I wish I had seen the LM1084 before; it can handle 5V up to 5A
Just be aware that if you're starting with 12V VIN then the regulator is going to dissipate roughly 5W with 700mA out (from your other thread).
Pd = (12V-5V) x 0.7 = 4.9W

That's going to get quite hot... over 100degC rise depending on the package type.