We're looking to utilize the 5156 to boost a Li-on Power Cell (typical operating voltage is 3.3v @ 30A) up to 24v +/-2.0v at 3A for up to 40 seconds, then shuts down. I wanted to enter this data in the 5156 Boost calculator worksheet, but the .zip file won't extract properly. This potential is a 4th try at trying to achieve this with various other architectures that, at least in simulators, seem to work, but all fall terribly short of the output design... rather solidly pointing to the impossibly low resistance requirement of 0.3 ohms in the charge circuit using a 47uH inductor and 60A+ MOSFET. I'm hoping this solution might prove we wasted a lot of time on the first 3 attempts.