This is something so fundamental, the datasheet doesn't even bother to mention it, assuming no one would connect a power device without a heat sink.
If you look at the curve, it tells you you can do 25 A if you keep the core under 55 degrees C. It's up to you to do that with a properly calculated heat sink.
Here's a good paper to start: http://www.ti.com/lit/an/slva462/slva462.pdf