device is available in a Pb-free, 8-pin, 2.0 x 2.1mm SC70JW package.

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