Toshiba TB6560AHQ : Weekend die-shot

Toshiba TB6560AHQ is a widely used stepper motor driver.
You can immediately notice dual bond wires for power outputs. Die is attached to 2mm-thick solid copper heat spreader.

I keep thinking that it might have been easier to dissipate heat if only power transistors were not clumped up on the left side.

Die size if 5338x4828 µm.