ZHCSEM3D February 2016 – November 2018 TPS82130
The output voltage is set by an external resistor divider according to the following equations:
R2 should not be higher than 100kΩ to achieve high efficiency at light load while providing acceptable noise sensitivity. Larger currents through R2 improve noise sensitivity and output voltage accuracy. Figure 5 shows the external resistor divider value for a 1.8-V output. Choose appropriate resistor values for other outputs.
In case the FB pin gets opened, the device clamps the output voltage at the VOUT pin internally to about 7V.