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Ok, should i go with high switching frequency or low? Are there any differences between simple switchers and the one with more sophisticated like feedforward and strict regulation control, does it differ to use voltage control ones or current control ones, etc...?
Many questions at once. These can only be answered when the specification is more in detailed. Each of the different DC/DC converter types has his specific advantage/disadvantage for specific operation conditions. Maybe you can use this online tool: http://www.ti.com/ww/en/simple_switcher_dc_dc_converters/power_module.html to select a DC/DC converter. If the ripple performance is not enough you still could use an LDO to supply the analog circuits. Keeping digital switching noise away from the analog part is the key target for the PCB layout. Here you find some basis of the different types of DC/DC converter and regulator: http://www.ti.com/lit/an/snva559/snva559.pdf .
@ HTA I have been lurking with interest. --- you quoted "If you have analog an digital parts it is best to have a split design with DC/DC-converter followed by a linear regulator. One example of such a DC/DC converter for sensor supply is http://eetimes.com/design/power-mana...gital-supplies ."
After much Googling,I cannot find an example of this or any other chip incorporating both a switching reg and a linear reg on a single chip.--- do you have any info?