工业用低噪声线性稳压器介绍

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<h1>工业用低噪声线性稳压器介绍</h1> Willie Wen, Sophia Tong | AN082 本篇应用文章探讨线性稳压器在工业领域中的应用场景以及系统需求。与切换式稳压器相比，线性稳压器具有低噪声、输出电压、小尺寸封装、低关机电流和高成本效益，可适用于不同的工业应用。本篇文章先探讨低噪声性能参数的重要性，并介绍立锜工业用低噪声线性稳压器的性能与优点。此外，也提供了相关产品列表，以帮助使用者针对系统需求，选择合适的产品。 <h2 id="__Bookmark__0">1 工业应用场景与系统需求</h2> 图1是一个工业系统的简单应用场景，输入电压通常为12V或是24V。对噪声敏感的系统，其特点是需要较低的输出电压，除了会被使用在无线基础设施中，如主动式天线单元 (AAU) 和多输入多输出 (MIMO) 系统，还会被应用于仪器和医疗设备的射频放大器或数位类比转换器中。为了从较高的输入电压源向对噪声敏感系统提供较低的输出电压，通常使用切换式稳压器作为第二电源级，这种方法提高了功率转换效率，并最小化内部被动元件中的功率损耗。然而，切换式稳压器可能会引入来自开关晶体管的内部噪声，和从输入电源经由电缆的外部噪声。因此，在切换式稳压器和对噪声敏感的系统之间放置一个具有降噪特性的线性稳压器是必要的。这个低噪声线性稳压器可在其输入端过滤掉噪声，并在输出端提供干净、线性的电力，最小化系统信号链中的电压量测不匹配。 <a class="fancybox" href="/content/dam/richtek-eds/resources/application-notes/an082/html-images-zh_cn/image001_zh-cn.png" ><img width=549 height=76 src="/content/dam/richtek-eds/resources/application-notes/an082/html-images-zh_cn/image001_zh-cn.png" alt="Technical Document Image Preview"></a> <a name="_Ref165297871">图</a>1. 简单工业系统应用方块图 <h2 id="__Bookmark__1">2 低噪声线性稳压器</h2> 低噪声线性稳压器，具有三个关键特性：电源纹波抑制比 (PSRR)、输出噪声，和噪声频谱密度。PSRR用于过滤来自外部电源和切换式稳压器输出的输入端噪声，可消除额外输入滤波元件的需求。如图2所示，低噪声线性稳压器的典型PSRR曲线，展示了PSRR如何反映由输入电压波动引起的输出纹波电压的变化。这种关系可以用下面的对数形式方程式来表示： <a class="fancybox" href="/content/dam/richtek-eds/resources/application-notes/an082/html-images-zh_cn/image002_zh-cn.png" ><img width=227 height=51 src="/content/dam/richtek-eds/resources/application-notes/an082/html-images-zh_cn/image002_zh-cn.png" alt="一張含有字型, 文字, 白色, 印刷術的圖片

自動產生的描述"></a> 其中DVIN代表输入电压涟波，而DVOUT代表输出电压涟波，两个参数都是在同一个频率点下量测的结果。 此外，由于线性稳压器的输出阻抗和内部补偿的关系，输出电流也会影响PSRR的结果。因此，建议选择具有高PSRR的线性稳压器来消除反映在输出端的输入噪声。 <a class="fancybox" href="/content/dam/richtek-eds/resources/application-notes/an082/html-images-zh_cn/image003_zh-cn.jpg" ><img width=302 height=257 src="/content/dam/richtek-eds/resources/application-notes/an082/html-images-zh_cn/image003_zh-cn.jpg" alt="一張含有文字, 行, 繪圖, 圖表的圖片

自動產生的描述"></a> <a name="_Ref165298014">图</a>2. 典型的电源纹波抑制比曲线 低噪声线性稳压器的另一个重要特性是输出噪声频谱密度曲线与频率的关系，这是一个以微伏每赫兹平方根 (µV/√Hz)为振幅的频谱图，如图3所示。这个图帮助使用者评估低噪声线性稳压器的输出噪声频率响应，以确保其满足系统要求。此外，在从图3获得量测数据后，可以使用下面的方程式中显示的黎曼积分中点法则，估算出在工业标准带宽（通常从10Hz到100kHz）内的输出电压噪声振幅大小： <a class="fancybox" href="/content/dam/richtek-eds/resources/application-notes/an082/html-images-zh_cn/image004_zh-cn.png" ><img width=377 height=63 id="圖片 1" src="/content/dam/richtek-eds/resources/application-notes/an082/html-images-zh_cn/image004_zh-cn.png" alt="一張含有文字, 字型, 行, 筆跡的圖片

自動產生的描述"></a> 其中 NoiseN 是噪声频谱密度中第N个频率点的振幅大小，而 fN 与 fN+1则是第 N 与 N+1 个频率点。 <a class="fancybox" href="/content/dam/richtek-eds/resources/application-notes/an082/html-images-zh_cn/image005_zh-cn.jpg" ><img width=331 height=261 id="圖片 2" src="/content/dam/richtek-eds/resources/application-notes/an082/html-images-zh_cn/image005_zh-cn.jpg" alt="一張含有文字, 螢幕擷取畫面, 行, 繪圖的圖片

自動產生的描述"></a> <a name="_Ref165298226">图</a>3. 输出噪声性能曲线 利用上述提供的噪声方程式，图3中描绘的噪声水平在0.8V、1.5V、3.3V和5V的输出电压下，可以分别被计算为7.67、8.75、11.25和15.92微伏特均方根 (µVRMS)，并且是在10Hz到100kHz的频率范围内。 下面的设计范例展示了用于射频放大器驱动 (RF Biasing)、锁相控制回路 (PLL)、压控振荡器 (VCO)、类比数位转换器 (ADC) 与数位类比转换器 (DAC)、串列数据传输 (SerDes)、现场可编程逻辑闸阵列 (FPGA) 和数字信号处理器 (DSP) 应用的低噪声线性稳压器。我们最新的低噪声线性稳压器系列，RTQ2538/RTQ2539/RTQ2540，特别为对噪声敏感的应用而设计。这个系列具有高PSRR，在大约500kHz时高达40dB，以及优异的噪声免疫性能，达到6.8µVRMS。此外，通过在NR/SS引脚添加外部旁路电容，可以增强输出抗噪性。它还包括一个启用输入 (Enable) 和一个电源良好指示器 (PGOOD)，可更容易地达成系统时序控制。 <div class="tb-system"> <table class=MsoTableGrid border=0 cellspacing=0 cellpadding=0 style='border-style: none; border-color: inherit; border-width: medium; width:22.2cm; border-collapse:collapse;'> <tr style='height:121.15pt'> <td style='width:278pt; padding:0cm 1.4pt 0cm 1.4pt;height:121.15pt'> <a class="fancybox" href="/content/dam/richtek-eds/resources/application-notes/an082/html-images-zh_cn/image006_zh-cn.png" ><img width=259 height=124 src="/content/dam/richtek-eds/resources/application-notes/an082/html-images-zh_cn/image006_zh-cn.png" alt="Technical Document Image Preview"></a> </td> <td style='width:255pt; padding:0cm 1.4pt 0cm 1.4pt;height:121.15pt'> <a class="fancybox" href="/content/dam/richtek-eds/resources/application-notes/an082/html-images-zh_cn/image007_zh-cn.png" ><img width=251 height=156 src="/content/dam/richtek-eds/resources/application-notes/an082/html-images-zh_cn/image007_zh-cn.png" alt="Technical Document Image Preview"></a> </td> </tr> <tr style='height:17.6pt'> <td style='width:278pt; padding:0cm 1.4pt 0cm 1.4pt;height:17.6pt'> 图4(a). 