LTC6404 - Exposed Pad

Hello,

I am wondering where to connect the Exposed Pad to? The datasheet says connect to V- and do not connect to ground if split power supplies are used. (But Ground and V- are the same in my design)

My design has the same power source connected to all of the V+ and V- Pins.

Is there any use to the Exposed pad beside transferring heat away from the chip?

Is there a problem if it is floating and not connected?

Hope you can help me. 

Best regards