I have a LT8607 DFN on a new custom board. Input 12v, output 5v, 4.7uh, 10uf in/out, 40k rt, 249k/50k feedback. EN is about 2v. The output ramps up to about 1v in 10ms and does not go higher. This means the startup current is limited to less than 5ma. Occasionally, cycling EN will cause it to work properly.