可编程逻辑闸阵列的设计参考范例 </td> <td style='width:255pt; padding:0cm 1.4pt 0cm 1.4pt;height:17.6pt'> 图4(b). 数位类比与类比数位转换器的设计参考范例 </td> </tr> </table> </div> <h2 id="__Bookmark__2">3 可简单设定输出电压的低噪声线性稳压器</h2> 在其他工业领域中，I/O扩充装置是另一种常用的应用，它通过串列通讯汇流排 (I2C) 或电源管理总线 (PMBUS) 的介面为CPU提供通用目的I/O (GPIO) 引脚。 GPIO的数量通常从2到48引脚不等，可以通过最小化系统印刷电路版面积和简化软体开发时程来降低产品的元件数量与总成本。因此，我们有简单设定输出电压的系列，RTQ2532/RTQ2533/RTQ2537，消除了外部电阻分压器的需求，如下面的设计范例5(a)和5(b)所示。输出电压可以通过将IC引脚接到高电位与低电压的方式，进而实现动态输出电压控制的系统应用。 这个系列具有高PSRR，在大约500kHz时高达40dB，以及优异的噪声免疫性能，达到6.8µVRMS。通过在NR/SS引脚添加外部旁路电容可以增强输出抗噪性。它还包括一个启用输入 (Enable) 和一个电源良好指示器 (PGOOD)，可更容易地达成系统时序控制。 <div class="tb-system"> <table class=MsoTableGrid border=0 cellspacing=0 cellpadding=0 width=756 style='width:20.0cm;border-collapse:collapse;border:none'> <tr style='height:121.15pt'> <td width=340 style='width:254.85pt;padding:0cm 1.4pt 0cm 1.4pt;height:121.15pt'> <a class="fancybox" href="/content/dam/richtek-eds/resources/application-notes/an082/html-images-zh_cn/image008_zh-cn.png" ><img width=296 height=151 src="/content/dam/richtek-eds/resources/application-notes/an082/html-images-zh_cn/image008_zh-cn.png" alt="Technical Document Image Preview"></a> </td> <td width=340 style='width:254.85pt;padding:0cm 1.4pt 0cm 1.4pt;height:121.15pt'> <a class="fancybox" href="/content/dam/richtek-eds/resources/application-notes/an082/html-images-zh_cn/image009_zh-cn.png" ><img width=268 height=151 src="/content/dam/richtek-eds/resources/application-notes/an082/html-images-zh_cn/image009_zh-cn.png" alt="Technical Document Image Preview"></a> </td> </tr> <tr style='height:17.6pt'> <td width=340 style='width:254.85pt;padding:0cm 1.4pt 0cm 1.4pt;height:17.6pt'> 图5(a). 简易设定输出电压的参考线路图 </td> <td width=340 style='width:254.85pt;padding:0cm 1.4pt 0cm 1.4pt;height:17.6pt'> 图5(b). I/O扩充装置的参考范例 </td> </tr> </table> </div> <h2 id="__Bookmark__3">4 低噪声线性稳压器概述</h2> 立锜提供多种低噪声线性稳压器，以满足对噪声敏感的应用需求，具有以下特点： (1) 低至6.8µVRMS卓越的低噪声。 (2) 单一输入电压可支援低至1.1V：单一供电输入，不需额外电源，可简化印刷电路版布局，便于系统设计。此外，在需要较低输出电压、较大输出电流条件的应用上，我们的低噪声线性稳压器系列都可支援低至1.1V的输入供电电压。 (3) 输出电压可支援低至0.5V，精准度1%，适用于低功耗的高性能工业系统应用。 (4) 支援极低的压降电压，工业系统通常需要大工作电流，输出电压必须尽可能接近输入电压以降低功率损耗。例如，RTQ2540H在最高4A的输出电流下，其最大压降电压仅为145mV。 (5) 小尺寸晶片，仅2.2x2.5毫米，可满足印刷电路版布局空间的限制。 <h3>4.1 低噪声线性稳压器系列</h3> 表1. 小尺寸、极低压降电压系列 <table class=MsoNormalTable border=1 cellspacing=0 cellpadding=0 width=800 style='border-collapse:collapse;border:none'> <tr> <td width=66 style='width:49.65pt;border:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:40pt'> Part Number </td> <td width=38 style='border-right: 1.0pt solid windowtext; border-top: 1.0pt solid windowtext; border-bottom: 1.0pt solid windowtext; width:1.0cm; padding:.6pt .6pt 0cm .6pt;height:40pt; border-left-style: none; border-left-color: inherit; border-left-width: medium;'> IOUT (A) </td> <td width=49 style='border-right: 1.0pt solid windowtext; border-top: 1.0pt solid windowtext; border-bottom: 1.0pt solid windowtext; width:36.55pt; padding:.6pt .6pt 0cm .6pt;height:40pt; border-left-style: none; border-left-color: inherit; border-left-width: medium;'> VIN Range (V) </td> <td width=49 style='border-right: 1.0pt solid windowtext; border-top: 1.0pt solid windowtext; border-bottom: 1.0pt solid windowtext; width:37.1pt; padding:.6pt .6pt 0cm .6pt;height:40pt; border-left-style: none; border-left-color: inherit; border-left-width: medium;'> VOUT Range (V) </td> <td width=57 style='border-right: 1.0pt