AnalogicTech’s AAT1153 is a 1.2MHz constant frequency, current mode step-down converter capable of delivering up to 2A of output current. It is available in a 3x3mm TDFN package. The device supplies up to 2A output current from a 2.5V to 5.5V input. Output voltage can range from 0.6V to VIN. Current mode operation offers excellent line and load transient response. The step-down converter extends battery life by running at efficiency levels as high as 95% and can achieve 90% efficiency at its full rated 2A load. It also uses low RDS (ON) internal switches that can run at 100% duty-cycle for low-dropout operation. In addition, light load operation minimises output ripple for noise sensitive applications.
Using a 1.2MHz constant switching frequency, the AAT1153 allows designers to use small external components including lower cost ceramic capacitors. The internal slope compensation setting helps minimise system footprint by allowing the designer to use smaller inductor values. The AAT1153 offers both short-circuit and over-temperature protection. Soft start circuitry limits current surge at input and eliminates output voltage overshoot. It also offers a low shutdown current of less than 1microA. Qualified across the -40 C to +85 C temperature range, the AAT1153 is available in a Pb-free, 10-lead 3x3mm TDFN package.