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Can I directly replace a “standard” regulator with a “low dropout” (LDO) regulator?

April 26, 2017directly LDO regulator replace standard

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Can I directly replace a “standard” regulator with a “low dropout” (LDO) regulator?

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For the most part, yes. An LDO can replace a standard linear regulator, but there are some things to watch out for: (1) Some LDOs may have a lower maximum input voltage than their comparable “standard” regulators. Carefully compare all of the datasheet specifications. (2) The outputs of most LDOs require a specific type of capacitor with the proper ESR rating placed on the regulators output, otherwise they WILL oscillate. Be sure to read the “External Capacitors” section in the Application Hints section of the LDO”s datasheet. Ceramic capacitors are NOT recommended. (3). With some 5V LDOs, if the input voltage falls below 5V, the current drawn by the regulator may start to increase sharply. Be sure to look over the “Quiescent Current vs. Input Voltage” graphs in the datasheet Typical Characteristic Curves.