RY3420

RY3420 5.5V 2A 1.2MHz Synchronous Step-Down Regulator Features • • • • • • • • • • • High Efficiency: Up to 96% 2.5V to 5.5V Input Voltage Range 1.2MHz Constant Frequency Operation No Schottky Diode Required Low Dropout Operation: 100% Duty Cycle PFM Mode for High Efficiency in Light Load • Over Temperature Protected Low Quiescent Current: 40μA Short Circuit Protection Inrush Current Limit and Soft Start 2A Continuous Output Current SOT23-5 package Applications • • • • • Cellular and Smart Phones Wireless and DSL Modems PDAs • Portable Instruments Digital Still and Video Cameras PC Cards General Description The RY3420 is a high-efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version. Supply current with no load is 40uA and drops to