Making a project using an ATMega328p and an RFM69W 433mhz radio module. I want to run the AVR at 3.3v to make interfacing with the RFM69W (which runs at 3.3v) possible without bidirectional logic level translation. My project has 8 buttons and a PS2-style analog stick. I'm considering using a switching boost converter to supply a steady 3.3v even as my coin cell batteries fade.
I know that the noise from switching regulators can negatively impact things such as radio transmission and reception. A linear regulator is obviously an option, but the quiescent current is typically much higher and the efficiency much lower for these.
Is the interference from these switching regulators noticeable? I don't need a lot of output current, and was planning on sticking to a smaller regulator - for example, the TPS61221 - http://www.ti.com/product/tps61221/technicaldocuments?HQS=TI-null-null-octopart-df-pf-null-wwe