8.3.1 Power Good

The TPS6305x devices have a PG output. The power good goes high impedance once the output is above 95% of the nominal voltage, and is driven low once the output voltage falls below typically 90% of the nominal voltage. The PG pin is an open drain output and is specified to sink up to 0.1 mA. The power good output requires a pullup resistor connecting to any voltage rail less than 5.5 V. The power good is valid as long as the converter is enabled and V_IN is present. The power good goes low when the device is in undervoltage lockout, in thermal shutdown or in current limit.

If EN is pulled low and one of the pins I_LIM0 or I_LIM1 is high, then the PG pin is low. If both pins, I_LIM0 and I_LIM1 are low, the PG is open drain. In this case the PG pin, follows its pullup voltage. If this is not desired, one of the two pins I_LIM0 or I_LIM1, must be set high. Table 1 lists the PG pin functionality.