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Every electronic device includes a DC-DC converter for its power supply. That supply might come from a USB port, a "brick", a wall-wart, or in larger systems, there could be multiple point-of-load converters scattered around a single circuit board.   When you have a DC voltage that you need to change into another voltage, you have two options: a linear regulator or a switch-mode power supply design. Let's take a look at the difference between the two and a couple of cases where you might c ...