In the TPS650250 datasheet 3,3uH is "required for output voltages >2.8V" but this is a bit confusing since w.c. ripple current is at VOUT = VIN/2, see analysis below. It is also a bit confusing that SLVU731A has a 3,3uH inductor for the 1,1V supply without explanation. In the two example diagrams in the datasheet, one has 2,2uH for all 3 DCDCs, and one has 3,3uh for the 3,3V reg.
If ripple current is the issue then there is a double fault in the texts mentioned. It should read: "Larger inductance might be a good idea the closer VOUT is to VIN/2".
Analysis: I_RIPPLE = VOUT*(1-VOUT/VIN)/f/L; dI_RIPPLE/dVOUT = (1-2*VOUT/VIN)/f/L; Maximum I_RIPPLE is when dI_RIPPLE/dVOUT i e VOUT = VIN/2. In our case we have VIN = 5V so w.c. in for VOUT = 2,5V (and max allowed VIn is 6V so it won't get much higher in any application).