EDIT: Based on additional Info my answer is most likely wrong, since according to Chipyto pin 2 is at 5 V, which would not make sense with this part.
I'd say it is one of these two:
Both are marked ...
It's a QX Micro Devices (Shenzhen) QX2304L33T. Datasheet here
The trailing 'A' is the batch number.
From their website (no English datasheet):
Ø Maximum efficiency: 95%
Ø Maximum working frequency: ...
From the code (and silkscreen) looks like a BAT54C, common cathode, dual diode. Several possible manufacturers, but here's a link to the Vishay datasheet.
The date and lotcodes also fit with specific ...