solid windowtext; border-top: 1.0pt solid windowtext; border-bottom: 1.0pt solid windowtext; width:42.7pt; padding:.6pt .6pt 0cm .6pt;height:40pt; border-left-style: none; border-left-color: inherit; border-left-width: medium;'> Accuracy (%) </td> <td width=46 style='border-right: 1.0pt solid windowtext; border-top: 1.0pt solid windowtext; border-bottom: 1.0pt solid windowtext; width:34.3pt; padding:.6pt .6pt 0cm .6pt;height:40pt; border-left-style: none; border-left-color: inherit; border-left-width: medium;'> RMS Noise (µVRMS) </td> <td width=56 style='border-right: 1.0pt solid windowtext; border-top: 1.0pt solid windowtext; border-bottom: 1.0pt solid windowtext; width:42.0pt; padding:.6pt .6pt 0cm .6pt;height:40pt; border-left-style: none; border-left-color: inherit; border-left-width: medium;'> Typ. PSRR @ 500kHz (dB) </td> <td width=59 style='border-right: 1.0pt solid windowtext; border-top: 1.0pt solid windowtext; border-bottom: 1.0pt solid windowtext; width:44.05pt; padding:.6pt .6pt 0cm .6pt;height:40pt; border-left-style: none; border-left-color: inherit; border-left-width: medium;'> Dropout @ Full Load (mV) </td> <td width=58 style='border-right: 1.0pt solid windowtext; border-top: 1.0pt solid windowtext; border-bottom: 1.0pt solid windowtext; width:43.4pt; padding:.6pt .6pt 0cm .6pt;height:40pt; border-left-style: none; border-left-color: inherit; border-left-width: medium;'> Quiescent Current (mA) </td> <td width=102 style='border-right: 1.0pt solid windowtext; border-top: 1.0pt solid windowtext; border-bottom: 1.0pt solid windowtext; width:76.3pt; padding:.6pt .6pt 0cm .6pt;height:40pt; border-left-style: none; border-left-color: inherit; border-left-width: medium;'> Package(s) </td> <td width=100 style='border-right: 1.0pt solid windowtext; border-top: 1.0pt solid windowtext; border-bottom: 1.0pt solid windowtext; width:74.9pt; padding:.6pt .6pt 0cm .6pt;height:40pt; border-left-style: none; border-left-color: inherit; border-left-width: medium;'> Features </td> </tr> <tr style='height:17.0pt'> <td width=66 style='width:49.65pt;border:solid windowtext 1.0pt;border-top: none;padding:.6pt .6pt 0cm .6pt;height:17.0pt'> RTQ2552A </td> <td width=38 style='width:1.0cm;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> 2 </td> <td width=49 style='width:36.55pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:17.0pt'> 1.1 ~ 6.5 </td> <td width=49 style='width:37.1pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> 0.8 ~ 5.2 </td> <td width=57 style='width:42.7pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> ±1% </td> <td width=46 style='width:34.3pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> 6.8 </td> <td width=56 style='width:42.0pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> 40 </td> <td width=59 style='width:44.05pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:17.0pt'> 90 </td> <td width=58 style='width:43.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> 3.7 </td> <td width=102 style='width:76.3pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:17.0pt'> WDFN-10L-2.5x2.5 </td> <td width=100 style='width:74.9pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:17.0pt'> EN, SS, PG </td> </tr> <tr style='height:17.0pt'> <td width=66 style='width:49.65pt;border:solid windowtext 1.0pt;border-top: none;padding:.6pt .6pt 0cm .6pt;height:17.0pt'> RTQ2538H </td> <td width=38 style='width:1.0cm;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> 2 </td> <td width=49 style='width:36.55pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:17.0pt'> 1.1 ~ 6.5 </td> <td width=49 style='width:37.1pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> 0.8 ~ 5.5 </td> <td width=57 style='width:42.7pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> ±1% </td> <td width=46 style='width:34.3pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> 6.8 </td> <td width=56 style='width:42.0pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> 40 </td> <td width=59 style='width:44.05pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:17.0pt'> 90 </td> <td width=58 style='width:43.