ZHCSI22F October 2017 – December 2021 TPS2662
When the voltage at UVLO pin falls below V(UVLOF) during input power fail or input undervoltage fault, the internal FET quickly turns off and FLT is asserted. The UVLO comparator has a hysteresis of 100 mV. To set the input UVLO threshold, connect a resistor divider network from IN supply to UVLO terminal to RTN as shown in Figure 9-1.
If the Undervoltage Lockout function is not needed, the UVLO terminal must be connected to the IN terminal with a 1-MΩ resistor. UVLO pin is 5-V rated and this resistor limits the UVLO pin current to < 60 µA. The UVLO terminal must not be left floating.