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LinkedinAnalogicTech Announces 2A Step-down Converter For Portable Systems
Advanced Analogic Technologies Inc. (AnalogicTech) announced the AAT1153 – a 1.2 MHz constant frequency, current mode step-down converter capable of delivering up to 2A of output current. Available in a compact, 3 x 3mm TDFN package, this new synchronous device is said to help portable system designers meet rising power requirements and still deliver a small, power-efficient solution.
"Whether building new Portable Navigation Devices (PNDs), Portable Media Players (PMPs) or high-end handsets, today’s system designers must constantly add new features and functions that require higher levels of processing power and more current," noted Brandon Pham, Director of Marketing at AnalogicTech. "By delivering up to 2A at high efficiency in a small solution, the AAT1153 step-down converter serves as a key building block in the continual evolution of higher performance, yet compact handheld systems."
The AAT1153 supplies up to 2A output current from a 2.5 to 5.5V input. Output voltage can range from 0.6V to VIN. It is claimed that current mode operation offers excellent line and load transient response. It is also claimed that the new 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 which can run at 100% duty-cycle for low-dropout operation. In addition, light load operation minimizes output ripple for noise sensitive applications.
Using a high 1.2 MHz constant switching frequency, the AAT1153 is said to allow designers to use small external components including lower cost ceramic capacitors. The internal slope compensation setting helps minimize 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 < 1 µA.
Qualified across the -40 to +85°C temperature range, the AAT1153 is available in a Pb-free, 10-lead 3 x 3mm TDFN package. The device sells for $1.15 in 1K quantities.
