RT8025是一种高效(PWM)降压直流-直流转换器。RT8025能提供400毫安输出电流在很宽输入电压范围从2.5至5.5V,RT8025适合便携式电子设备,从1-cell提供动力锂电池或其它电源范围内高水平的产品如:手机、pda和handy-terminals。RT8025内部同步整流器与低关系型数据库(在)传导损失戏剧性地减少PWM方式。RT8025没有外部置肖特基二极管

The RT8025 is a high-efficiency pulse-width-modulated (PWM) step-down DC-DC converter. Capable of delivering 400mA output current over a wide input voltage range from 2.5 to 5.5V, the RT8025 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 R_DS(ON) dramatically reduces conduction loss at PWM mode. No external Schottky diode is required in practical application. The RT8025 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 RT8025 enters Low-Dropout mode when normal PWM cannot provide regulated output voltage by continuously turning on the upper P-MOSFET. RT8025 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.

RT8025应用领域
• Cellular Telephones
• Personal Information Appliances
• Wireless and DSL Modems
• MP3 Players
• Portable Instruments

RT8025技术特性
• 2.5V to 5.5V Input Range
• Adjustable Output From 0.5V to VIN
• 1.0V, 1.2V, 1.3V, 1.5V, 1.8V, 2.5V and 3.3V Fixed/Adjustable Output Voltage
• 400mA Output Current
• 95% Efficiency
• No Schottky Diode Required
• 1.25MHz Fixed-Frequency PWM Operation
• Small SOT-23-5 and TSOT-23-5 Package
• RoHS Compliant and Halogen Free