This Pololu 5V, 5A Step-Down Voltage Regulator is a step-down (buck) regulator that generates a fixed 5 V output from input voltages up to 38 V.This small synchronous switching step-down (or buck) regulator takes an input voltage of up to 38 V and efficiently reduces it to 5 V. The board measures only 0.7″ × 0.8″, but it allows a typical continuous output current of up to 5 A. Typical efficiencies of 85% to 95% make this regulator well suited for high-power applications like powering motors or servos. High efficiencies are maintained at light loads by dynamically changing the switching frequency, and an optional shutdown pin enables a low-power state with a current draw of a few hundred microamps.VIDEO: ProTip - Soldering Pololu 5v header pinsFeaturesTypical efficiency of 85% to 95%, depending on input voltage and load; the switching frequency automatically changes at light loads to maintain high efficienciesIntegrated reverse-voltage protection, over-current and short-circuit protection, over-temperature shutoff, soft-start, and under-voltage lockoutInput voltage: 6 V to 38 V (see below for more details on the regulator's dropout voltage, which affects the low end of the operating range)700 μA typical no-load quiescent current; can be reduced to 10 µA to 20 µA per volt on VIN by disabling the boardCompact size: 0.7″ × 0.8″ × 0.35″ (17.8 mm × 20.3 mm × 8.8 mm)Typical maximum continuous output current: 5 ATwo 0.086″ mounting holes for #2 or M2 screwsFixed 5 V output (with 4% accuracy)It is a switching regulator (also called a switched-mode power supply (SMPS) or DC-to-DC converter) and has a typical efficiency between 85% to 95%, which is much more efficient than linear voltage regulators, especially when the difference between the input and output voltage is large. The available output current is a function of the input voltage and efficiency (see the Typical Efficiency and Output Current section below), but the output current can typically be as