AnalogicTech – First 800mA step-down DC-DC converter in 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 converter 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, says the company.

The AAT1110 is said to be the industry’s first 800mA step-down DC/DC converter in a tiny 2mm x 2.1mm SC70JW package. Optimized for extremely fast transient response, this latest member of the company’s rapidly growing voltage converter family is seen as ideal for powering up heavy loads in high performance, ultra-portable convergent systems, such as PDA handsets and smart phones.

The AAT1110 operates across an input range of 2.7V to 5.5V, and output levels as low as 0.6V. The device delivers up to 800mA of current while maintaining a low 27uA no load quiescent current. It is available in either a fixed version with internal feedback or a programmable version with external feedback resistors.

The device’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 pre-set level. When over-current or over-temperature fault conditions are removed, the output voltage automatically recovers.

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