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TPS65265: Power Good Individual Feature

vikas gupta1
Intellectual 525 points
Part Number: TPS65265
Other Parts Discussed in Thread: TPS65400

Hi,

We are using TPS65265 for triple output needs, I see the IC supports 3 EN pins, which we can use for sequencing, but our requirement also asks us to have 3 separate PowerGOOD pins, is there any way we can achieve in this IC. Or if not is there any other recommendation to have 3 EN pin and 3 PG pin feature.

Thanks

Vikas G.

  • 0
    TI__Genius 15135 points

    Hi, Sir

    TPS65265 cannot support 3 power good outputs.

    Recommend to use TPS65400 which is a 4 channel buck converter, it can support 4 seperated power good outputs, but you need to configure SSx/PGx pin to power good function by I2C.  

    Besides, if you don't need 4th buck converter, you can disable it.  

     

     

  • 0 in reply to Zhao Ma
    Intellectual 525 points

    Thanks Zhao,

    TPS65265 i would like to know anyway we can use one PG pin for individual output confiuration. As i Understand when all 3 outputs come then only it send PG signal out. Our requirement is Enable one Buck and corresponding PG go to the sequencer IC , and same way 2nd and 3rd. Any suggestions. 

    I beleive TPS65400 is little bigger and we have space constraint to have that too.Also we not needed additonal I2C /PMBus interface which increases more cost and complexity, is there any existing solution available or worst case we have to go for TPS65400 only.

    Thanks

    Vikas G.

  • 0 in reply to vikas gupta1
    TI__Genius 15135 points

    Hi, Sir

    1. The PGOOD is AND logic of 3 channel output, only when all of 3 outputs startup, the PGOOD will output high.  

    If one of channels is disabled, the PGOOD will keep low.

    You can refer page 4 of tps65265 datasheet, PGOOD pin description.

    "An open drain output, asserts low if output voltage of any buck beyond regulation range due to thermal shutdown, over-current, under-voltage or ENx shut down."

    2. There is no existing solution available for TPS65400.

    If you don't want to use the I2C, you can burn the program into TPS65400 to configure SSx/PGx pin to PGOOD function.