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Don't diss the LDO

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Duane Benson
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re: Don't diss the LDO
Duane Benson   7/14/2010 11:35:14 PM
There are still plenty of applications that are just fine with a three-terminal LDO. Even plenty that do well with a non-LDO 78XX series regulator. Sure there are tight tolerance applications that need something newer and more efficient, but it's hard to find something easier to implement than a little three-terminal linear regulator. It may not have the cachet, but it's quick to design in and, in the right place, will just work solidly.

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re: Don't diss the LDO
green_is_now   7/9/2010 10:35:57 PM
It can be just as efficient as a multistage SMPS if a 1st stage smps is creating a voltage just above the LDO limit. If small currents then 2nd dc2dc switching and conduction losses elimination may cover LDO losses for small loads. If 1st stage is a output needed for another rail even better.

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re: Don't diss the LDO
kendallcp   7/4/2010 12:42:01 PM
When you pick a regulator vendor, consider the support they provide for simulation. Many people agonize about finding the best simulation models for their op-amps, but few people actually model what's happening on their supply rails, if they are using linear regulators. Not all three-terminal regulators are the same, either in the noise that they spit out or in the way they respond to variations in current demand!

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