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Pololu Step-Down Voltage Regulator D15V35F5S3

Vendor's Description: 

The compact (1.68"×0.46") D15V35F5S3 switching step-down (or buck) voltage regulator takes an input voltage between 4.5 and 24 V and efficiently reduces it to a lower, user-selectable voltage. The selectable output voltages are 5 and 3.3 V, and it can deliver up to 3.5 A continuous in typical applications.