SBVS342A February 2019 – March 2019 TPS7A16A-Q1
The power-good delay time (tDELAY) is defined as the time period from when VOUT exceeds the PG trip threshold voltage (VIT) to when the PG output is high. This power-good delay time is set by an external capacitor (CDELAY) connected from the DELAY pin to GND; this capacitor is charged from 0 V to ap 1.8 V by the DELAY pin current (IDELAY) once VOUT exceeds the PG trip threshold (VIT).
When CDELAY is used, the PG output is high-impedance when VOUT exceeds VIT, and VDELAY exceeds VREF.
The power-good delay time can be calculated using: tDELAY = (CDELAY × VREF)/IDELAY. For example, when CDELAY = 10 nF, the PG delay time is approximately 12 ms; that is, (10 nF × 1.193 V) / 1 µA = 11.93 ms.