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looking for a low size and cheap DC/DC negative inverter

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Yansi:

--- Quote from: blueskull on January 16, 2020, 03:08:19 pm ---
--- Quote from: Yansi on January 16, 2020, 12:53:56 pm ---Blueskull: Wtf?

--- End quote ---

Because I like to do it this way. In addition I get a free +12V. This is very common in signal circuitry where a bipolar OPAMP supply needs to be generated from a single 3.3V or 5V.

--- End quote ---

I do not like this configuration and do not suggest using it.  A lot of ICs do not like to switch into capacitive loads like this and will trip the OCP. Also I'd say this produces likely more EMI, due to higher di/dt in the charge pump circuit (no di/dt limiting element at transistor switch on). Output regulation is also worse (may not be an actual problem though).

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