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The RT8009 is a high-efficiency pulse-width-modulated (PWM) step-down DC-DC converter. Capable of delivering 600mA output current over a wide input voltage range from 2.5 to 5.5V, the RT8009 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 handy-terminals.
Internal synchronous rectifier with low RDS(ON) dramatically reduces conduction loss at PWM mode. No external Schottky diode is required in practical application. The RT8009 automatically turns off the synchronous rectifier while the inductor current is low and enters discontinuous PWM mode. This can increase efficiency at light load condition.
The RT8009 enters Low-Dropout mode when normal PWM cannot provide regulated output voltage by continuously turning on the upper P-MOSFET. RT8009 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 1.25MHz. This along with small SOT-23-5 and TSOT-23-5 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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  • 2.5V 至5.5V输入电压范围
  • 可调输出电压范围 0.5V 至VIN
  • 1.0V, 1.2V, 1.3V, 1.5V, 1.8V, 2.5V 与3.3V 的 恒定/可调 输出电压
  • 600mA 输出电流
  • 效率最高达95%
  • 不需外接萧特基二极管
  • 1.25MHz 定频PWM操作
  • 具有 SOT-23-5 与 TSOT-23-5 两种封装
  • 符合RoHS规范与100%的引脚无铅特性
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Cellular Telephones Personal Information Appliances Wireless and DSL Modems MP3 Players Portable Instruments
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