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5. Power Good function is different for both devices:
TPS61251
PG is set high if the feedback voltage reaches 95% of its nominal value.
The PG comparator operates even in shut down mode when EN is set to low and/or VIN is turned off. This guaranties power good functionality until the capacitor is discharged.
The PG output goes low when:
Vout < 2.3 V and indicates the discharge of the capacitor.
Vout < 2.0 V all internal circuitry is disabled. Therefore the PG open drain output becomes high resistive and follows the voltage the pull-up resistor is connected to.
While the output capacitors are still charged the converter can be disconnected from its supply but it will still supply a follow-on circuitry with energy needed for a secured shut down.
