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Original question:

TPS54622: TPS54622 dynamic management

TPS54622: EN pin connected with open-drain PG of TPS74801

Matt Qi
Intellectual 2690 points
Part Number: TPS54622
Other Parts Discussed in Thread: TPS74801

Hi team,

My customer faced an application of TPS54622 and TPS74801.

TPS74801 outputs the 2.5V and PowerGood, and TPS54622's EN pin is connected with the PowerGood pin of TPS74801.

Because the PowerGood pin of TPS75801 is an open-drain pin, my customer used a pull-up resistor (PR1 in the black-background schematic) at the TPS74801 side, and it is pulled-up to 3.3V.

At the same time, they added an extra pull-down resistor (PR2 in the black-background schematic) at the TPS54622 side.

My question is:

1. Is there any risk using this kind of circuit structure? Or does the values of these two resistors reasonable?

2. If the circuit structure or the values are not suitable, pls recommend any connection method between the TPS74801 (PG) and TPS54622 (EN),

Thanks a lot.

Customer's Application

The description of PG pin of TPS74801

PG pin of TPS74801

  • +1
    TI__Mastermind 30990 points

    Hello, 

     Once the EN pin voltage exceeds the threshold voltage below , the device starts operation. If the EN pin voltage is pulled below the threshold voltage, the regulator stops switching and enters low Iq state. 

    To calculate the PR1 and PR2, you need to use equations 2 and 3 from the datasheet based on the PG pull up voltage you have in your application.  

    Other than this, there is nothing i can see as an issue. buck device, just look EN pin voltage to cross the Rising and falling 

    Thanks

    Tahar