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How to connect unused pins?

Category: Hardware
Product Number: ADP5320

Hello, on the ADP5320, how are unused pins connected? I didn't see it mentioned in the datasheet. For example, how are unused regulator inputs to be connected? (e.g. PVIN8, PVIN9). Also should the corresponding outputs (VOUT8, VOUT9) be connected to anything or just left floating?

Is there any harm in grounding the unused regulator inputs? It simplifies routing slightly and may allow me to get rid of the L2-L3 drill pair which will save money.