Category: Hardware
Product Number: LTC3649
I'm working on a design to generate a positive and negative voltage with high current requirements using the LTC7149 and the LTC3649 ICs. I'm still designing, but my question pertains to the PGDFB and PGOOD pins. If you don't need to use them, what do you do with the pins? Do you leave them floating, or do you have to tie them to something?
In the LTspice example, they had it with PGDFB wired to the output and PGOOD left floating. The datasheet says that the voltage at the PGDFB pin VPGDFB voltage is measured with respect to VOUT. So, it sounds like if PGDFB is tied to VOUT, PGOOD will never become positive and remain at 0.