AnalogicTech's Step-down Converter Delivers up to 2X Faster Transient Response

(Product News, 2 Oct 2008)

Advanced Analogic Technologies Inc. (AnalogicTech) has launched AAT1130, a high performance 500mA monolithic step-down converter that, using an innovative pseudo fixed-frequency architecture, offers transient response at least 2X faster than a traditional 500mA, 2MHz, PWM-mode buck converter while supporting the use of extremely small, 1µH chip-scale inductors.

Designed for mobile electronics applications, the new converter operates across a 2.7V to 5.5V input range and low quiescent current of 60µA and delivers an output between 0.6V and 1.8V. The AAT1130 delivers up to 500mA of maximum continuous output current. Internal MOSFET switches allow the converter to support efficiency rates up to 92 percent over a wide load range.

The AAT1130's architecture operates at a fixed switching frequency in steady-state operation while allowing the control circuit to react almost instantly to transients. With a programmed output voltage of 1.2V, the AAT1130 can handle severe load transients from 10mA to 500mA and still maintain output voltage accuracy within ±5 percent. Operating at a high 2.5MHz switching frequency, the new step-down converter keeps output voltage ripple low while enabling the use of small, 1mm high 0603 inductors.

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