Datasheet for the LM317, the widely used adjustable three-terminal positive linear voltage regulator, supplied as a 211 KB PDF. It covers pinout for the common packages, electrical characteristics, the output voltage formula based on the two feedback resistors, dropout behaviour and thermal limits. Technicians use it when checking a regulator in power supplies, chargers or bench equipment, confirming adjust and output pins, and choosing resistor values when replacing a failed part or calculating the expected output voltage on a board.
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