Lpc2000

Sorry for the OT post, but I figure that since this is something common to 
embedded projects you guys might have an elegant solution.

I'm looking to create a contrast voltage (typ -13V 10mA) and a LCD Drive 
voltage (min -23V 10mA), onboard I have +5V, +3.3V and Vin which is 
typically +12V.  Ideally the contrast should be digitally controllable.

The big part of the problem: it needs to be relatively cheap.

I've been having a hard time trying to figure out the best way to do 
this.  The best way that I can think of so far is going to be via voltage 
multipliers.  I.e. take 3.3, invert and quadruple to get -13.2V for the 
contrast, and then double again to get -26.4V for the LCD Drive.  I don't 
know however if I can handle 10mA this way after octupling the voltage.

I'm trying to stay away from switched regulators, as they can get expensive.

Thanks for any suggestions that you may have.

-- Sean