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I am developing a lithium battery charger and I've been thinking about using a constant current source for a faster charging, since with constant voltage is a bit slow. I will be charging at about 700mA, being quite high for a liner regulator, so I have found the LM2576. However, as a current source varies the voltage to maintain the current, I don't know if I need a step-up or step-down converter, or one having both. I have an input voltage of 4.2V and the battery will between 3.5V and 4.2V. I suppose that I need a higher voltage than 4.2V to have a high charging current.