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 1). The PG function is formed with a window comparator, which has an upper and lower voltage threshold (see Electrical Characteristics). The PG pin is an open drain output that requires a pull-up resistor and can sink up to 1mA. If not used, the PG pin can be left floating or connected to GND.
|Device State||PG Logic Status|
|Enable (EN=High)||VFB ≥ VPGTL and VFB ≤ VPGTH||√|
|VFB ≤ VPGTL or VFB ≥ VPGTH||√|
|UVLO||0.7 V < VIN < VUVLO||√|
|Thermal Shutdown||TJ > TSD||√|
|Power Supply Removal||VIN < 0.7 V||√|
At startup, PG transitions from low to floating about 100µs after the output voltage has reached regulation. Once in operation, PG has a deglitch delay of about 20µs before going low. When the output voltage returns to regulation, the same 100µs delay occurs.