DRV8889-Q1: VM voltage drop

Hello Expert

I use DRV8889 to drive the stepper motor（Rated current 1A;Phase Resistance 3.0Ω；VM=12V）

In my opnion， I think this chip should have a constant current output, which means ensuring the output current of 1A andthe voltage drop on the MOS transistor will reach 12V-3V=9V.

There are a total of 2 outputs, which is 9V * 1A * 2=18W, Tj=18W * 40℃/W=720 ℃，at some point, there will be such a high temperature.