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| Is paralleling 3 LDO regulators a bad idea? |
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| aheid:
Since it has a separate sense pin, couldn't you hook the output to a pass transistor? I couldn't find an equivalent circuit diagram in the datasheet but based on the text it seems it might work. |
| Damianos:
In the last page of the data-sheet they give an idea of how to use two in parallel! |
| Bassman59:
--- Quote from: AndersJ on June 07, 2020, 03:29:15 pm --- Is it a mistake to parallell the LDO outputs? --- End quote --- if the regulator is designed for paralleling, it is not a mistake. See, for example, the LT3080. |
| richard.cs:
The lack of a block diagram or simplified schematic for the device in the datasheet is a little disappointing, so there is no information to deduce if there's a good way to parallel them. Does your circuit have a guaranteed minimum load? Is it a significant fraction of your total load? If so you could put a carefully chosen resistor in parallel with the regulator, such that at max input voltage it passes say 80% of your minimum load current. The regulator then tops that current up to bring the output into regulation and everything is happy. Get it wrong though and the output voltage will rise to meet the input. |
| srce:
--- Quote from: Bassman59 on June 12, 2020, 03:51:09 am --- --- Quote from: AndersJ on June 07, 2020, 03:29:15 pm --- Is it a mistake to parallell the LDO outputs? --- End quote --- if the regulator is designed for paralleling, it is not a mistake. See, for example, the LT3080. --- End quote --- Yep - some recommend it to help reduce noise (by sqrt(N)) or increase max current (by N). |
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