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Why some LM25xx DC-DC adjustable step-up converters have two negative connections (IN- & OUT-) instead of only one ground? Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. Recently I came across several 4-pin LM25xx DC-DC adjustable power converter modules such as the ones below. I'm only familiar with similar 3-pin LM25xx modules that only have one ground connection, such as these.
I searched the Net trying to find a datasheet for any of the 4 pin modules, and found none. The context for my question is this other question (which is currently on-hold) and the fact that I want to design one of such modules myself and wanted to broaden my options.

Also, I realize that the 4-pin modules are adjustable while the 3-pin modules are fixed output. Not the answer you're looking for?Browse other questions tagged dc-dc-converter or ask your own question. I received a CV from an agency but received it direct from the person first - where do I stand? Why is E the correct answer to a practice test on an article titled 'Quake rocks Southern Phillippines'?
Included in the package are the switching controller, power switches, inductor, and all support components. Unlike the 3-pin versions that have plenty of good quality technical information in their datasheets.

But I don't understand what that has to do with the differences in the number of negative pins.
In many cases, the input circuit and the output circuit are separate circuits so their negative poles should be connected somewhere. From the application notes from the adjustable versions of LM25XX, such as below, I cannot imagine how IN- and OUT- pins would be wired up. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages.

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