Tps7a8300 outputs 2.5v/2a, and 20ns ringing occurs during load 0a-0.3a. What are the reasons? Loop or PCB? In the tps7a8300 specification, does CFF have to use 10nf? What will be the impact of removal?
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On what board are you testing this? 50MHz ringing is well outside of the LDO bandwidth so it must be parasitic LC ringing.
Cff does not need to be 10nF. Adding a Cff typically increases the bandwidth of the device and so improves transient responses. Not having a Cff will not result in ringing like you are seeing.