Hi team,
I have a couple questions with a customer looking to use this device in a low Vin, low load setting. In the particular low power setting, the input voltage can be as low as 3.3V with a load of 15uA, with the desired output voltage at 3.3V.
First of all, what's the threshold voltage difference between the input and output voltage for the device to enter 100% mode where the low-side switch is off? I see section 8.4.3 mentioning the minimum Vin, but what would be the max before going into PSM mode? Would load current matter here and if so what would it be with the load at 15uA?
Secondly, just want to confirm the quiescent current at 100% duty cycle mode. The electrical characteristics table on page 5 in section 7.5 mentions that Iq typ is 4uA and max is 10uA. This would be the same at all loads while the device is operating in 100% duty cycle right? I see graphs such as Figure 8 showing a curve with the efficiency lower at lighter loads (black line), is that just because of the ratio of the quiescent current and load current?
Thanks for the help and best regards,
Jerry