PCB Board design for H-Bridge TLE5206
These sorts of devices (surface mount with exposed metal) are meant to be directly coupled to heavy copper on the PCB to get the heat out of the device. 

Usually this involves a multilayer PCB, with a bunch of vias that connect copper on several layers to the device metal. The vias not only channel heat through the PCB by conduction, they also ensure that the device is well soldered with good copper-to-copper contact.