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DRV8303: voltage drop at GVDD after EN high

Part Number: DRV8303


my customer is facing some issues with the DRV8303.


~ 20ms after switching EN_Gate to high the DRV8303 shows a voltage drop at GVDD (green voltage in the attached scopeplots).

This happen before a MOSFET is switched on (see second scopeplot). At low battery voltage of ~15V the GVDD voltage can drop down below 7V.


What is the issue for that ?

The DRV8303 showed from time to time an undervoltage flag in the failure memory for GVDD.


Capacity between GVDD and GND ~ 10uF MLCC

Best wishes,