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> 3.7 </td> <td width=102 style='width:76.3pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:17.0pt'> WQFN-12L-2.2x2.5 </td> <td width=100 style='width:74.9pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:17.0pt'> EN, SS, PG </td> </tr> <tr style='height:17.0pt'> <td width=66 style='width:49.65pt;border:solid windowtext 1.0pt;border-top: none;padding:.6pt .6pt 0cm .6pt;height:17.0pt'> RTQ2539A </td> <td width=38 style='width:1.0cm;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> 3 </td> <td width=49 style='width:36.55pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:17.0pt'> 1.1 ~ 6.5 </td> <td width=49 style='width:37.1pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> 0.8 ~ 5.5 </td> <td width=57 style='width:42.7pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> ±1% </td> <td width=46 style='width:34.3pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> 6.8 </td> <td width=56 style='width:42.0pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> 40 </td> <td width=59 style='width:44.05pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:17.0pt'> 130 </td> <td width=58 style='width:43.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> 4.3 </td> <td width=102 style='width:76.3pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:17.0pt'> WQFN-12L-2.2x2.5 </td> <td width=100 style='width:74.9pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:17.0pt'> EN, SS, PG </td> </tr> <tr style='height:17.0pt'> <td width=66 style='width:49.65pt;border:solid windowtext 1.0pt;border-top: none;padding:.6pt .6pt 0cm .6pt;height:17.0pt'> RTQ2539C </td> <td width=38 style='width:1.0cm;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> 3 </td> <td width=49 style='width:36.55pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:17.0pt'> 1.1 ~ 6.5 </td> <td width=49 style='width:37.1pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> 0.5 ~ 5.5 </td> <td width=57 style='width:42.7pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> ±1% </td> <td width=46 style='width:34.3pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> 8.7 </td> <td width=56 style='width:42.0pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> 40 </td> <td width=59 style='width:44.05pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:17.0pt'> 130 </td> <td width=58 style='width:43.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17.0pt'> 4.3 </td> <td width=102 style='width:76.3pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:17.0pt'> WDFN-12L-2.2x2.5 </td> <td width=100 style='width:74.9pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:17.0pt'> EN, SS, PG </td> </tr> <tr> <td width=66 style='border-left: 1.0pt solid windowtext; border-right: 1.0pt solid windowtext; border-bottom: 1.0pt solid windowtext; width:49.65pt; padding:.6pt .6pt 0cm .6pt;height:17pt; border-top-style: none; border-top-color: inherit; border-top-width: medium;'> RTQ2540H </td> <td width=38 style='width:1.0cm;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17pt; border-left-style: none; border-left-color: inherit; border-left-width: medium; border-top-style: none; border-top-color: inherit; border-top-width: medium;'> 4 </td> <td width=49 style='width:36.55pt;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:17pt; border-left-style: none; border-left-color: inherit; border-left-width: medium; border-top-style: none; border-top-color: inherit; border-top-width: medium;'> 1.1 ~ 6.5 </td> <td width=49 style='width:37.1pt;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17pt; border-left-style: none; border-left-color: inherit; border-left-width: medium; border-top-style: