ADR421. Regulator voltage output  is the out of specification under some conditions

Regulator voltage output  is the out of specification under some conditions. Is it posible  what regulator can sets the output voltage to 5,5V if input voltage is 12V and about 4,2 if input is 8V while temperature of enviroment is 85C?

Also, the TRIM input - can it be connected to GND?

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