Hello,
I am using the TPS63030DSKR component to boost from 4.9V to 5.25V, with output current 3mA-40mA depending on the load. I followed the reference design for both schematic & layout, as of this moment I can hear ringing tones at 8kHz and 16kHz when the device is on and operating. I am tying PS/SYNC to ground in to use "Power Save" mode, I noticed that the reference design has generic 2 x 10uF caps in parallel on the output of the regulator. I am using two ceramic caps, which I calculated to resonant at ~8kHz (10uF) and ~16kHz (20uF).
Looking back at the datasheet, there is no mention of specific part numbers for the two caps, nor advise on cap size vs. output current. I am realizing this part is geared towards ~100mA applications, and I am far below that. My solution right now was to swap out the 2 x 10uF ceramic caps to tantalum caps, this makes the ringing go away. However, I am wondering if I even need 2 x 10uF caps for my low current application? (perhaps a single 1uF cap will suffice). Any input appreciated, thanks!