none; border-top-color: inherit; border-top-width: medium;'> 0.8 ~ 5.5 </td> <td width=57 style='width:42.7pt;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17pt; border-left-style: none; border-left-color: inherit; border-left-width: medium; border-top-style: none; border-top-color: inherit; border-top-width: medium;'> ±1% </td> <td width=46 style='width:34.3pt;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17pt; border-left-style: none; border-left-color: inherit; border-left-width: medium; border-top-style: none; border-top-color: inherit; border-top-width: medium;'> 6.8 </td> <td width=56 style='width:42.0pt;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17pt; border-left-style: none; border-left-color: inherit; border-left-width: medium; border-top-style: none; border-top-color: inherit; border-top-width: medium;'> 40 </td> <td width=59 style='width:44.05pt;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:17pt; border-left-style: none; border-left-color: inherit; border-left-width: medium; border-top-style: none; border-top-color: inherit; border-top-width: medium;'> 145 </td> <td width=58 style='width:43.4pt;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:17pt; border-left-style: none; border-left-color: inherit; border-left-width: medium; border-top-style: none; border-top-color: inherit; border-top-width: medium;'> 4.3 </td> <td width=102 style='width:76.3pt;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:17pt; border-left-style: none; border-left-color: inherit; border-left-width: medium; border-top-style: none; border-top-color: inherit; border-top-width: medium;'> WQFN-12L-2.2x2.5 </td> <td width=100 style='width:74.9pt;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:17pt; border-left-style: none; border-left-color: inherit; border-left-width: medium; border-top-style: none; border-top-color: inherit; border-top-width: medium;'> EN, SS, PG </td> </tr> </table> 表2. 简易输出电压设定系列 <table class=MsoNormalTable border=1 cellspacing=0 cellpadding=0 width=800 style='border-collapse:collapse;border:none'> <thead> <tr style='height:51.0pt'> <td width=66 style='width:49.65pt;border:solid windowtext 1.0pt;padding: .6pt .6pt 0cm .6pt;height:51.0pt'> Part Number </td> <td width=38 style='width:1.0cm;border:solid windowtext 1.0pt;border-left: none;padding:.6pt .6pt 0cm .6pt;height:51.0pt'> IOUT (A) </td> <td width=49 style='width:36.55pt;border:solid windowtext 1.0pt;border-left: none;padding:.6pt .6pt 0cm .6pt;height:51.0pt'> VIN Range (V) </td> <td width=49 style='width:36.4pt;border:solid windowtext 1.0pt;border-left: none;padding:.6pt .6pt 0cm .6pt;height:51.0pt'> VOUT Range ADJ. (V) </td> <td width=56 style='width:42.0pt;border:solid windowtext 1.0pt;border-left: none;padding:.6pt .6pt 0cm .6pt;height:51.0pt'> VOUT Range Easy-Out (V) </td> <td width=55 style='width:41.3pt;border:solid windowtext 1.0pt;border-left: none;padding:.6pt .6pt 0cm .6pt;height:51.0pt'> Accuracy (%) </td> <td width=49 style='width:36.4pt;border:solid windowtext 1.0pt;border-left: none;padding:.6pt .6pt 0cm .6pt;height:51.0pt'> RMS Noise (µVRMS) </td> <td width=59 style='width:44.05pt;border:solid windowtext 1.0pt;border-left: none;padding:.6pt .6pt 0cm .6pt;height:51.0pt'> Typ. PSRR @ 500kHz (dB) </td> <td width=58 style='width:43.4pt;border:solid windowtext 1.0pt;border-left: none;padding:.6pt .6pt 0cm .6pt;height:51.0pt'> Dropout @ Full Load (mV) </td> <td width=102 style='width:76.3pt;border:solid windowtext 1.0pt;border-left: none;padding:.6pt .6pt 0cm .6pt;height:51.0pt'> Package(s) </td> <td width=100 style='width:74.9pt;border:solid windowtext 1.0pt;border-left: none;padding:.6pt .6pt 0cm .6pt;height:51.0pt'> Features </td> </tr> </thead> <tr style='height:1.0cm'> <td width=66 style='width:49.65pt;border:solid windowtext 1.0pt;border-top: none;padding:.6pt .6pt 0cm .6pt;height:1.0cm'> RTQ2532N </td> <td width=38 style='width:1.0cm;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 2 </td> <td width=49 style='width:36.55pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> 1.1 ~ 6.5 </td> <td width=49 style='width:36.