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3V to 20V Boost for Low Current Application

John Ramshur
Prodigy 50 points
Other Parts Discussed in Thread: TPS61041

I need to boost 3V to 20V, but only need <1mA of current. I need a very small solution for my portable device. Most boost converters I find seem to not operate at at very low output currents.

What would be the best way to generate <1mA at 20V?

  • 0
    TI__Guru*** 147810 points

    All of the TPS61xxx boosts operate down to no load just fine.  Would the TPS61041 work for you?

  • 0 in reply to Chris Glaser
    Prodigy 50 points

    I don't see any info about minimum output current, but the efficiency graph doesn't go below about .4 mA. Are we sure it works that low? 

    I'll explain the application a little more. I'm using this in a constant current source 1-100uA with 20V compliance. The current will be pulsed for 1-2 ms every 100-1000 ms (<2% duty cycle).  I may power an opamp with the 20V also, but the total current will still remain below 1 ma.  The size and efficiency of this is extremely important, as it will be used on a small battery powered device. 

  • 0 in reply to John Ramshur
    TI__Guru*** 147810 points

    Yes, it operates down to no load just fine.  There is a whole family of TPS6104x devices with various features that might make your design a little easier.