5Vdc to 22Vdc: how?

[M.]

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?

Thanks,
Marc

[Lost in the Wasteland]

Hi,

google "voltage doublers"
comes to mind.

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[Mark Aitchison]

Post by M.
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?
Thanks,
Marc

Yes, google LM2577 for example (see p19 of the datasheet or use the
webench facility). (Or you could use a 555 and a transformer plus a
small handful of other components). There are two basic approaches:
switch-mode "boost"/"step-up" DC-DC converters, and simple oscillators
feeding a small transformer (google for "DC-DC inverter"); there is
another method, not requiring coils, that is not really suited to the
amount of voltage increase you need.

Hope this helps,
Mark