The TPS6215xA-Q1 can be programmed for output voltages from 0.9V to 6V by using a resistive divider from VOUT to AGND. The voltage at the FB pin is regulated to 800mV. The value of the output voltage is set by the selection of the resistive divider from Equation 6 (see Figure 5). It is recommended to choose resistor values which allow a current of at least 2uA, meaning the value of R2 shouldn't exceed 400kΩ. Lower resistor values are recommended for highest accuracy and most robust design. For applications requiring lowest current consumption, the use of fixed output voltage versions is recommended.
In case the FB pin gets opened, the device clamps the output voltage at the VOS pin internally to about 7.4V.