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 0.8 ~ 5.5 </td> <td width=56 style='width:42.0pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 0.8 ~ 3.95 </td> <td width=55 style='width:41.3pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> ±1% </td> <td width=49 style='width:36.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 6.8 </td> <td width=59 style='width:44.05pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> 40 </td> <td width=58 style='width:43.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 125 </td> <td width=102 style='width:76.3pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> VQFN-20L-3.5x3.5 </td> <td width=100 style='width:74.9pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> EN, SS, PG, 50mV Pin-Strapped </td> </tr> <tr style='height:1.0cm'> <td width=66 style='width:49.65pt;border:solid windowtext 1.0pt;border-top: none;padding:.6pt .6pt 0cm .6pt;height:1.0cm'> RTQ2532W </td> <td width=38 style='width:1.0cm;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 2 </td> <td width=49 style='width:36.55pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> 1.1 ~ 6.5 </td> <td width=49 style='width:36.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 0.8 ~ 5.5 </td> <td width=56 style='width:42.0pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 0.8 ~ 3.95 </td> <td width=55 style='width:41.3pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> ±1% </td> <td width=49 style='width:36.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 6.8 </td> <td width=59 style='width:44.05pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> 40 </td> <td width=58 style='width:43.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 125 </td> <td width=102 style='width:76.3pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> VQFN-20L-5x5 </td> <td width=100 style='width:74.9pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> EN, SS, PG, 50mV Pin-Strapped </td> </tr> <tr style='height:1.0cm'> <td width=66 style='width:49.65pt;border:solid windowtext 1.0pt;border-top: none;padding:.6pt .6pt 0cm .6pt;height:1.0cm'> RTQ2532E </td> <td width=38 style='width:1.0cm;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 2 </td> <td width=49 style='width:36.55pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> 1.1 ~ 6.5 </td> <td width=49 style='width:36.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 0.5 ~ 5.5 </td> <td width=56 style='width:42.0pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 0.5 ~ 2.075 </td> <td width=55 style='width:41.3pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> ±1% </td> <td width=49 style='width:36.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 6.8 </td> <td width=59 style='width:44.05pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> 40 </td> <td width=58 style='width:43.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 125 </td> <td width=102 style='width:76.3pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> VQFN-20L-3.5x3.5 </td> <td width=100 style='width:74.9pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> EN, SS, PG, 25mV Pin-Strapped </td> </tr> <tr style='height:1.0cm'> <td width=66 style='width:49.65pt;border:solid windowtext 1.0pt;border-top: none;padding:.6pt .6pt 0cm .6pt;height:1.0cm'> RTQ2532E1 </td> <td width=38 style='width:1.0cm;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 2 </td> <td width=49 style='width:36.55pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> 1.1 ~ 6.5 </td> <td width=49 style='width:36.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 0.5 ~ 5.5 </td> <td width=56 style='width:42.0pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 0.5 ~ 2.075 </td> <td width=55 style='width:41.3pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> ±1% </td> <td width=49 style='width:36.