High-efficiency 1-MHz 600-, 400-mA step-down converters

November 2005
Portable Design;Nov2005, Vol. 11 Issue 11, p44
The article describes AnalogicTech's AAT1123 and AAT1143 1-MHz step-down converters supply 600- and 400-milliampere output currents, respectively, while maintaining 25-microampere no load quiescent current. Both devices support an input voltage range of 2.7-5.5 V and output as low as 0.6 V. The devices are available in a fixed version with internal feedback or programmable version with an external feedback resistor. The 1-MHz switching frequency helps minimize external-component size while keeping switching losses to a minimum. Efficiency levels for both devices range up to 97% and 95%, respectively. Other features include soft start, over-temperature, and current limit protection; 100% duty-cycle low-dropout operation; and 0,1-microampere shutdown current.


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