I need help identifying component(3729B AKAF)

[cold_zero]

i need help go get datasheet for ic 3729B AKAF i found it on motherboard gopro5
it's marked by rectangle 
thank you

[golden_labels]

Without a good quality photos of (1) the chip, (2) the chip and its neighbourhood, nobody can tell much. May be anything.

For example the first result while searching for phrase ‘3729B AKFA’: AMS AS3729B “8A Power Stage”. The markings described in Fig. 15 (p. 12) of the datasheet are matching your description.

[cold_zero]

you are right , sorry it's my bad i edit the post and add images

[golden_labels]

The lime square marking hides all the traces, but it seems to be roughly matching (Fig. 3 on p. 3, rotated by 180°). The presence of inductors and fat traces also suggests this is a power supply chip.