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Step-down converter delivers fast transient response

Santa Clara, Calif. — Advanced Analogic Technologies Inc. (AnalogicTech) has released a high-performance, 500-mA monolithic step-down converter. Using an innovative pseudo fixed-frequency architecture, the AAT1130 converter offers transient response at least 2x faster than a traditional 500-mA, 2-MHz, PWM-mode buck converter while supporting the use of small 1μH chip-scale inductors, according to the company.

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

The AAT1130 device's unique 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 1.2 V, the AAT1130 can handle severe load transients from 10 mA to 500 mA and still maintain output voltage accuracy within +/- 5%, AnalogicTech said.

Operating at a 2.5-MHz switching frequency, the step-down converter keeps output voltage ripple low while enabling the use of small 1-mm high 0603 inductors. The device is available with either fixed or adjustable output regulation voltage options. In the adjustable configuration, output voltage is set with an external resistor voltage divider circuit.

To manage output voltage overshoot, the AAT1130 features internal soft start. The IC also includes over-temperature and current limit protection circuits. The AAT1130 is qualified across the -40°C to +85°C temperature range. It comes in a 2 x 2.2-mm,10-pin SC70JW package.

Pricing: $0.87 in quantities of 1,000.
Product information: AAT1130

Advanced Analogic Technologies, Inc. , www.analogictech.com

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