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GSM modems have become popular as a wireless data transfer solution; however, they frequently require large bursts of current that exceed the maximum input current available to the voltage regulator. Many can be powered from a USB port (4.5V to 5.5V input) or a PCMCIA port (3V to 3.6V input), where 3.xV is required to supply the RF power amplifier that draws current pulses up to 2A. Since the input from the USB or PCMCIA port is current limited to 500mA, a high efficiency Buck-Boost converter with input current limit provides the best power supply solution. High efficiency maximizes the average output power, while a bulk output capacitor is used to maintain the voltage during the high current pulses.