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 6.8 </td> <td width=59 style='width:44.05pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> 40 </td> <td width=58 style='width:43.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 125 </td> <td width=102 style='width:76.3pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> VQFN-20L-5x5 </td> <td width=100 style='width:74.9pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> EN, SS, PG, 25mV Pin-Strapped </td> </tr> <tr style='height:1.0cm'> <td width=66 style='width:49.65pt;border:solid windowtext 1.0pt;border-top: none;padding:.6pt .6pt 0cm .6pt;height:1.0cm'> RTQ2533W </td> <td width=38 style='width:1.0cm;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 3 </td> <td width=49 style='width:36.55pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> 1.1 ~ 6.5 </td> <td width=49 style='width:36.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 0.8 ~ 5.5 </td> <td width=56 style='width:42.0pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 0.8 ~ 3.95 </td> <td width=55 style='width:41.3pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> ±1% </td> <td width=49 style='width:36.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 6.8 </td> <td width=59 style='width:44.05pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> 40 </td> <td width=58 style='width:43.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 180 </td> <td width=102 style='width:76.3pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> VQFN-20L-3.5x3.5 </td> <td width=100 style='width:74.9pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> EN, SS, PG, 50mV Pin-Strapped </td> </tr> <tr style='height:1.0cm'> <td width=66 style='width:49.65pt;border:solid windowtext 1.0pt;border-top: none;padding:.6pt .6pt 0cm .6pt;height:1.0cm'> RTQ2533E </td> <td width=38 style='width:1.0cm;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 3 </td> <td width=49 style='width:36.55pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> 1.1 ~ 6.5 </td> <td width=49 style='width:36.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 0.5 ~ 5.5 </td> <td width=56 style='width:42.0pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 0.5 ~ 2.075 </td> <td width=55 style='width:41.3pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> ±1% </td> <td width=49 style='width:36.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 6.8 </td> <td width=59 style='width:44.05pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> 40 </td> <td width=58 style='width:43.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 180 </td> <td width=102 style='width:76.3pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> VQFN-20L-3.5x3.5 </td> <td width=100 style='width:74.9pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> EN, SS, PG, 25mV Pin-Strapped </td> </tr> <tr style='height:1.0cm'> <td width=66 style='width:49.65pt;border:solid windowtext 1.0pt;border-top: none;padding:.6pt .6pt 0cm .6pt;height:1.0cm'> RTQ2537 </td> <td width=38 style='width:1.0cm;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 4 </td> <td width=49 style='width:36.55pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> 1.1 ~ 6.5 </td> <td width=49 style='width:36.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 0.8 ~ 5.5 </td> <td width=56 style='width:42.0pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 0.8 ~ 3.95 </td> <td width=55 style='width:41.3pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> ±1% </td> <td width=49 style='width:36.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 6.8 </td> <td width=59 style='width:44.05pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> 40 </td> <td width=58 style='width:43.