I have a DRV8801 connected in the circuit that I am working on and the one in the breadboard. Neither has ever worked for me, and both are displaying the same symptoms. I have a third DRV8801 that is unused.
I have checked for shorts on the DRV8801 and cannot find any, except between the two GRD connections. The resistance between the various other pins is about what I would expect given the circuit description. I have checked the voltages the breadboard circuit is supplying to the DRV8801 and they are all as expected.
I have been very careful about not supplying a reverse voltage to VBB, but this is still a remote possibility.
I have check and re-solder VMM & OUT+. The circuit is too small for me to accurately verify the solder connections.
The breadboard is still behaving as described earlier.
If you can give me a copy of the test setup and procedure for the DRV8801, I will try it with my remaining DRV8801.