This is quite an old chip. Rather use MCP1400, but, I can't get one from anywhere. Mouser.com has it, but you have to buy 1500 pcs, not single pieces.
So, I am thinking of doing a breakout board that step up a 3V input (2xAAA or 2xAA batteries) to output a 5V and 50mA.
I have been reading the below, and can't seem to understand the Ipk (sensing peak current) of pin 7. Is this the current I am to provide or a source current from the IC itself? If I am to provide, I guess I would use the some sort of transistor to have a 220mA current for pin 7. I use a tool to calculate out all the variables to achieve a 50mA/5V output.