The marking can sometimes be indicated by ST, but is usually not public, especially in the case of customised devices. As the manufacturer of the respective system, you will also find the marking on the packaging label.
As @Tesla DeLorean has already mentioned, your component is a D2PAK aka TO263 and has the marking 5626, although I don't actually have any information about this marking.
Perhaps you could analyse the surrounding circuit and try to find out whether it is a voltage regulator, MOSFET, dual Schottky diode or e.g. a high-side switch.
I am very sorry that I cannot give you a more positive answer, but perhaps I can help with the pending repair of your system.
Regards
/Peter
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