$5 - ATs in BB. To weak?

[Miraculix]

Did I give up to easily here and should I have raised to, say 300 instead of just 150?
Comments please
// M

PokerStars Tournament, Big Blind is t50 (8 handed) Converter on pregopoker.com

UTG (t2180)
UTG+1 (t1100)
Hero (t1595)
MP2 (t1255)
CO (t1290)
Button (t1390)
SB (t1210)
BB (t3480)

Preflop: Hero is in MP1 with A[img]/images/graemlins/diamond.gif[/img] T[img]/images/graemlins/diamond.gif[/img]
<font color="gray">UTG folds</font>, UTG+1 calls t50, <font color="red">Hero raises to t150</font>, <font color="gray">MP2 folds</font>, <font color="gray">CO folds</font>, <font color="gray">Button folds</font>, <font color="gray">SB folds</font>, <font color="gray">BB folds</font>, UTG+1 calls t100

Flop: (t375) 4[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/club.gif[/img] 8[img]/images/graemlins/heart.gif[/img] (2 players)
<font color="red">UTG+1 bets t150</font>, <font color="gray">Hero folds</font>