LICELL is the backup power rail for the PF3000 core logic that keeps the core logic operational even when no valid Vin voltage is applied (otherwise, the core logic takes the power from Vin). The minimum operating voltage is 1.8V (if lower, the core logic is not operational if valid Vin voltage is not applied), the maximum allowed voltage is 3.3V.
Have a great day,
Artur
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