<div class=WordSection1><p style="padding-top: 1rem;">立錡提供多樣化的升壓轉換器解決方案，以滿足不同應用需求。本篇應用筆記將探討多項熱門升壓轉換器的主要特性與應用範例，幫助工程師在不同應用中，選擇最合適的產品，確保系統的高效能與穩定性。</p></div><br><div class=WordSection2><h2 id=“__Bookmark__0”>1 升壓轉換器的選擇考量</h2><p class=MsoNormal>在不同應用中，選擇適合的升壓轉換器需要綜合考量以下因素：輸入輸出電壓範圍、靜態電流與功率、控制介面、包裝與成本。以下列表為立錡推出的熱門升壓轉換器產品，依據功能與架構分為 4 大類和分別的產品，具有旁路開關架構，以 I²C 介面控制的 RT4803/RT4803A/RT4803B 系列、低靜態電流 RT4823<sapn>、簡易設計</sapn> RT4812<span>，以及高壓輸出產品</sapn> RT8581。</p><table class=MsoTableGrid border=1 cellspacing=0 cellpadding=0 width=1021 style='border-collapse:collapse;border:none'><tr style='height:17.0pt'><td width=122 style='width:60.8pt;border:solid windowtext 1.0pt;background: #D9D9D9;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'></td><td width=431 colspan=3 style='width:215.7pt;border:solid windowtext 1.0pt; border-left:none;background:#D9D9D9;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>With Bypass MOSFET</p></td><td width=137 style='width:68.6pt;border:solid windowtext 1.0pt;border-left: none;background:#D9D9D9;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>Easy Design</p></td><td width=132 style='width:65.75pt;border:solid windowtext 1.0pt;border-left: none;background:#D9D9D9;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>Low Iq</p></td><td width=128 style='width:63.8pt;border:solid windowtext 1.0pt;border-left: none;background:#D9D9D9;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>High Vout</p></td></tr><tr style='height:17.0pt'><td width=122 style='width:60.8pt;border:solid windowtext 1.0pt;border-top: none;background:#D9D9D9;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'></td><td width=149 style='width:74.55pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; background:#D9D9D9;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>RT4803</p></td><td width=140 style='width:70.0pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; background:#D9D9D9;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>RT4803A</p></td><td width=142 style='width:71.15pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; background:#D9D9D9;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>RT4803B</p></td><td width=137 style='width:68.6pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; background:#D9D9D9;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>RT4812</p></td><td width=132 style='width:65.75pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; background:#D9D9D9;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>RT4823</p></td><td width=128 style='width:63.8pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; background:#D9D9D9;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>RT8581</p></td></tr><tr style='height:17.0pt'><td width=122 style='width:60.8pt;border:solid windowtext 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>Vin</p></td><td width=149 style='width:74.55pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>1.8V-5.5V</p></td><td width=140 style='width:70.0pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>1.8V-5V</p></td><td width=142 style='width:71.15pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>1.8V-5V</p></td><td width=137 style='width:68.6pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>1.8V-5V</p></td><td width=132 style='width:65.75pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>1.8V-5.5V</p></td><td width=128 style='width:63.8pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>2.7V-12V</p></td></tr><tr style='height:17.0pt'><td width=122 style='width:60.8pt;border:solid windowtext 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>Vout</p></td><td width=149 style='width:74.55pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>2.85V-4.4V</p></td><td width=140 style='width:70.0pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>2.85V-4.4V</p></td><td width=142 style='width:71.15pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>2.85V-4.4V</p></td><td width=137 style='width:68.6pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>1.8V-5.5V</p></td><td width=132 style='width:65.75pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>5V</p></td><td width=128 style='width:63.8pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>4.5V-12.6V</p></td></tr><tr style='height:17.0pt'><td width=122 style='width:60.8pt;border:solid windowtext 