Electronic – Where does the current in a Dickson Charge Pump come from? Does the oscillator/PWM pin of a microcontroller also source current

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Well, I am making a small circuit which looks like this: enter image description here

When simulated, the load current gets up to about 200-280 mA no problem, so I want to implement this circuit in real life. My only problem is, I want to use either an oscillator, a microcontroller or a 555 timer as the source of the PWM signal V1, but such a device can only source about 20mA, so I am wondering, where does the current through the load come from? The constant 3V source V2? Or does it also come from V1? And if V1 also sources current, how much does it source? Is it under 20mA?

Best Answer

It will come from both sources. I would suggest building a discrete CMOS inverter with a power N-channel and P-channel MOSFET transistor, and then driving this with the PWM signal from the microcontroller. This will alleviate the I/O pin from supplying power.

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