I am running into a problem using the DRV8301 in which the Buck Output voltage will drop out around the same time that the DC motor that I am driving reaches peak current. With the OC_ADJ_SET to 17, and my board temperature around 0 deg C, the buck output voltage (5VDC) shortly after I begin to spin the motor. When I set the OC_ADJ_SET to 15, I am able to run almost as low as -30 deg C. Anything below -30 deg C at the OC_ADJ_SET value of 15 causes the Buck output voltage to drop.
Below is a screenshot of the Buck Output (5V) on Ch2, and the DRV8301 Fault Line (pulled high to the 3.3V supply that is regulated off of the 5 V output) is shown on Ch1. I also have two current probes shown on Ch3 and Ch4. They are connected to two parallel supply wires and their sum is the total DC Current Draw. The total current peaks around 40 Amps when the 5 volt supply drops out. This causes the 3.3V supply to drop as the voltage goes below the dropout voltage level of the regulator. Soon after, the DRV8301 Fault Line goes low. I'm not sure if this is a result of 3.3V supply dropping too low, but essentially this causes a brown out reset on my microcontroller.
Next, I have a screenshot of the Buck Enable line and the DC Power being supplied to the PVDD inputs, along with the 5V buck output and the DRV8301 Fault Line pulled up to 3.3 volts. The Buck enable line stays floating near 4.8volts even though the 5 volt output drops out. 
At this point, I am not sure what else to try. I have attached my schematic. I feel that we have selected the correct components per the datasheet and that we have laid out the components adequately so that there is good grounding. I have even tried adding additional capacitance to GVDD, DVDD, AVDD, but this did not seem to help any.
What could be causing the Buck Output to shutdown when I begin to reach peak current on the DC motor that I am driving?
