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RT8239 是雙通道降壓、開關模式電源控制器,用於電池供電系統生成邏輯系統電源。它包含兩組輸出電壓 2V~5.5V 可調的 PWM 控制器和兩組 5V/3.3V 線性穩壓器,其中一個穩壓器(LDO5)具有自動切換開關可將 BYP1 輸入連接至 SMPS1 輸出以實現效率最大化。可選的外部電荷泵電路的輸出可經 SECFB (RT8239 受到監控。還具有片內上電時序管理功能、Power Good 輸出、內部軟啟動功能,還有輸出端關機軟放電功能避免負電壓的出現。它採用固定導通時間控制技術,沒有電流檢測電阻,對負載瞬變具有 100ns 快速回應能力。為了消除音訊應用雜訊,還具有超聲工作模式,可將工作頻率維持在 25kHz 以上。為了獲得最高的轉換效率,它在輕載條件下會自動進入二極體模擬模式工作。SMPS1/SMPS2 的開關切換工作頻率可在 200kHz/233kHz ~ 400kHz/466kHz 之間分別調節。RT8239 的封裝為 QWFN-20L 3x3,可在 -40°C ~ 85°C 的擴展溫度範圍內工作。
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<div class="spec-list"><ul class="lv1"><li>5.5V~25V 輸入電壓範圍 </li><li>2V~5.5V 輸出電壓範圍 </li><li>無需使用電流檢測電阻 </li><li>5V/3.3V 線性穩壓器 </li><li>4700ppm/°C R<sub>DS(ON)</sub> 電流檢測 </li><li>內建電流限制軟啟動和輸出軟放電功能 </li><li>內建 OVP/UVP/OCP </li><li>操作模式選擇和使能控制使用同一端子(RT8239A) </li><li>SECFB 輸入維持電荷泵電壓(RT8239B/C) </li><li>Power Good 指示(RT8239B/C) </li><li>符合 RoHS 規範,不含鹵素 </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>筆記型電腦 </li><li>系統電源 </li><li>3~4芯鋰離子電池供電設備 </li></ul></div>
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