Step-down convertor boosts density and efficiency

Convertor extends battery life by running at efficiency levels as high as 95% and can achieve 90% efficiency at its full rated 2A load.

By delivering up to 2A at high efficiency in a small solution, the AAT1153 step-down convertor serves as a key building block in the continual evolution of higher performance yet compact handheld systems.

The AAT1153 is a 1.2MHz constant frequency, current mode step-down convertor capable of delivering up to 2A of output current.

Available in a compact, 3 x 3mm TDFN package, this highly efficient synchronous device helps portable system designers meet rising power requirements and still deliver a small, power-efficient system.

The AAT1153 supplies up to 2A output current from a 2.5 to 5.5V input.

Output voltage can range from 0.6V to the input level.

Current mode operation offers excellent line and load transient response.

The step-down convertor 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-on-resistance 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 high 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 overtemperature protection.

Soft start circuitry limits current surge at input and eliminates output voltage overshoot.

It also offers a low shutdown current of less than 1uA.

Qualified across the -40 to +85 C temperature range, the AAT1153 is available in a Pb-free, 10-lead 3 x 3mm TDFN package.

Back to top