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Arduino drives high-side MOSFET switch

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Hi folks,

I have four nMOS switches connected in Series with flying cap to boost input voltage to higher level ( circuit schematic attached). I am driving them using Arduino which has capability of 20mA/pin, my switches need only 5mA/switch, So I think I don't need a gate drive. The problem I am facing now how to shift the signals for upper switches (M2,M3,M4) because their sources are not in connected to ground. I thought of using bootstrap circuit but it seems the bootstrapping is applicable only with gate drivers and also needs isolated power supply. I thought of level shifters but really don't now how to implement them here??

Any hints?

Thanks alot
 

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Hi,

You could make it difficult, or just use an ICL7660.

Is it really worth the whole effort?

Klaus
 

Thanks Klaus for your feedback, I find the IC you shared interesting, however I looked at the data sheet and find nothing regarding how to change n where (n=Vout/Vin as shown in first page of the datasheet)

regarding my circuit, this is just a portion of it, my whole circuit is something like configurable converter that gives you multiple output levels based on logic selection. For now, I want those switches with sources ungrounded to be fully switched on and off with my Logic signals?!
 

Hi,

I can't see how you can generate different output levels..

If you don't want to use true high side drivers..
* photomos are maybe too slow
* simple optocouplers could work
* maybe analog switches...check supply voltage requirements.

Klaus
 

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