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>I/O</p></td><td width=149 style='width:74.55pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>1.8V</p></td><td width=140 style='width:70.0pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>1.8V</p></td><td width=142 style='width:71.15pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>1.2V</p></td><td width=137 style='width:68.6pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>1.8V</p></td><td width=132 style='width:65.75pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>1.8V</p></td><td width=128 style='width:63.8pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>1.2V</p></td></tr><tr style='height:17.0pt'><td width=122 style='width:60.8pt;border:solid windowtext 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>ISW</p></td><td width=149 style='width:74.55pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>5A</p></td><td width=140 style='width:70.0pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>4A</p></td><td width=142 style='width:71.15pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>4A</p></td><td width=137 style='width:68.6pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>4A</p></td><td width=132 style='width:65.75pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>2.15A</p></td><td width=128 style='width:63.8pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>10A</p></td></tr><tr style='height:17.0pt'><td width=122 style='width:60.8pt;border:solid windowtext 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>BYP_FET</p></td><td width=149 style='width:74.55pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>Y</p></td><td width=140 style='width:70.0pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>Y</p></td><td width=142 style='width:71.15pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>Y</p></td><td width=137 style='width:68.6pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>--</p></td><td width=132 style='width:65.75pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>--</p></td><td width=128 style='width:63.8pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>--</p></td></tr><tr style='height:17.0pt'><td width=122 style='width:60.8pt;border:solid windowtext 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>I²C</p></td><td width=149 style='width:74.55pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>Y</p></td><td width=140 style='width:70.0pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>Y</p></td><td width=142 style='width:71.15pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>Y</p></td><td width=137 style='width:68.6pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>--</p></td><td width=132 style='width:65.75pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>--</p></td><td width=128 style='width:63.8pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>--</p></td></tr><tr style='height:17.0pt'><td width=122 style='width:60.8pt;border:solid windowtext 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>Iq</p></td><td width=149 style='width:74.55pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>65μA</p></td><td width=140 style='width:70.0pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>55μA</p></td><td width=142 style='width:71.15pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>56μA</p></td><td width=137 style='width:68.6pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>90μA</p></td><td width=132 style='width:65.75pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>4μA</p></td><td width=128 style='width:63.8pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt'><p class=MsoNormal>30μA</p></td></tr><tr style='height:39.7pt'><td width=122 style='width:60.8pt;border:solid windowtext 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt'><p class=MsoNormal>Packages</p></td><td width=149 style='width:74.55pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt'><p class=MsoNormal>WL-CSP1.67x1.67-16(BSC)</p></td><td width=140 style='width:70.0pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt'><p class=MsoNormal>WL-CSP1.67x1.67-16(BSC)</p></td><td width=142 style='width:71.15pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt'><p class=MsoNormal>WL-CSP1.67x1.67-16(BSC)</p></td><td width=137 style='width:68.6pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt'><p class=MsoNormal>TSOT-23-8(FC)</p></td><td width=132 style='width:65.75pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt'><p class=MsoNormal>WL-CSP1.3x1.2-9(BSC)</p></td><td width=128 style='width:63.8pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt'><p class=MsoNormal>VQFN2x2.5-11</p></td></tr></table><br><br><h2 id=“__Bookmark__1”>2 不同類型升壓轉換器特性與應用範例</h2><h3>2.1 具有旁路開關架構的升壓轉換器：RT4803、RT4803A、RT4803B</h3><p class=bady>一般升壓轉換器在 Bypass Mode 運行時，輸入電流需經過電感與上橋 MOSFET (HS_FET) 後才傳輸至輸出端，導致較高的導通損耗。