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Ron Marcus
- 11th October 2006, 19:13
I need to power a 10F204 circuit from a 1.5 volt cell. The entire device is very small, and I can't use an inductor type switcher as the inductor will substantially increase the overall size. Is there a switch cap doubler out there that will work down to 1 volt? Or...Do some of you brilliant bulbs out there have an extremely low parts count solution? Oh, average current draw will be about 500 uA.

Thanks,
Ron
Luciano
- 12th October 2006, 08:31
Hi,

See this link:
http://cappels.org/dproj/PulseBoostLED/Pulse_Boost_White_LED.html

Best regards,

Luciano
mvs_sarma
- 7th December 2006, 17:02
I need to power a 10F204 circuit from a 1.5 volt cell. The entire device is very small, and I can't use an inductor type switcher as the inductor will substantially increase the overall size. Is there a switch cap doubler out there that will work down to 1 volt? Or...Do some of you brilliant bulbs out there have an extremely low parts count solution? Oh, average current draw will be about 500 uA.

Thanks,
Ron


Hi Marcus,

attached find a jpg file of diagram

regards

sarma
Ron Marcus
- 7th December 2006, 17:12
Thank you sarma,
My board space was limited, so I used the Maxim 1794 DC-DC converter. It is in a SOT package, and even has it's own zero crossing detector switch, which eliminated the Schottky diode. It will start at .8 VDC and draws only a few microamps when not loaded down. Check it out...
Ron
Luciano
- 8th December 2006, 11:29
Hi Ron,

Is the part number MAX1794 correct?

I believe the correct part number is MAX1724.

MAX1724:
http://datasheets.maxim-ic.com/en/ds/MAX1722-MAX1724.pdf

Best regards,

Luciano
skimask
- 8th December 2006, 13:34
Hi Ron,

Is the part number MAX1794 correct?

I believe the correct part number is MAX1724.

MAX1724:
http://datasheets.maxim-ic.com/en/ds/MAX1722-MAX1724.pdf

Best regards,

Luciano



Whew! I spent the better part of a 1/2 hour looking for the 1794. I didn't find it either. Thanks for the info on the 1724.
JDG
Ron Marcus
- 8th December 2006, 15:21
Hi Ron,

Is the part number MAX1794 correct?

I believe the correct part number is MAX1724.

MAX1724:
http://datasheets.maxim-ic.com/en/ds/MAX1722-MAX1724.pdf

Best regards,

Luciano

Oops! I transposed the number on my notes. That's the one.
Sorry,
Ron