Tiny 800mA step-down DC/DC converter

Optimized for extremely fast transient response, this latest member of AnalogicTech¹s rapidly growing voltageconverter family is ideally 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 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 AAT1110¹s 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 AAT1110 is specified over the -40 to +85 degrees C temperature range.
The device is available in a Pb-free, 8-pin, 2.0x2.1mm SC70JW package
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