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TPS65987D: Supplying from VBUS and Flash supply

Part Number: TPS65987D
Other Parts Discussed in Thread: USB-C-PD-DUO-EVM, TPS62177

Hello,

I have two sort of related questions:

1. My customer is trying to supply TPS65987D from VBUS only (no 3.3V supply) and has copied the Sink schematic from the USB-C-PD-DUO-EVM, but the controller does not seem to turn on. When 3.3V is applied to to VIN_3V3 it seems to work. Is there something we are missing that is required to supply this device from VBUS only? The ADCIN divider is 10k and 100k. 

2. Can LDO_3V3 be used to supply external flash memory when the internal 3V3 rail is also being used to supply the TPS65987D itself?

Thanks,

Michael