I am designing a game controller for iphone/ipad and have a question for MFI VBUS drop question.
According to TI document "How to Pass MFi VBUS Spec with USB Charger TPS2583x-Q1 and TPS2584x-Q1", the VBUS drop spec using non lighting connector as below
<1A load, VBUSmin>4.90V
>1A load, VBUSmin>4.97V
on other hand, the VBUS drop spec using lighting is
<1A load, VBUSmin>4.70V
>1A load, VBUSmin>4.55V
It confused me, the spec using lighting is no problem for me, becasue when load incerase IR loss making VBUS drop bigger.
So my question is using non-lighting connector like type-C, why its VBUSmin>1A load higher than VBUSmin<1A load?