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RT8056為高效率脈波寬度調變(PWM)的雙通道同步降壓型 DC/DC 轉換器。輸入範圍2.8V 至5.5V時,輸出電流可達1A。RT8056適用于由單一鋰電池供電的可攜式電子裝置,例如行動電話、PDA、PC WLAN卡與掌上型裝置。RT8056提供了兩種操作模式:PWM/低壓降自動切換模式與關機模式。內部的低R<sub>DS(ON)</sub>同步整流元件降低了操作在PWM模式的的導通損耗,且不需外加蕭特基二極體於實際設計中。RT8056當PWM操作時無法連續導通上端P-MOSFET時,進入低壓降模式。當EN腳位為低電位時,進入關機模式,消耗電流小於0.1μA。由於操作在固定頻率1.5MHz,可由較小封裝的元件進行濾波設計得到較平滑的切換漣波。
RT8056 電路圖
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<div class="spec-list"><ul class="lv1"><li>2.8V 至 5.5V 的輸入電壓範圍 </li><li>1.5MHz 定頻PWM操作 </li><li>2 x 1A輸出電流 </li><li>效率達95% </li><li>不需外加蕭特基二極體 </li><li>0.6V 的參考電壓允許低電壓輸出 </li><li>低壓降操作 : 100% 的責任週期 </li><li>10-接腳 的WDFN 封裝 </li><li>符合RoHS規範與無鹵特性 </li></ul></div>
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RT8056 訂購資訊
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<div class="spec-list"><ul class="lv1"><li>Portable Instruments </li><li>Microprocessors and DSP Core Supplies </li><li>Cellular Phones </li><li>Wireless and DSL Modems </li><li>PC Cards </li><li>Set Top Box </li></ul></div>
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