Andrew Cowan
Senior Member
I am looking at the pinout of a 5V voltage regulator on the datasheet for the mcp1824t-0802e/ot. That regulator is great, as it has very low dropout. The legs are:
1)Vin
2)GND
3)SHDN
4)PWRGD
5)Vout
I have never come across SHRN and PWRGD before. In the typical applications section, SHRN seems to be an on off control - I can cope with this. PWRGD (I assume Power Good) is connected to Vout via a 100K resistor - what does this do?
Thanks,
Andrew
Edit:
From the datasheet:
3.5 Power Good Output (PWRGD) For fixed applications, the PWRGD output is an opendrain output used to indicate when the LDO output voltage is within 92% (typically) of its nominal regulation value. The PWRGD threshold has a typical hysteresis value of 2% The PWRGD output is delayed by 110 μs (typical) from the time the LDO output is within 92% + 3% (maximum hysteresis) of the regulated output value on power-up. This delay time is internally fixed.
I still don't understand!
1)Vin
2)GND
3)SHDN
4)PWRGD
5)Vout
I have never come across SHRN and PWRGD before. In the typical applications section, SHRN seems to be an on off control - I can cope with this. PWRGD (I assume Power Good) is connected to Vout via a 100K resistor - what does this do?
Thanks,
Andrew
Edit:
From the datasheet:
3.5 Power Good Output (PWRGD) For fixed applications, the PWRGD output is an opendrain output used to indicate when the LDO output voltage is within 92% (typically) of its nominal regulation value. The PWRGD threshold has a typical hysteresis value of 2% The PWRGD output is delayed by 110 μs (typical) from the time the LDO output is within 92% + 3% (maximum hysteresis) of the regulated output value on power-up. This delay time is internally fixed.
I still don't understand!
Last edited: