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

ap_design_consideration_for_5v_3v3_pass_vreg

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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