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TPS3840-Q1: Clarification of behavior of supply current at point of transition

Part Number: TPS3840-Q1
Other Parts Discussed in Thread: TPS3840

Section 7.7 of the datasheet shows several figures (Figure 7 through 9) of supply current vs supply voltage at different operating temperature points.

All of these curves do not show a spike (or dynamic change) at the point of passing through the threshold of Vit-.

Is this an omission, or truly there is negligible increased current draw at this point (either negative going or positive going through Vit-)?

When the TPS3840 is connected directly to a supply rail (no resistor divider), this is not as important.  However, if a resistor divider is used with high-value resistors when monitoring a high voltage, a spike of current at the transition point could cause oscillations.

Is there additional information that can be shared about the behavior of the supply current at this point:?

  • Hi Brandon,

    As far as I am aware, the data is taken directly from test and implemented into datasheet graphs: the graphs should represent the exact behavior we noticed in testing for this device. That being said, it is possible that the transients noticed at the “knee” of the graph were filtered out. I will forward this inquiry to design to see if they have any input on how our device performs at the inflection point. Let's close over email.

    Thanks,
    Abhinav.