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I want to make a programmable LDO. What devices could I use?
For this application, I'd recommend a digital potentiometer such as the AD5141 plus one of our LDOs, in linear gain setting mode. You can select any of our LDOs, ie. ADP1708, and place the AD5141 in the feedback loop. In this case, configuring the digipot in linear gain setting mode, the error will be ratiometric, so you should expect voltage error due to resistor mismatch below 1%. http://www.analog.com/static/imported-files/application_notes/AN-1169.pdf