I have an ICs which has an operating voltage range from 3.35V up to 4.5V. It typically needs a 20-milliamps current but it can have 1.9-amps current peak. Moreover, my system will work with a battery and I therefore must keep the input voltage as little as possible. I do not know well the field of voltage regulators; I thought of using a classical linear voltage regulator or an LDO, but none of them seems to fit my need. Which kind of voltage regulator would you suggest for the above-mentioned design?