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RT6338 系列是高效率同步降压 DC-DC 转换器，具备 500kHz 伪恒定开关频率，并可提供高达 8A 的输出电流。RT6338 可在 4.5V 至 23V 输入电压下运行。RT6338 的输出电压固定为 3.36V 输出电压。<br /><br />RT6338 采用 Advanced Constant On-Time (ACOT<sup>®</sup>) 控制架构，可提供超快速瞬态响应，并进一步减少外部元件数量。在稳态下，ACOT<sup>®</sup> 可在输入电压、负载与输出电压范围内以近乎恒定的开关频率运行，并使 EMI 滤波器设计更加容易。<br /><br />通过设置 EN/MODE 引脚的电压，RT6338 可在轻载时以二极管仿真模式 (DEM) 或超声波模式 (USM) 运行。USM 可保持运行频率高于 25kHz，从而消除声学噪声。在 DEM 中，RT6338 可提供最佳轻载效率，并通过扩频功能改善声学噪声。<br /><br />RT6338 提供 PGOOD 指示器，便于系统时序控制。该器件亦集成完整保护功能，包括逐周期电流限制、OVP、UVP、输入 UVLO 与 OTP。<br /><br />上述所有功能均集成于 UQFN-23L 3x3 (FC) 封装中。
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<div class="spec-list"><ul class="lv1"><li>Input Voltage Range <ul class="lv2"> <li></li><li>RT6338E/EH: 4.5V to 23V </li></ul> </li><li>Output Voltage <ul class="lv2"> <li></li><li>RT6338E/EH: 3.36V </li></ul> </li><li>8A Continuous Output Current </li><li>Stable with POSCAP and MLCC Capacitor </li><li>Fast Transient Response </li><li>Diode Emulation Mode (DEM) for Power Saving </li><li>Ultrasonic Mode (USM) for Avoiding Acoustic Noise </li><li>Pseudo Constant Switching Frequency 500kHz in CCM </li><li>Internal Power MOSFET Switch 26mΩ (high-side) and 14mΩ (low-side) </li><li>LDO <ul class="lv2"> <li></li><li>RT6338E/EH: 3.3V/100mA </li></ul> </li><li>Overcurrent Limit <ul class="lv2"> <li></li><li>RT6338E/EH: 12A </li></ul> </li><li>Output Under-/Overvoltage Protection (UVP/OVP) <ul class="lv2"> <li></li><li>RT6338E: Latched Mode UVP/OVP </li><li>RT6338EH: Hiccup Mode UVP and Non-Latched Mode OVP </li></ul> </li><li>Input Undervoltage Lockout (UVLO) </li><li>Over-Temperature Protection (OTP) <ul class="lv2"> <li></li><li>RT6338E: Latched Mode OTP </li><li>RT6338EH: Non-Latched Mode OTP </li></ul> </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>Laptop Computers </li><li>Tablet PCs </li><li>Networking Systems </li><li>Servers </li><li>Personal Video Recorders </li><li>Flat Panel Television and Monitors </li><li>Distributed Power Systems </li></ul></div>
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