Digital Voltage Selection Control for L200 Regulator

This is digital voltage selection control circuit. This circuit uses L200 Regulator. It can be used to regulated the output voltage digitally. Here is the circuit :

A combination of P2, R3, R2, and R1 with R5 form voltage divider that determine the output voltage.  The transistor is used to switched off this circuit. The output voltage does not exceed 0.45 V and pin 2 is brought to ground potential, when the inhibit transistor is saturated. [Source: STMicroelectronics Application Note]