would be nice if there were charge pump controllers that could be synchronized to an external clock, but it doesn't look like they exist.
-F/R
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I guess we can understand why--a charge pump would generate less noise than a conventional switching regulator, lessening the need to keep a strictly known clock frequency, and they're not usually used for high loads (and lower load also means lower noise due to lower currents involved)
but the thing we're doing for work right now has a requirement that they all be synchronized, and the requirement comes from the sponsor, not anyone we know or can interact with directly
-F
