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The CMPWR330 is a dual input regulator with a fully integrated VAUX switch capable of delivering up to 400mA continuously at 3.3V. The input is taken from three independent voltage sources on a prioritized basis. Power is always taken in priority using the order of V CC , V SBY , and V AUX . When VCC, (5V) or V SBY is present, the device automatically enables the regulator and produces a stable 3.3V output at V OUT . When only VAUX (3.3V) is present, the device provides a low impedance direct connection (0.25Ω TYP.) from V AUX to V OUT . All the necessary control circuitry needed to provide a smooth and automatic transition between all three supplies has been incorporated. This allows the V CC input supply to be dynamically switched without loss of output voltage. The CMPWR330 is housed in an 8-pin SOIC package and is available with RoHS compliant lead-free finishing. Product services, tools and other useful resources related to CMPWR330 Find and compare products, get support and connect with onsemi sales team.