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I'm searching for a boost converter to convert up small voltage (min 0.5V / max 81mA) to 5V. (the smaller the better)

Can you recommend a special type number?

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  • \$\begingroup\$ No, as that would be answering a shopping question. -1 for not having bothered to read the rules before posting. \$\endgroup\$ – Olin Lathrop May 2 '13 at 12:18
  • \$\begingroup\$ Have a look for "power harvesting" ICs. \$\endgroup\$ – pjc50 May 2 '13 at 13:11
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The nearest I can find is this device: -

enter image description here

With a 0.5V input it will produce 5V but only with probably 50mA output (Green graph for TPS61202): -

enter image description here

Hopefully it'll work for your application

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Do you want a particular chip that you use to build a circuit, or do you want a ready-built circuit? Pololu has a ready-build boost converter based on the NCP1402. The NCP1402 is a fine boost controller for low voltage/current, and the Pololu implementation is decent. http://www.pololu.com/catalog/product/798/pictures

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protected by W5VO May 3 '13 at 3:21

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