I am trying to design a dual rail power supply for a photo diode detector. 

I don't want to use those dual output switched mode power supply modules because they tend to have a lot of ripple. Anyone disagree?

I my solution is to use a switched capacitor voltage inverter chip  followed by a -ve linear regulator for the -ve supply.  

I am having problems finding:

1.   LDO -ve linear regulators and 
2.  surface mount switched capacitor inverters that can accept more than 5.5V input with > 50kHz switching freq.

Anyone tell me how it should be done?



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