AnalogicTech Intros AAT1123/AAT1143 Step-Down Converters

Advanced Analogic Technologies Inc. (AnalogicTech, Sunnyvale, CA), a developer of power management solutions, introduced two new 1 MHz step-down converters, the AAT1123 and AAT1143, which are available in a small 2.0 mm x 2.1 mm SC70JW-8 package and supply 600 mA and 400 mA (maximum) output current, respectively, while maintaining a low 25 µA no-load quiescent current.

The AAT1123 and AAT1143 support an input-voltage range of 2.7 V to 5.5 V, and output as low as 0.6 V. The devices are available in either a fixed version with internal feedback or a programmable version with an external feedback resistor. The 1 MHz switching frequency helps minimize external component size while keeping switching losses to a minimum. The AAT1123 also features a fast 100 µs (typical) turn-on time. Efficiency levels for the AAT1123 and AAT1143 range up to 97 percent and 95 percent, respectively. The new step-down converters also feature soft start; over-temperature and current-limit protection; 100 percent duty cycle, low-dropout operation; and 0.1 µA shutdown current.

The AAT1123 and AAT1143 are rated over the -40 °C to +85 °C temperature range. Samples are available now. The devices sell for $1.09 and $0.92, respectively, in 1,000-piece quantities.