Hi Sir
My customer use 3 pcs TPS40304 in their board, and my customer need power sequence function, so they direct connect EN pin to 3.3V.
but this way will case TPS40304 can't be turn on. May you have suggestion for this issue?
we also consider use outside capacitor(SS function), but customer still hope they can use GPIO(open drain) to control.
Bogey
Bogey please refer to page 1 of the datasheet. They can use open drain. The only thing is to follow the config shown. When the gate of the mosfet is low the part is ON. When gate is high part is OFF.
Hi Sir
1. We do not prefer to use NMOS and inverse GPIO signal
Please see the attached is a capture waveform of CPLD initial status.
When the CPLD output will be transient turn on during power on
We worry it will cause some Error
2. If we use PMOS on our design .it have any limitation?
