Transports electrons between ferredoxin and NADPH. H(+) + NADP(+) + 2 reduced [2Fe-2S]-[ferredoxin] = NADPH + 2 oxidized [2Fe-2S]-[ferredoxin] Monomer. Overexpressed under N(2)-fixing conditions. Belongs to the ferredoxin--NADP reductase type 1 family.