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TPS92682-Q1: Supply switching current Inquiry

Renan Santos Adriano
Genius 16540 points
Part Number: TPS92682-Q1

Hi Team,

My Customer wanted to know since the Supply switching current (I_in-sw) is announced as 10mA (page 6 datasheet) when both channels are switching. What is the current consumption if only one channle is used (with SPI communication)? Is it the same as this value even only one channel is used?

Looking forward to your input.

Regards,
_Renan

  • 0
    TI__Intellectual 2580 points

    Renan,

    The switching current of any switching controller IC is a function of the external MosFET total gate charge and the switching frequency. 

    This particular specification is simply showing a nominal value at the conditions given at the top of the ECtable in the datasheet.  Those conditions indirectly specify the switching frequency of both channels and the capacitive load at the GATE pin during the testing. 

    Also, the previous spec, Istandby current is typical 2.3mA.  So, the best way for the customer to calculate their own total IC current during switching operation is to use the following equation:

    Isw = Qg*fsw where Qg is the total gate charge of the external MosFET and Fsw is the switching frequency

    If both channels were used then the Isw calculation is done for each channel.  In their case, they are obviously only using one channel.

    So in their case, the total current drawn by the TPS92682 would then be Itot = Isw+Istandby.

    -JP