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RT5788A/B 是一款简单、易于使用的 4A 同步降压 DC-DC 转换器，输入电源电压范围为 2.5V 至 6V。此元件内建精准的 0.6V (±1.5%) 参考电压，并可在 100% 工作周期下作为极低压差稳压器运作。RT5788A/B 整合低 R<sub>DS(ON)</sub> 功率 MOSFET 以达成高效率，并提供 TSOT-23-8 (FC) 封装。 RT5788A/B 采用先进固定导通时间（Advanced Constant On-Time，ACOT<sup>®</sup>）控制架构，可在少量外部元件下提供超快速暂态响应，并在线路、负载与输出电压范围内以接近固定的开关频率运作。RT5788A/B 设计为以 1.5MHz 固定频率运作。RT5788A 会在轻载时自动进入省电模式（PSM）运作，以维持高效率。RT5788B 则在整个负载范围内以 Forced PWM 运作，有助于满足严格的电压调节精度需求。 RT5788A/B 侦测两个 FET 的电流，以提供强健的过电流保护。其可防止元件在输出短路、过电流或电感饱和时遭受灾难性损坏。独立启用控制输入与电源良好指示可提供弹性的系统电源时序控制；内建软启动功能可防止启动期间的涌入电流。此元件亦包含输入欠压锁定、输出欠压保护与过温保护（热关断），以在所有操作条件下提供安全且平稳的运作。
RT5788A/RT5788B 电路图
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<div class="spec-list"><ul class="lv1"><li>4A Converter With Built-In 22mΩ/20mΩ Low R<sub>DS(ON)</sub> Power FETs </li><li>Input Supply Voltage Range : 2.5V to 6V </li><li>Output Voltage Range : 0.6V to 6V </li><li>Operates Up to 100% Duty Cycle </li><li>Advanced Constant On-Time (ACOT®) Control <ul class="lv2"> <li></li><li>Ultrafast Transient Response </li><li>No Needs for External Compensations </li><li>Optimized for Low-ESR Ceramic Output Capacitors </li></ul> </li><li>0.6V ±1.5% High-Accuracy Feedback Reference Voltage </li><li>35mA Operation Quiescent Current (RT5788A) </li><li>Robust Over-Current Protection for Both FETs </li><li>Optional for Operation Modes : <ul class="lv2"> <li></li><li>Power Saving Mode (PSM) (RT5788A) </li><li>Forced PWM Mode (RT5788B) </li></ul> </li><li>Fixed Switching Frequency : 1.5MHz </li><li>Monotonic Start-Up for Pre-Biased Output </li><li>Individual Enable Control Input </li><li>Power Good Indicator </li><li>Built-In Internally Fixed Soft-Start (Typ. 1.5ms) </li><li>100% Duty Cycle Mode </li><li>Internal Output Discharge </li><li>Input Under-Voltage Lockout (UVLO) </li><li>Output Under-Voltage Protection (UVP) with Hiccup Mode </li><li>Over-Temperature Protection </li><li>Available in TSOT-23-8 (FC) Package </li></ul></div>
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RT5788A/RT5788B 订购信息
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<div class="spec-list"><ul class="lv1"><li>WLAN ASIC Power / Storage (SSD and HDD) </li><li>Mobile Phones and Handheld Devices </li><li>STB, Cable Modem, and xDSL Platforms </li><li>General Purpose for POL LV Buck Converter </li></ul></div>
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