I have a 7.4V battery supply which will gradually discharge and reduce until at about 5V I won't have enough power for my device anymore.
Ideally, I need to maintain a 7V (+/- 0.5V) supply rail throughout this time so I've been looking at the MC34064A.
I've used this tool to generate the component values I need.
Simulating the design in Proteus off the 7.4V supply gives me 6.8V with about 100mV of ripple. However, if I then try and run it off 5V this drops dramatically.
So either I've designed my schematic wrong or I'm misunderstanding the function of this IC. Either way could you please advise on how I can obtain a steady 7V rail from a supply that varies from 7.4V to 5V?