7.3.15 Power Good (PWRGD Pin)

The PWRGD pin is an open-drain output. When the VSENSE pin is between 94% and 107% of the internal voltage reference, the PWRGD pin deasserts and the pin floats. TI recommends using a pullup resistor between the values of 1 and 100 kΩ to a voltage source that is ≤5.5 V. PWRGD is in a defined state when the VIN input voltage is greater than 1.5 V, but with reduced current-sinking capability. PWRGD achieves full current-sinking capability as the VIN input voltage approaches 3 V.

The PWRGD pin goes low when VSENSE is lower than 92% or greater than 109% of the nominal internal reference voltage. Also, PWRGD goes low if UVLO or thermal shutdown asserts or the EN pin goes low.