Hi,
The absolute Maximum Ratings only list the maximum output current for the analog output pin and that is 10mA. They do NOT list the absolute maximum supply current. The output current will depend on the load you attach to the output pin. That is fully under the users control, thus not really associated with the power supply current or quiescent current of the part. The datasheet only specifies the supply current without a load because of this fact. Different circuits will load the output differently and that is very hard to include in a specification. The quiescent current (or power supply current) is the current that the LM35 draws all on its own. It is specified with a 5V supply to be a maximum of 158uA over temperature for the LM35 (see page 4 under LM35 column). So over temperature that would be the maximum the part would draw without a load. When you load the part the current flowing into the VS pin of the part will increase directly by the amount of load current. That is if you draw 50uA maximum by your load then the current flowing into the VS will go up from 158uA maximum to 208uA maximum for the LM35. Different version of the LM35 (LM35A, LM35CA, LM35C etc.) have a different maximum quiescent current specification so please take a look at the version of the device you will be using. Different versions have different temperature ranges and accuracies.
Take care,