RT8020E

® RT8020E Dual High-Efficiency PWM Step-Down DC/DC Converter General Description The RT8020E is a dual high-efficiency Pulse-WidthModulated (PWM) step-down DC/DC converter. It is capable of delivering 1A output current over a wide input voltage range from 2.5V to 5.5V. The RT8020E is ideally suited for portable electronic devices that are powered by 1-cell Li-ion battery or other power sources within the range such as cellular phones, PDAs and other hand-held devices. Two operational modes are available : PWM/Low-Dropout auto-switch mode and shutdown mode. Internal synchronous rectifier with low RDS(ON) dramatically reduces conduction loss at PWM mode. No external Schottky diode is required in practical application. The RT8020E enters Low-Dropout mode when normal PWM cannot provide regulated output voltage by continuously turning on the upper PMOS. The RT8020E enters shutdown mode and consumes less than 0.1μA when the EN pin is pulled low. The switching ripple is easily smoothed-out by small package filtering elements due to a fixed operation frequency of 1.5MHz. This, along with a small WDFN-12L 3x3 package, provides an ideal solution for small PCB area application. Other features include soft start, lower internal reference voltage with 2% accuracy, over temperature protection, and over current protection. Pin Configurations (TOP VIEW) VIN2 1 LX2 2 GND 3 FB1 4 NC1 5 EN1 6 GND 13 12 EN2 11 NC2 10 FB2 9 GND 8 LX1 7 VIN1 WDFN-12L 3x3 Features  2.5V to 5.5V Input Range...