• State TI Thinks Resolved
  • Locked Locked
  • Replies 6 replies
  • Answers 2 answers
  • Subscribers 16 subscribers
  • Views 489 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TMUX6219-Q1: Power calculation of the switch

Ena Peh
Prodigy 220 points

Part Number: TMUX6219-Q1
Other Parts Discussed in Thread: TPS61046

Tool/software:

Hi Experts

I am evaluating TMUX6219-Q1 and I have a few queries regarding the power of this IC. 

The VDD will be connected to the output of the boost converter TPS61046 and the output of TPS61046 will also go to the S1 pin of the switch.

1. What is the total power/current dissipation this IC can go? I have concerns of the IC being too hot after reading this thread https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/1296074/tmux6219-running-unexpectedly-hot/4920063?tisearch=e2e-sitesearch&keymatch=tmux6219%20power#4920063. I also tried running the eval board of the TMUX6219-Q1 and it seems to be drawing quite a bit of current. 

2. Do you guys have follow any formula I can look into to calculate the total power disippated for these types of CMOS switches in the future? Thanks so much!

Best Regards

Ena

  • 0
    TI__Mastermind 24985 points

    Hello Ena,

    You can estimate the max power dissipation of the mux by following this FAQ. 

    Following the excel calculator the estimated max power dissipation is 70.6mW. 

    The max junction temperature is 135.7C.

    Thanks,

    Nir 

  • 0 in reply to Nir Gilgur
    Prodigy 220 points

    Hi Nir,

    Thanks for your guidance!

    Based on the excel calculator, am I right to say that I do not have to factor in the specifications of the TPS61046 because this is one of the input to theTMUX6219-Q1 switch and just focus on the specifications of TMUX6219-Q1?

    Best Regards

    Ena

  • 0 in reply to Ena Peh
    Prodigy 220 points

    Is this also related to the power/current consumption of the chip?

  • 0 in reply to Ena Peh
    TI__Mastermind 24985 points

    Hello Ena,

    That is correct, no need to factor in the TPS61046.

    The power consumption of the mux can be found by multiplying the voltage supply by the supply current measured on the supply pin. 

    For 36V supply, the max supply current is 70uA. The max power consumption is then 36 x 70uA = 0.00252W. 

    Thanks,

    Nir 

  • 0 in reply to Nir Gilgur
    Prodigy 220 points

    Hi Nir,

    Thank you so much for your assurance! I connected the TPS61046 eval board to the Vdd and the TMUX6219-Q1 IC and while running yesterday it got really hot. So I was wondering if it drew too much current on the IC.

    In any case when what values of the datasheet should i substitute into the excel calculator? Usually, do I use the values at ambient temperature or do I use the values at max temperature?

    I also understand that changing the frequency of my SEL logic input can affect the current consumption of my IC. May I know why will this happen?

    Thanks again!

    Best Rrgards

    Ena

  • 0 in reply to Ena Peh
    TI__Mastermind 24985 points

    Hello Ena,

    Were you able to record the temperature of the mux? It can handle up to 125C operation temperature. 

    The values are shown and explained in the FAQ. 

    Ron, Icc (Supply current), Vcc (Supply voltage), should be recorded in max values (Ron and Icc in max temp). 
    The excel provides more details on where to find them.

    How does it affect it? Is it greatly increased as the frequency increases? 

    Thanks,

    Nir