TPS7A57: PSRR TPS7A57

Hi,

The data sheet does not have plot for PSRR with different VIN like 1.8V, 2.5V, 3.3V. What is the PSRR vs frequency at

1. VBIAS of 3.3V
2. VIN 1.8V
3. Output of 0.9V
4. Current: 1.5A

What is the PSRR vs frequency at:

1. VBIAS 3.3V
2. VIN 2.5V
3. VOUT 1.8V
4. Current 1.5A

What are the conditions for RθJA of 21.9 C/W? Thermal resistance of 21.9 with 5A current is a big positive of this device.

thanks, Abhijit