I'm trying to convert 11-16 Vdc to 5 Vdc @ 3 A to run an array of low-impedance ratiometric sensors. The outputs are going either directly into an ADC or amplified through an instrument amplifier. Either way I need fairly low noise (<5mV).
To achive this I'm thinking about either using a switching supply to 6-7v and then a linear regulator or just a quality low noise switcher. The problem is I'm not a power guy and I don't really know what the best options in terms of parts for the switcher and linear regulator would be. Looking around a bit most high current linear regulators have pretty poor PSRR at switching frequencies.
What are good choices for ICs?