If I connect FB pin to output on LT3426 what will happen?
I wonder if I can make 5.5 volts output without adding any resistors?
If you tie the FB pin to the output the LT3426 will not switch, and most of the input source voltage will appear at the output, unregulated.
5.5V is the maximum output you can make with this part, and you have to use a resistor divider to set the output.
So, no, you cannot have 5.5V (or any other output voltage), without using resistors.
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