SNVSB77B December 2019 – September 2021 TPSM53603
The TPSM53603 has a built-in power-good signal (PGOOD) which indicates whether the output voltage is within its regulation range. The PGOOD pin is an open-drain output that requires a pullup resistor to a nominal voltage source of 18 V or less. The internal 5-V LDO output (V5V pin) can be used as the pullup voltage source. A typical pullup resistor value is between 10 kΩ and 100 kΩ. The maximum recommended PGOOD sink current is 3 mA.
Once the output voltage rises above 94% of the set voltage, the PGOOD pin rises to the pullup voltage level. The PGOOD pin is pulled low when the output voltage drops lower than 92% or rises higher than 107% of the nominal set voltage. See Figure 7-6 for typical power-good thresholds.