I am currently using the 16 pin dip version of the ST232. All I use this for is the voltage doubler section that gives me a +10 volt and -10 volt output. I am currently using a 7805 5v regulator to power the chip.

I am looking to replace the ST232, due to space constraints I need something that requires few support components. I have looked at a few doublers but it requires one for the + side and one for the - side and takes up just as much space.

Can anyone recommend something?

I am also open to suggestion on replacing the 7805, as I don't need a 1 amp supply 300 to 500 ma would be sufficient. Would a 5v Zener give me suitable regulation to power the ST232 or it's replacement?

Input voltage is 11 to 14.5 volts

Edit
I have looked at the surface mount versions of both the ST and the 7805, however the footprint for the 7805 takes just as much space as the TO-220 does. The ST I think is workable.

 

The regulator could be an LM317 set to make the 10 volts, but no space saving. You might be able to get a ICL7660 charge pump to make the -10, but it needs 2 tantalum caps plus it's in a DIP 8 package. And it's only good for 10 ma or so. The 300 - 400 ma needs a regulator in a larger package than TO-92.

Have you considered placing the power supply off the board so you only need a 3 pin connector?

 

Thanks for the suggestions, I'll have a look.