然而，RT4803 系列產品在 Bypass Mode 下，電流僅需通過內建的旁路開關 (BYP_FET) 即可直接輸出，避免電感直流電阻 (DCR) 所帶來的額外損耗，顯著降低導通損耗，能有效降低 Bypass Mode 下的整體電壓降，並能確保輸出電壓不低於目標值。此外，透過增加旁路開關，相較於傳統架構的 97% 至 98% 效率，可進一步提升至接近 100%，減少功耗與熱能產生，提升系統效能與可靠性。</p><p class=bady>此系列產品由於使用小型 CSP 封裝，其中 RT4803B 的 I/O 可低至 1.2V，適合用於具有高容量低操作電壓特性的矽負極電池 (Si-Anode battery) 在手機應用模組，例如：2G PA、Wi-Fi 模組、音源放大器等，或是其他行動或穿戴式裝置應用。</p><p class=bady><a class="fancybox" href="/content/dam/richtek-eds/resources/application-notes/an087/html-images-zh_tw/image001_zh-tw.png"><img border=0 width=401 height=159 src="/content/dam/richtek-eds/resources/application-notes/an087/html-images-zh_tw/image001_zh-tw.png" alt="Technical Document Image Preview"></a></p><p class=bady>圖 1. 行動裝置電源應用範例</p><br><h3>2.2 低靜態電流升壓轉換器：RT4823</h3><p class=bady>RT4823 也是一款採用 CSP 小型封裝的升壓轉換器，專為智慧型手機及小型穿戴式裝置應用而設計。以下範例展示其在手機 OTG (On-The-Go) 功能中的應用。當使用者將小型風扇、儲存裝置或手電筒等周邊設備連接至 USB 接口時，手機需提供 5V 電壓輸出。根據 Type-C 標準，此類應用通常要求約 5V/1.5A，即 7.5W 的輸出功率。RT4823 正可以滿足此需求，提供 OTG 應用上所需要的電壓，此外，僅有 4μA 的靜態電流，更適合長時間待機的應用場景。RT4823 還內建防逆灌 (Reverse Blocking) 保護機制，可有效防止外部電壓回灌至輸入端，提升系統穩定性與安全性。</p><p class=bady><a class="fancybox" href="/content/dam/richtek-eds/resources/application-notes/an087/html-images-zh_tw/image002_zh-tw.png"><img border=0 width=594 height=198 id="Picture 5" src="/content/dam/richtek-eds/resources/application-notes/an087/html-images-zh_tw/image002_zh-tw.png" alt="A screenshot of a computer&#10;&#10;Description automatically generated"></a></p><p class=bady>圖 2. 行動裝置 OTG 應用範例</p><br><h3>2.3 簡易設計升壓轉換器：RT4812</h3><p class=MsoNormal>RT4812 是一款採用 TSOT-23-8 封裝的高效能升壓轉換器，具備簡單易用的設計。透過 FB 引腳可靈活調整輸出電壓，並可直接透過引腳配置平均輸出電流限制閾值，以適應 1A 或 2.1A 兩種不同應用需求。TSOT-23-8 封裝設計具有成本優勢，無需透過 PCB 鑽孔 (Via) 佈線，使其特別適用於單/雙層板具有成本考量的應用，如行動電源、無線滑鼠等消費性電子產品。</p><p class=bady><a class="fancybox" href="/content/dam/richtek-eds/resources/application-notes/an087/html-images-zh_tw/image003_zh-tw.png"><img border=0 width=485 height=157 id="Picture 6" src="/content/dam/richtek-eds/resources/application-notes/an087/html-images-zh_tw/image003_zh-tw.png" alt="A screenshot of a computer&#10;&#10;Description automatically generated"></a></p><p class=bady>圖 3. 光學滑鼠應用</p><br><h3>2.4 高輸出電壓升壓轉換器：RT8581</h3><p class=MsoNormal>RT8581 是一款高輸出電壓的升壓轉換器，可為採用先進鋰離子電池的系統提供高效、緊湊的電源解決方案，提供高至 20W 的功率輸出。RT8581 可從單顆鋰離子電池提供穩定的輸出電壓，且內部開關元件具有低導通電阻，重載效率可高達 94.5% (Vin = 5V, Vout = 12V, Iout = 1.5A)。圖 4 顯示 RT8581 在 NAND Flash 供電中的應用，透過 RT8581 為 VPP 供電，可有效提升 NAND Flash 的寫入速度，優化存儲性能並提升系統整體效能。</p><p class=bady><a class="fancybox" href="/content/dam/richtek-eds/resources/application-notes/an087/html-images-zh_tw/image004_zh-tw.png"><img border=0 width=377 height=213 id="Picture 7" src="/content/dam/richtek-eds/resources/application-notes/an087/html-images-zh_tw/image004_zh-tw.png" alt="A screenshot of a computer&#10;&#10;Description automatically generated"></a></p><p class=MsoNormal><a name="_Ref193902965">圖</a>4. NAND Flash 供電應用</p><p class=MsoNormal>除此之外，RT8581 也可以用來對音頻放大器供電，如圖 5 所示。</p><p class=bady><a class="fancybox" href="/content/dam/richtek-eds/resources/application-notes/an087/html-images-zh_tw/image005_zh-tw.jpg"><img border=0 width=463 height=225 id="Picture 8" src="/content/dam/richtek-eds/resources/application-notes/an087/html-images-zh_tw/image005_zh-tw.jpg" alt="A screenshot of a computer&#10;&#10;Description automatically generated"></a></p><p class=MsoNormal><a name="_Ref193903408">圖</a>5. 音頻放大器應用</p><br><br><h2 id=“__Bookmark__2”>3 結論</h2><p class=MsoNormal>立錡提供多樣化的升壓轉換器產品，以滿足不同應用場景對於功率效率、靜態電流、封裝尺寸及控制介面的需求。本應用筆記提供各類升壓轉換器的特性與應用範例，幫助工程師快速選擇最合適的解決方案。透過 RT4803 系列的旁路開關架構，可有效降低導通損耗並提升效率；RT4823 以超低靜態電流特性，適用於 OTG 及長時間待機應用；RT4812 提供簡易設計方案，具有成本優勢；而 RT8581 則具備高電壓輸出能力，能夠為高功耗應用如 NAND Flash 及 9W 至 15W 音頻放大器提供穩定電源。工程師可在不同應用中實現最佳的電源管理方案，確保產品在高效能、低功耗之間達到最佳平衡。</p></div><br><br><br><Br><br><br>

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• RT4803
• RT4812
• RT4823
• RT8581

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