DRV8837: What is the efficiency of DRV8837?

Part Number:DRV8837

Hi,

I saw that DRV8832 has an efficiency parameters but the DRV8837 does not have it.

How can I get these parameters? From a short test I ran I get low efficiency at 5V operation with a 27Khz PWM and 100mA DC Brush motor consumption.