The PGOOD pin is an open drain output. After feedback voltage of each buck is between 95% (rising) and 105% (falling) of the internal voltage reference, the PGOOD pin pull-down is de-asserted and the pin floats. It is recommended to use a pull-up resistor between the values of 10kΩ and 100kΩ to a voltage source that is 5.5V or less. The PGOOD is in a defined state after the VIN input voltage is greater than 1V, but with reduced current sinking capability. The PGOOD achieves full current sinking capability after the VIN input voltage is above UVLO threshold, which is 4.25V.

The PGOOD pin is pulled low when any feedback voltage of a buck is lower than 92.5% (falling) or greater than 107.5% (rising) of the nominal internal reference voltage. Also, the PGOOD is pulled low if the input voltage is undervoltage locked up, thermal shutdown is asserted, the EN pin is pulled low or the converter is in a soft-start period.