RT8020 - Dual High-Efficiency PWM Step-Down DC/DC Converter
The RT8020 is a dual high-efficiency Pulse-Width-Modulated (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 RT8020 is ideally suited for ,portable electronic devices that are powered from 1-cell Li-ion battery or from ,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 and shutdown modes. Internal synchronous rectifier with low RDS(ON) ,dramatically reduces conduction loss at PWM mode. No external Schottky diode is ,required in practical application.,,The RT8020 enters Low-Dropout mode when normal PWM cannot provide regulated ,output voltage by continuously turning on the upper PMOS. The RT8020 enter ,shutdown mode and consumes less than 0.1μA when 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 small ,WDFN-12L 3x3 package provides small PCB area application. Other features ,include soft start, lower internal reference voltage with 2% accuracy, over ,temperature protection, and over current protection.
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