Do you want a chip using a power of 3.3v for itself, or to ooutput
to the motors?
Anyway many chips can work in a range of power from a minimum to
a maximum. You can verify on the L293D datasheet what is its minimum
Or you can use special chip to transform 3.3 to 5v.
Pololu makes several low voltage motor drivers like:
You might want to check them out...
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