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TCAN1044AV-Q1: Max Current Draw

Jason Maxwell
Prodigy 545 points

Part Number: TCAN1044AV-Q1

Hi Team,

I have a customer who is looking to use the TCAN1044AV-Q1, but they are concerned with the 6V max supply voltage:

They would like to have a little bit higher ceiling on the input. I have suggested that they use a resistor and zener diode circuit to go from input to the device. They asked me for an example recommendation for the zener and resistor. As I looked in to this, I realized that I needed to know the max current draw from the TCAN1044AV-Q1. I'm sure it's in the datasheet, but I can't find it. So could you tell me what the max current going into this device is? Thanks in advance!

Best,

Jason Maxwell

  • +1
    TI__Guru 50835 points

    Hi Jason, 

    The maximum current draw from the Vcc pin is the Dominant with bus fault condition at 130mA. For industrial applications with high voltage concerns we may recommend the older TCAN1042. While this device does not have as good of a cost structure, it does provide an absolute maximum Vcc voltage of 7V and a much higher bus fault voltage of +-70V

    What situation does the customer expect that the Vcc rail will exceed 6.0V? Is this supply coming from a voltage regulator that could lose regulation or is there some off-board supply they are trying to use? It is not typical for me to see unstable Vcc supplies, more often it is the battery supply we are concerned about. 

    Let me know if you have any more questions. 

    Regards, 
    Eric Schott

  • 0 in reply to Eric Schott1
    TI__Prodigy 545 points

    Hi Eric,

    The EE is a motor driver and the supply is coming from off-board (various different user use-cases). 

    Thanks for sending the max current draw. 

    From the customer: "The supply is regulated, but the user has various unknown devices on the 5V rail as well, and they could potentially kick disturbances back."

    Best,

    Jason Maxwell