Choosing the right power technology depends upon what size you need, the size of available PCB real estate, how many voltage outputs are required and how the device can tame the ever-present concern of heat dissipation.
Scanning through the search parameters of distributors reveals tremendous volumes of DCDC converters in all shapes and sizes and for many different applications. One online purveyor of electronic components listed at least 4,500 varieties for ordering.
After reading through some of the part descriptions from several manufacturers, it's clear that power efficiency and power density are the main drivers behind design innovation in these critical components.
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