PHILLIPS dsr 7141/22 satellite receiver

[Quase]

Hello,

I am repairing an satellite receiver and can't identify an sod23-6 package on the board.
It's where the dc voltage enters the unit.
I want to ask of anyone know what component is or look via the board layout what it could by.
I think it is an voltage regulator but i am not sure. The SMD code on the chip is AT3A but the last
character is not readable.

Regards,
Quase.