On Sun, 20 May 2007 09:58:13 +0200, "M."
wrote:

Hi,
for a small elektronic projekt I need to convert 5Vdc to 22-24Vdc at 100mA
max.
It has to be done on PCB and the area needs to be as small as possible.
Are there any special IC's available for this?

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Yes. Google "boost converter"
--
JF