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Tas5756m power question

Hi all!

Is it harmful for the device to be fed pvdd without any of the 3v3 pins being supplied (eg dvdd etc)?

I ask because the chip "popped the hood" on us while testing just that and a pretty large crater suddenly appeared on the top of the chip revealing its guts. Probably some other problem or mistake but good to rule that out while trouble shooting and would of course affect desicions around psu design.