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TPS54334 PGOOD Pin Connection

James Rosenthal91
Prodigy 10 points
Other Parts Discussed in Thread: TPS54334

Hello,

Can PGOOD be tied to the TPS54334 output voltage (i.e. the net after the output inductor)?  Or do I need to tie it to the source voltage/a voltage reference?

I am planning to use the TPS54334 to generate a 5V output from a 3S or 4S Lithium Polymer battery back (so Vin=9-18V, roughly).  This input voltage exceeds the maximum rating for PGOOD (6V max, page 4 of the datasheet).

The two options which jump to my mind are: tie PGOOD to the output voltage which will be at 5V, or supply PGOOD with a steady voltage reference that is powered by Vin.  Are either of these options suitable? If not, why not?

I apologize if this question's been answered elsewhere for other regulators.  Hoping to better understand how to use this part and make a successful design.

Thanks for the time and help!
J

  • 0
    TI__Genius 13700 points
    Hello James,

    PGOOD is simply an indicator pin. The datasheet recommends using a 100kohm pull-up resistor to a source marked "VDD" which is not defined as either VIN or VOUT since both can exceed the absolute max for this pin.

    If your design is how you say it is and VOUT is 5V then using a 100kohm resistor to connect PGOOD to VOUT should be fine.

    For futher confirmation if you look at the EVM user guide in figure 18 one of the jumper options is to connect the 100kohm resistor attached to PGOOD to the VOUT net.