A common challenge faced by every power-supply designer is the ability to achieve high-efficiency targets with lower-output-voltage step-down converters. For example, a 3.3-V output-voltage power supply may provide 91% efficiency at its full load, whereas a 1.8-V version may provide only 84% at full load. This decrease in efficiency produces higher operating temperatures than otherwise would be possible. And for portable systems, it wastes too much battery power...
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