Bluetooth headsets, ultra-thin digital still cameras, and a growing number of other portable electronic devices need a step-down converter that delivers relatively low power with high efficiency in a very small footprint. The AAT1121 is an ideal voltage conversion solution for these applications. In a tiny 2x2x0.85mm package using very small external components, the AAT1121 supplies the right amount of current with high efficiency over the entire load range.
The AAT1121 operates over a 2.7V to 5.5V input range with an output as low as 0.6V. With efficiency as high as 96 percent, the AAT1121 maintains a low 30 microamps no load quiescent current. The device also uses a 1.5MHz switching frequency that reduces the size of external components. A high-DC gain error amplifier with internal compensation controls the output and provides excellent transient response and load regulation.
The AAT1121 offers both current limit and over-temperature protection. Soft-start circuitry limits current surge at input and eliminates output voltage overshoot. Specified over the -40 to +85 degrees C temperature range, the AAT1121 is available in an 8-pin, 2x2x0.85mm TDFN package.