MP20075 operation across different conditions

DC-DC Power Converters
1

Dear Sir/Madam,

I want to check with the below two scenarios when using MP20075 since not found the power-up sequence requirement.

  1. DDQ (pin1) supplies 1.2V, but VDRV (pin5), EN (pin7) & REF (pin6) are no power supply.
    Because the control logic is unpowered.
    Q1.1: Is there any leakage current from DDQ to VTT (pin2) from the above condition?
    Q1.2: How about the VTT pin leakage output voltage?

  2. DDQ (pin1) supplies 1.2V, VDRV (pin5) supplies 3.3V. EN (pin7) & REF (pin6) input signal low.
    Q2.1: What is the shutdown current / disable quiescent on VDRV & DDQ pins? (Because the datasheet listed the VDRV shutdown current with the condition VDDQ=0V which is different above situation.)
    From my understanding, the precision buffer for VTTREF is in operation.
    Q2.2: Which supply pin is the supply source for the precision buffer and the corresponding operation current for VTTREF pin output 0V?

Thanks for the support.
Best regards,
Ping