The AAT1110 from Analogictech is a 800mA step-down DC/DC converter in a 2.0 x 2.1mm SC70JW package. Optimized for fast transient response, this device is suited 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 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 1.4MHz switching frequency helps reduce solution footprint. 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 AAT1110 is specified over the -40 to +85 degrees C temperature range. The device is available in a Pb-free, 8-pin SC70JW package.