1.5V to 9V Output

 SLQ20U80P TO-277 Super Low VF 2A@0.25  

2.5V to 9V to 12V Output

 SLQ20U100P TO-277 Super Low VF 2A@0.26

3.5V to 9V to 12V to 20V Output

 SLQ20U120P TO-277 Super Low VF 2A@0.28