Hi Paul,
The DRV777 is a good choice for your application. The outputs can be paralleled, though you will need a second DRV777 to parallel 2 outputs each. If you are only driving one stepper motor with 2 DRV777, please consider paralleling 3 outputs each.
Other options available are the DRV8833C and 2xDRV8839. The DRV8833C can be set such that one output is at 5V (no current) while the other output is at 0V, or both outputs are Hi-Z. The DRV8839 has an enable pin on each half bridge, which allows the INx pin to be set to a logic low and the ENx pin to control the current.
The DRV777 is a good choice for your application. The outputs can be paralleled, though you will need a second DRV777 to parallel 2 outputs each. If you are only driving one stepper motor with 2 DRV777, please consider paralleling 3 outputs each.
Other options available are the DRV8833C and 2xDRV8839. The DRV8833C can be set such that one output is at 5V (no current) while the other output is at 0V, or both outputs are Hi-Z. The DRV8839 has an enable pin on each half bridge, which allows the INx pin to be set to a logic low and the ENx pin to control the current.