The TPS6282x has a built-in power good (PG) function. The PG pin goes high impedance when the output voltage has reached its nominal value. Otherwise, including when disabled, in UVLO or in thermal shutdown, PG is Low (see Table 8-1). The PG function is formed with a window comparator, which has an upper and lower voltage threshold. The PG pin is an open-drain output and is specified to sink up to 1 mA. The power good output requires a pullup resistor connecting to any voltage rail less than 5.5 V.
The PG signal can be used for sequencing of multiple rails by connecting it to the EN pin of other converters. Leave the PG pin unconnected when not used. The PG rising edge has a 100-µs blanking time and the PG falling edge has a deglitch delay of 20 µs.
|DEVICE CONDITIONS||LOGIC STATUS|
|Enable||EN = High, VFB ≥ 0.576 V||√|
|EN = High, VFB ≤ 0.552 V||√|
|EN = High, VFB ≤ 0.63 V||√|
|EN = High, VFB ≥ 0.66 V||√|
|Shutdown||EN = Low||√|
|Thermal Shutdown||TJ > TJSD||√|
|UVLO||0.7 V < VIN < VUVLO||√|
|Power Supply Removal||VIN < 0.7 V||√|