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If he puts me on AA or KK and have hit this uncordinated board then why isnt he going for a checkraise?

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Your the one that called him a donk right?

I can think of 2 reasons: 1) He wants to protect his hand and signal to the other callers that he is willing to take on the PF raiser 2) He wants your whole stack.

Reason 1 is kind of weak. Reason 2 is a lot more interesting. Looking at the hand from his perspective, he might be thinking a couple of things: namely, i have crap, but am gonna bluff this guy off the pot or i am going to pot my made hand and see if my opponent will make a mistake and overplay his high pocket pair.

Bluffing picks up the pot with crap and only risks 10% of his stack, which isn't too bad. Check raising wins him an extra 9 bucks, because you will probably lay it down right there. Potting and hoping you overplay either wins the pot (so-so) or nets him half to all of your stack (very nice).