This document describes the features and technical specifications of the ADP2164 high-efficiency step-down DC-to-DC regulator, including 4A continuous output current, integrated FETs with low resistance, ±1.5% output accuracy, input voltage range of 2.7V to 6.5V, output voltage range of 0.6V to VIN, selectable fixed or adjustable switching frequency, synchronization capability, precision enable input, power-good output, voltage tracking input, integrated soft start, internal compensation, and various protection features.