PINOUT ON LT1789CS8-1
Have a look in the datasheet to be sure, but it is very likely to be the bottom left pin in the IC the correct way up in the picture. This is because:


The edge is chamfered down on that side, usually an indication that that is the pin 1 side.
The text is orientated correctly.


Neither of these indications is standard, so be sure to check the datasheet!