Which IC component is this?
That logo looks like Diodes Incorporated:

If I had to guess, I would say that IC is probably an AP1539 from Diodes Incorporated, which is an adjustable buck regulator (consistent with the surrounding circuitry). I would suggest AP1539SDPG-13 - IC REG BUCK ADJUSTABLE 4A 8SOP. The pinout in the datasheet seems to match the connections that are visible in the image, as well as the package markings: