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Tanky dps hero typically have a gap closer, irelia's Q, etc.
They are tgr ones that can consistently jump and focus on the carry and last for a few sec of focus fire. It's important to note that tanky dps aren't indestructible, if focused by 5, they still fall, but that would mean your other 4 in team is getting free hits at them.
Also, you don't run out after yiu blow your cd, you stay in there, you arent a mage, you are supposed to.be attacking too! And your auto attack hurts. So running back after cd is wasting your dmg potential.