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RT5759A 是一款高效能同步降壓 DC-DC 轉換器，可由 3V 至 6.5V 輸入電源提供最高 9A 的輸出電流。輸出電壓可透過 I<sup>2</sup>C 控制的 7-Bits VID，在 0.6V 至 1.725V 範圍內進行可程式設定。<br /><br />此元件整合低 R<sub>DS(ON)</sub> 功率 MOSFET、精準的 0.6V 參考電壓，以及自舉電路的整合式二極體，以提供極為精簡的解決方案。<br /><br />RT5759A 採用先進固定導通時間（Advanced Constant On-Time，ACOT<sup>®</sup>）控制架構，可提供超快速暫態響應，並進一步減少外部元件數量。在穩態下，ACOT<sup>®</sup> 可在線路、負載與輸出電壓範圍內以接近固定的開關頻率運作，使 EMI 濾波器設計更加容易。RT5759A 提供自動 PSM，可在輕載運作期間維持高效率。RT5759A 也可透過 I<sup>2</sup>C 設定在 Forced-CCM 模式下運作，有助於滿足嚴格的電壓調節精度需求。<br /><br />此元件提供多種功能，以提升設計彈性。開關頻率、電流限制位準與過溫臨界值皆可透過 I<sup>2</sup>C 選擇。並提供獨立啟用控制輸入接腳與電源良好指示，以便進行時序控制。此外，設計人員也可透過 I<sup>2</sup>C 介面下達啟用或關斷元件的指令。<br /><br />此元件提供獨立啟用控制輸入接腳與電源良好指示，以便進行時序控制。為控制啟動期間的湧入電流，元件透過連接至 SS 接腳的外部電容提供可程式軟啟動功能。元件亦整合完整的保護功能，包括逐週期電流限制控制、UVP、輸入 UVLO 與 OTP。 <br /><br />RT5759A 提供具備強化散熱能力的 UQFN-13L 3x3 (FC) 封裝。建議接面溫度範圍為 −40°C 至 125°C，環境溫度範圍為 −40°C 至 85°C。
RT5759A 電路圖
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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 訂購資訊
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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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