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Pololu Step-Up/Step-Down Voltage Regulator S7V7F5

Vendor's Description: 

The S7V7F5 switching step-up/step-down regulator efficiently produces 5 V from input voltages between 2.7 and 11.8 V. Its ability to convert both higher and lower input voltages makes it useful for applications where the power supply voltage can vary greatly, as with batteries that start above but discharge below 5 V. The very compact (0.35″ × 0.475″) module can supply up to 1 A when stepping down and about 500 mA when stepping up.