App note: Design considerations for 5V to 3.3V pass regulators


Great app note from Micrel on thermal management for voltage regulators.

This note discusses the LDO option, including choosing between simple three terminal regulators and full-featured five terminal regulators, and provides formulas, calculations, and a selection of commercial heat sinks for powering 3.3V logic circuitry requiring up to 5 amps from a standard +5V supply. Additionally, a “trick” for reducing heat sink requirements by distributing power dissipation with a series resistor is discussed.

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