LT8410-1 Booster Circuit Current Draw

Hi,

I'd like to get some support regarding Linear's LT8410-1 boost converter. 

More specifically I am measuring a large disrepancy between simulated current consumption (using LTspice) and the reality of my circuit. 

To be more precise the boost converter is set to convert about 3.4V to 13.25V or 26.5V. I am measuring about 150uA current drawn from my supply in the first case and about 3mA in the second case. LTspice simulates an average current draw of ~130uA in the first case and about 250uA in the second case. 

The situation is a bit more complicated but I would like to discuss this in private if possible with one of the support engineers.

Thank you for any support.

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  • I do not see any circuits/schematics attached to the message. The LT8401 you are discussing now I assume is a typo, and you really mean LT8410-1 as in your original message. 

    The LT8410-1 has only 6mA of switch guaranteed current, about 8mA typical. I am not surprised you are seeing about 3mA current draw from your battery. I am surprised the output voltage is able to increase to 105V, as you report. 

    If you can send at least the simulation you are using, I will take a look. What I suspect now is that your circuit is running at current limit, just trying to keep the output up, and the switching frequency is probably >1MHs, maybe 2MHz. If that's the case, then, the average input will be high, as you report.

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  • I do not see any circuits/schematics attached to the message. The LT8401 you are discussing now I assume is a typo, and you really mean LT8410-1 as in your original message. 

    The LT8410-1 has only 6mA of switch guaranteed current, about 8mA typical. I am not surprised you are seeing about 3mA current draw from your battery. I am surprised the output voltage is able to increase to 105V, as you report. 

    If you can send at least the simulation you are using, I will take a look. What I suspect now is that your circuit is running at current limit, just trying to keep the output up, and the switching frequency is probably >1MHs, maybe 2MHz. If that's the case, then, the average input will be high, as you report.

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