We need to know below specification of TPS82130 for the specified input & output requirements. Seen the similar query in some other thread, but further discussion was in private mode.
Two combinations are required: One 12V to 5V and second 3.3V to 1.2V
Vin=12V / 3.3V
Vout=5V / 1.2V
Iout=1.5A / 0.5A
Thermal Derating
Load Regulation
Line Regulation
Switching Frequency
Input and Output Ripple in PWM Mode
Input and Output Ripple in PSM Mode
Load Transient
Startup without Load
Startup / Shutdown with Resistance Load
Regards
Hafiz