micropower boost circuit

Michael Robinson · 2013-09-22T16:01:32+00:00

I need a DC to DC boost circuit with an output defined not with respect to ground, but with respect to the input, which is variable. Output about 15 volts above the input, over a wide range -- from less than a volt in, up to 15 or 16 volts in. But can be inefficient and only needs to put out a few milliamps. I pasted an LTspice netlist of a possible solution. R15 simulates a grain-of-wheat incandescent. For Q6, if the Zetex is hard to find I might use a DSS416 or some such. What's the consensus about the vulnerability of Q6 when Vin = 16 volts? Version 4 SHEET 1 1388 680 WIRE 496 -160 -80 -160 WIRE 384 -144 352 -144 WIRE -80 -128 -80 -160 WIRE 352 -112 352 -144 WIRE 512 -112 352 -112 WIRE 560 -112 512 -112 WIRE 352 -80 352 -112 WIRE 448 -80 448 -144 WIRE 448 -80 416 -80 WIRE 512 -64 512 -112 WIRE -528 -16 -528 -48 WIRE -528 -16 -560 -16 WIRE -464 -16 -528 -16 WIRE -368 -16 -464 -16 WIRE -352 -16 -368 -16 WIRE -304 -16 -352 -16 WIRE -288 -16 -304 -16 WIRE -192 -16 -288 -16 WIRE -160 -16 -192 -16 WIRE 208 -16 -160 -16 WIRE 272 -16 208 -16 WIRE 288 -16 288 -112 WIRE 288 -16 272 -16 WIRE 304 -16 288 -16 WIRE 448 -16 448 -80 WIRE 448 -16 384 -16 WIRE -464 0 -464 -16 WIRE -192 0 -192 -16 WIRE 272 32 272 -16 WIRE 384 32 272 32 WIRE -368 48 -400 48 WIRE -256 48 -288 48 WIRE 272 48 272 32 WIRE 496 80 496 -160 WIRE 496 80 448 80 WIRE -464 96 -592 96 WIRE -448 96 -464 96 WIRE -384 96 -288 48 WIRE -352 96 -352 -16 WIRE -272 96 -368 48 WIRE -192 96 -208 96 WIRE -128 96 -192 96 WIRE 144 96 -128 96 WIRE 208 96 208 -16 WIRE -464 112 -464 96 WIRE -192 112 -192 96 WIRE -528 128 -528 -16 WIRE -304 128 -304 -16 WIRE -80 144 -80 -48 WIRE 16 144 -16 144 WIRE 272 144 272 128 WIRE 272 144 96 144 WIRE 352 144 352 -80 WIRE 352 144 336 144 WIRE 272 160 272 144 WIRE -464 208 -464 192 WIRE -416 208 -464 208 WIRE -352 208 -352 176 WIRE -192 208 -192 192 WIRE -192 208 -240 208 WIRE -160 208 -160 64 WIRE -160 208 -192 208 WIRE 208 208 208 176 WIRE 208 208 112 208 WIRE 208 224 208 208 WIRE...

Sep 22, 2013 42 Replies

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John K 12 years ago

The LTC3108 claims to operate at 20mV. It appears to use a depletion mode mosfet driving a step-up transformer. Very simple, but the following regulator is a nightmare:

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datasheet-8701600.pdf"

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John K 12 years ago

The link did't work. Try it this way:

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rickman 12 years ago

Both links are truncated in my newsreader, but copying the text of the link and pasting it into the browser address bar works just fine.

Rick

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