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The RT8023 combines two low dropout (LDO) linear regulators and a step-down converter with an input voltage range of 2.6V to 5.5V. Each output voltage is adjustable from 0.8V to 5V. With independent Enable and Power-Good pins for each regulator, it is easy to control the power up sequence, which is important in some applications.
The LDO has an independent input and is capable of delivering up to 700mA(LDO1) and 350mA(LDO2) output currents with ultra-low dropout. The LDO has high PSRR and can work with low-ESR space saving ceramic capacitors. All these make it Ideal for portable RF and wireless applications with demanding performance and space requirements. Other features include high output accuracy, current limiting protection, and 40μs fast turn-on time.
The step-down converter is a 1.2MHz PWM, current mode converter. Its high switching frequency allows the use of tiny, low cost capacitors and inductors 2mm or less in height. Internal power switches with low on-resistance increase efficiency and eliminate the need for external Schottky diodes. The converter can run at 100% duty cycle for low dropout operation that extends battery life in portable systems.
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  • 转换器输入电压范围 : 2.6V 至5.5V, LDO 输入电压范围 : 2.4V 至5.5V
  • 低噪声LDO 适用于 RF 设计应用中
  • 极快速的输入/负载瞬时响应
  • LDO 导通时间小于40μs
  • LDO只需1μF 的输出稳压电容
  • 电流限制保护
  • 输出最高达1.5A的高效率降压型转压器
  • 1.2MHz 恒定切换频率
  • 内建低 RDS(ON) 开关元件
  • 不需外接萧特基二极管
  • 0.8V的参考电压允许低电压输出
  • 近100%的占空比操作允许输出低压降转换
  • < 2μA 的停机电流
  • 输出电压电源良好信号指示
  • 降压型转压器内建缓启动机制
  • 简易的启动顺序控制
  • 过热保护
  • 短路保护
  • 加强散热特性的24-引脚 WQFN封装
  • 符合RoHS规范与100%的引脚无铅特性
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Portable Instruments Microprocessors and DSP Core Supplies Cellular Phones Wireless and DSL Modems PC Cards Digital Cameras
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