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These boost (step-up) voltage regulators generate higher output voltages from input voltages as low as 2.5 V. They are switching regulators (also called switched-mode power supplies (SMPS) or DC-to-DC converters) and have a typical efficiency between 80% to 90%.
The available output current is a function of the input voltage, output voltage, and efficiency. The input current can typically be as high as 1.4 A.