Bob, Diego, and Olin (in alphbetical order)-

Now we need a combined circuit: 0.8-20V in and 5V out.  Is that actually
doable?

David

Bob Blick wrote:

>Diego Sierra said:
>
>
>
>>However, donB4t yours drain -waste-more mA from the cell, at least
>>OlinB4s resistors are 5 times greater ? (just a question, I do not know
>>really).
>>
>>
>
>Hi Diego,
>
>I haven't built Olin's, but he states the efficiency at approx 66% and
>no-load current of 1.25 milliamps. My PFM circuit has about the same
>efficiency and no-load current (700 microamps at 1.1 volt input, 1.5
>milliamps at 1.6 volts input). The PWM circuit has about the same
>efficiency. It is capable of much greater loads and has higher no-load
>current while still using a tiny inductor (it runs at 300 KHz!).
>
>I was trying for something simple in a step-up, something you might
>actually want to build. Roman Black designed a step-down converter with 12
>parts, and it works great. This is the step-up equivalent.
>
>Cheers,
>
>Bob
>
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