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 240 </td> <td width=102 style='width:76.3pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> VQFN-20L-3.5x3.5 </td> <td width=100 style='width:74.9pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> EN, SS, PG, 50mV Pin-Strapped </td> </tr> <tr style='height:1.0cm'> <td width=66 style='width:49.65pt;border:solid windowtext 1.0pt;border-top: none;padding:.6pt .6pt 0cm .6pt;height:1.0cm'> RTQ2537E </td> <td width=38 style='width:1.0cm;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 4 </td> <td width=49 style='width:36.55pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> 1.1 ~ 6.5 </td> <td width=49 style='width:36.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 0.5 ~ 5.5 </td> <td width=56 style='width:42.0pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 0.5 ~ 2.075 </td> <td width=55 style='width:41.3pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> ±1% </td> <td width=49 style='width:36.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 6.8 </td> <td width=59 style='width:44.05pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> 40 </td> <td width=58 style='width:43.4pt;border-top:none;border-left:none;border-bottom: solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:.6pt .6pt 0cm .6pt; height:1.0cm'> 240 </td> <td width=102 style='width:76.3pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> VQFN-20L-3.5x3.5 </td> <td width=100 style='width:74.9pt;border-top:none;border-left:none; border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt; padding:.6pt .6pt 0cm .6pt;height:1.0cm'> EN, SS, PG, 25mV Pin-Strapped </td> </tr> </table> <h2 id="__Bookmark__4">5 总结</h2> 立锜的低噪声线性稳压器系列具有高PSRR、低噪声和简易设计的特点，使用者可轻松地依照不同的工业应用需求做选择。 <table border="1" cellspacing="0" cellpadding="0" style="width: 637.5pt; border-collapse: collapse; border: medium none;" class="3-51"> <tbody> <tr style="height: 17pt;"> <td style="border-width: 1pt 1px 1px 1pt; border-style: solid; border-color: #009eb8; background-color: #009eb8; background-image: url(e); background-repeat: repeat; background-attachment: scroll; background-clip: border-box; background-origin: padding-box; background-size: auto; padding-right: 5pt; padding-left: 5pt; height: 17pt;" colspan="2"> 相关资源 </td> </tr> <tr> <td style="border-width: 1pt 1px 1px 1pt; border-style: solid; border-color: #009eb8; background-color: #ffffff; background-image: url(e); background-repeat: repeat; background-attachment: scroll; background-clip: border-box; background-origin: padding-box; background-size: auto; padding-right: 5pt; padding-left: 5pt; height: 17pt;"> 立锜科技电子报 </td> <td style="border-width: 1pt 1px 1px 1pt; border-style: solid; border-color: #009eb8; background-color: #ffffff; background-image: url(e); background-repeat: repeat; background-attachment: scroll; background-clip: border-box; background-origin: padding-box; background-size: auto; padding-right: 5pt; padding-left: 5pt; height: 17pt;"> <a class="link" href="http://www.richtek.com/My%20Richtek/Newsletters" target="_blank">订阅立锜科技电子报</a> </td> </tr> <tr> <td style="border-width: 1pt 1px 1px 1pt; border-style: solid; border-color: #009eb8; background-color: #ffffff; background-image: url(e); background-repeat: repeat; background-attachment: scroll; background-clip: border-box; background-origin: padding-box; background-size: auto; padding-right: 5pt; padding-left: 5pt; height: 17pt;"> 档案下载 </td> <td style="border-width: 1pt 1px 1px 1pt; border-style: solid; border-color: #009eb8; background-color: #ffffff; background-image: url(e); background-repeat: repeat; background-attachment: scroll; background-clip: border-box; background-origin: padding-box; background-size: auto; padding-right: 5pt; padding-left: 5pt; height: 17pt;"> <a class="link" href="~/media/B7BD206DC2B14C6E85282830BD8CD70D.ashx">PDF 下载</a> </td> </tr> </tbody> </table>

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