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RT5759A 是一款高效能同步降压 DC-DC 转换器，可由 3V 至 6.5V 输入电源提供最高 9A 的输出电流。输出电压可透过 I<sup>2</sup>C 控制的 7-Bits VID，在 0.6V 至 1.725V 范围内进行可程式设定。<br /><br />此元件整合低 R<sub>DS(ON)</sub> 功率 MOSFET、精准的 0.6V 参考电压，以及自举电路的整合式二极体，以提供极为精简的解决方案。<br /><br />RT5759A 采用先进固定导通时间（Advanced Constant On-Time，ACOT<sup>®</sup>）控制架构，可提供超快速暂态响应，并进一步减少外部元件数量。在稳态下，ACOT<sup>®</sup> 可在线路、负载与输出电压范围内以接近固定的开关频率运作，使 EMI 滤波器设计更加容易。RT5759A 提供自动 PSM，可在轻载运作期间维持高效率。RT5759A 也可透过 I<sup>2</sup>C 设定在 Forced-CCM 模式下运作，有助于满足严格的电压调节精度需求。<br /><br />此元件提供多种功能，以提升设计弹性。开关频率、电流限制位准与过温临界值皆可透过 I<sup>2</sup>C 选择。并提供独立启用控制输入接脚与电源良好指示，以便进行时序控制。此外，设计人员也可透过 I<sup>2</sup>C 介面下达启用或关断元件的指令。<br /><br />此元件提供独立启用控制输入接脚与电源良好指示，以便进行时序控制。为控制启动期间的涌入电流，元件透过连接至 SS 接脚的外部电容提供可程式软启动功能。元件亦整合完整的保护功能，包括逐周期电流限制控制、UVP、输入 UVLO 与 OTP。 <br /><br />RT5759A 提供具备强化散热能力的 UQFN-13L 3x3 (FC) 封装。建议接面温度范围为 −40°C 至 125°C，环境温度范围为 −40°C 至 85°C。
RT5759A 电路图
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<div class="spec-list"><ul class="lv1"><li>Dramatically Fast Transient Response </li><li>Steady 1MHz ±20% Switching Frequency </li><li>Advanced COT Control Loop </li><li>Optimized for Ceramic Output Capacitors </li><li>3V to 6.5V Input Voltage Range </li><li>Integrated 12mΩ/8mΩ MOSFETs </li><li>Internal Start-Up into Pre-Biased Outputs </li><li>Power Good Indicator </li><li>Enable Control </li><li>Over-Current and Over-Temperature Protections </li><li>Under-Voltage Protection with Hiccup Mode </li><li>VID Control Range Via I<sup>2</sup>C Compatible Interface: 0.6V to 1.725V step = 12.5mV </li></ul></div>
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RT5759A 订购信息
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<div class="spec-list"><ul class="lv1"><li>Mobile Phones and Handheld Devices </li><li>STB, Cable Modem, and xDSL Platform </li><li>WLAN ASIC Power / Storage (SSD and HDD) </li><li>General Purpose for POL LV Buck Converter </li><li>TV </li></ul></div>
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