The PMIC chip has 3 terminations. The sum of the pins in this unit is 3. This device has a regulator type called FIXED NEGATIVE SINGLE OUTPUT STANDARD REGULATOR, which means it operates on a DC voltage.
SG120-08T/883B Features
SG120-08T/883B Applications
There are a lot of Microsemi SG120-08T/883B Linear Voltage Regulators applications.