The TPS566231P and TPS566238P have the PG pin as a power-good indicator. The PG pin is an open-drain output. After the V_FB is between 90% and 110% of the internal reference voltage (V_REF), the PG is de-asserted and floats after a 1-ms de-glitch time. TI recommends a 100-kΩ pullup resistor to pull the voltage up to VCC. The PG pin is pulled low when:

• The FB pin voltage is lower than 85% or greater than 115% of the target output voltage
• The device is in an OVP, UVP, or thermal shutdown event
• Or during the soft-start period