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The MIC4721 is a high efficiency PWM buck (step-down) regulator that provides up to 1.5A of output current. The MIC4721 operates at 2MHz and has proprietary internal compensation that allows a closed loop bandwidth of over 200kHz. The low on-resistance internal P-Channel MOSFET of the MIC4721 allows efficiencies up to 94%, reduces external component count and eliminates the need for an expensive external current sense resistor. The MIC4721 operates from a 2.7V to 5.5V input and its output is adjustable down to 1V. The devices can operate with a maximum duty cycle of 100% for use in low-dropout applications.