Re: 5mW boost converter

Hello Mike,

Here's one with 500nA current drain at 2Hz and 6V Vdd. The output risetime is 70uS so it needs to drive a schmitt input when used as a clock. It works up to 300Hz. The current drain would be higher at 67Hz, but still orders of magnitude lower than the 74hc132:

http://www.imagineeringezine.com/e-zine/lowfreq.html

The trick is to use high value load resistors instead of two mosfets in series.


Ah, the old CD4007. Marvelous chip. But the art of designing such clever circuits must have been lost on the younger generation and there is no such device anywhere in a lower voltage node logic family. I wish there was.

CD doesn't cut it when all you have is one or two alkalines because the threshold of the FETs becomes iffy. But there is nothing wrong with placing a FET or BJT in front of an HC14, or a lower voltage family for single cell operation. Except that it can cause expressions of disgust in design reviews but I kind of got used to that.

Regards, Joerg

http://www.analogconsultants.com
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