The PGOOD pin is an open-drain output requiring an external pullup resistor to output a high signal. After the FB pin is between 92% and 108% of the internal voltage reference, soft start is complete, and after a 256-µs deglitch time, the PGOOD pin is de-asserted and the pin floats. TI recommends a pullup resistor between the values of 10 kΩ and 100 kΩ to a voltage source that is 5.5 V or less. PGOOD is in a defined state after the VIN input voltage is greater than 1 V but with reduced current sinking capability. When the FB is lower than 84% or greater than 116% of the nominal internal reference voltage, after a 8-µs deglitch time, the PGOOD pin is pulled low. PGOOD is immediately pulled low if VIN falls below its UVLO, the EN pin is pulled low or the device enters thermal shutdown.