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Want to use the IC over the range 400mV to 30V but normally 6V-10Vin and 7Vout

Thread Summary

The user inquired about using the MAX20048 in a vintage car dynamo system with a 400mV input, which is below the minimum operating voltage. The support engineer confirmed that the IC can operate down to 2V after initial startup with 5V, and suggested using a mechanical relay to supply the dynamo field until 5V is available. The input current is current-limited, but the voltage rise due to the input diode is manageable. Other ICs like the LTC3789 and LM51772 were also considered, but the MAX20048 is the most suitable for the application.
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Category: Hardware
Product Number: MAX20048

The power input starts at 400mV and is also supplied with 5V at the IN pin to power the MAX20048 internal circuitry.

https://blog.andrew-lohmann.me.uk/2025/09/vintage-and-veteran-car-dynamo-power.html

So 400mV is below the minimum operating voltage so some of the functions, I guess may not work, but if enough function do for example the input current does not create an over current signal then the power supply may work fine.  Can you tell me if this is possible?

The application is for a vintage or veteran car electrical system so that the dynamo can be used and more of the power generated normally not used can be used.  It would be for 12V or 6V car.