MCP1755 has Power Good Output (PWRGD) output pin which is open drain. In page 15 of data-sheet it says
The PWRGD pin may be pulled up to VIN or VOUT. Pulling up to VOUT conserves power when the device is in Shutdown (SHDN = 0V) mode.
1) How should I connect this pin. Should I leave it as not connected or pull it up to Vout pin with 10K. (I will not monitor the operation of converter I want only proper 3.3v regulation).
2) What is the exact purpose of this pin. Should we connect it to an ADC to see the operating condition if we want.
Best Answer
Connect it through 10k to Vout. The pin is just a logic output, you can see from the second block diagram on page 3 of your datasheet that it's the output of a comparator. It would not be connected to an ADC. The pin could be used to drive a LED, the datasheet shows that it has sufficient current capability: 1mA is enough for an indicator.