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TPS630242: Can Vin and Vina seperately connected with different voltage level power source?

Part Number: TPS630242


From Datasheet, both VinA and Vin pins are power supply sources and they are directly connected together in application circuit. But as VinA is just as  source for internal control stage. customer wants to know whether VINA and Vin can be connected separately to different voltage evel power supply , for example, Vin=3.3V, Vina=1.8V. if possilbe, can you share internal circuit or block diagram about Vin and Vina?