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RT6254 是一款高性能同步降压 DC-DC 转换器,可在 4.5V 至 18V 的输入电压范围下提供最高 4A 的输出电流。产品集成低导通电阻(RDS(ON))功率 MOSFET、精准的 0.6V 基准电压以及自举电路所需的内置二极管,可提供紧凑的电源解决方案。 RT6254 采用先进固定导通时间控制(Advanced Constant On-Time,ACOT®)架构,可提供超高速瞬态响应,同时进一步减少外围元件数量。在稳态运行下,ACOT® 控制能够在输入电压、负载及输出电压变化范围内保持近乎固定的开关频率,从而简化 EMI 滤波器设计。 该产品提供独立的使能控制(EN)输入引脚,便于进行电源时序控制;TSOT-23-8 版本还提供 Power Good 状态指示功能。为控制启动期间的浪涌电流,产品内置固定 1.5ms 软启动(Soft-Start)功能。 RT6254 同时集成完善保护机制,包括逐周期限流保护(Cycle-by-Cycle Current Limit)、输出欠压保护(UVP)、输入欠压锁定保护(UVLO)以及过温保护(OTP),确保系统在各种工作条件下均能安全稳定运行。 RT6254 提供 TSOT-23-6(FC)及 TSOT-23-8(FC)封装。
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<div class="spec-list"><ul class="lv1"><li>4.5V to 18V Input Voltage Range </li><li>4A Output Current </li><li>Constant-on-Time Mode to Enables Fast Transient Response </li><li>Low Output Ripple and Allows Ceramic Output Capacitor </li><li>500kHz Switching Frequency </li><li>High Efficient Internal Power MOSFET Switch Optimized for Lower Duty Cycle Applications </li><li>Integrated 48mΩ/25mΩ MOSFETs </li><li>Internal Soft-Start (1.5ms typ.) </li><li>Built-In UVP/OTP </li><li>Power Good Indicator (90%) </li><li>Input Under Voltage Lockout </li><li>TSOT-23-6 (FC) and TSOT-23-8 (FC) Packages </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>Set Top Box </li><li>Portable TV </li><li>Access Point Router </li><li>DSL Modem </li><li>LCD TV </li></ul></div>
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