<!-- Bootstrap core CSS --> <link href="/css/www-style.css" rel="stylesheet"> <link href="/css/bootstrap.css" rel="stylesheet"> <link href="/css/newsletter.css" rel="stylesheet"> <link href="/css/alfontawesome-all.css" rel="stylesheet"> <!-- Custom fonts for this template --> <section> <div class="key-container"> <div class="cus-content-subscribe"> <div class="row no-gutters"> <div class=" col-md-12"> <div class="page-header"> <a class="cus-btn btn-sm" href="https://www.richtek.com/My Richtek/Newsletters.aspx"><i class="fas fa-envelope"></i>&nbsp;&nbsp;Subscribe to Richtek Newsletter</a> </div> </div> </div> </div> </div> <div class="key-container pb-5"> <!-- Title start --> <div class="cus-content"> <div class="row no-gutters "> <div class="col-md-12 "> <div class="page-header"> <h1 class="font-weight-bold">Current Sense Amplifier Design Considerations and Examples：PoE, USB PD, Desktop and Server Applications</h1> <i class="far fa-calendar-alt date-i"></i> <span class="ml-2 date">JAN. 06, 2026 | Newsletter Issue 55</span> </div> </div> </div> </div> <!-- Content End --> <div class="cus-content"> <div class="row no-gutters "> <div class="col-md-12 mb-20 text-center"> <img class="img-center " style="max-width:600px;" alt="Current Sense Amplifier Design Considerations and Examples" src="/content/dam/richtek-eds/resources/tech-insights/news/newsletter-issue-55/html-images/en_image001_EN.jpg"> </div> <div class="col-md-12 mb-40"> <p>In modern electronics, precision current monitoring is more than protection as it defines system efficiency and reliability. By selecting the right current sense amplifier, system designers can achieve real-time visibility of power behaviour, allowing effective circuit protection, efficiency optimisation and intelligent remote control across complex systems. Current sense amplifiers are divided into two types:</p> <ul style="line-height:2;"> <li><b>Digital Type</b> – providing complete voltage, current and power data and supporting I²C and SMBus interfaces, ideal for standby management and data analysis applications. </li> <li><b> Analog Type</b> – offering fast response and simple circuitry, well-suited for real-time feedback and protection functions. </li> </ul> </div> <div class="col-md-12 "> <p>To meet diverse design requirements, Richtek offers a comprehensive range of high-precision current sense amplifiers, including digital types RTQ6132 / RTQ6134 / RTQ6136、<a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6059&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;"> RTQ6059 </a>、<a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6053/RTQ6053B&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;"> RTQ6053 </a> / <a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6056&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;"> RTQ6056 </a>, and Analog types <a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6060&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;"> RTQ6060A/RTQ6060B </a>、<a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6050/RTQ6052&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;"> RTQ6050/RTQ6052 </a>. These devices cover a wide input voltage range and various accuracy levels, helping system designers quickly implement the most suitable power monitoring solutions.</p> </div> <div class="col-md-12 mb-40 text-center"> <p><b>Application Examples</b></p> </div> <div class="col-md-12"> <div class=" row justify-content-center"> <table class="table " style="width: 800px;"> <thead class="thead-light"> <tr> <th scope="col" style="padding: 5px 5px;">Application</th> <th scope="col">Description</th> </tr> </thead> <tbody> <tr> <th scope="row">Servers</th> <td>In data centers, current sense amplifiers play a crucial role in power monitoring, energy optimisation and remote diagnostics. The RTQ6136, designed for 48 V systems, supports up to 75V AMR common-mode voltage, fulfilling high-reliability monitoring requirements.</td> </tr> <tr> <th scope="row">USB Power Delivery (USB PD)</th> <td>Accurate current monitoring ensures charging safety and optimised power efficiency.The <a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6059&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;"> RTQ6059 </a> offers two address-select pins supporting up to 16 address options, ideal for multi-port PD systems managed by a single embedded controller.</td> </tr> <tr> <th scope="row">PoE (Power over Ethernet)</th> <td>Current sensing enables identification of PD type and power demand, allowing dynamic power allocation and preventing overload in multi-PD systems. The <a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6056&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;"> RTQ6056 </a>, featuring a low-voltage detection function, is placed on the low-side to monitor PoE input and assist system control.</td> </tr> <tr> <th scope="row">Desktop Computers</th> <td>Real-time current monitoring enhances performance and reliability while reducing design risk. The<a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6060&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;"> RTQ6060 </a>serves as the main power monitoring component, providing rapid current feedback to the embedded controller for instant system adjustment.</td> </tr> </tbody> </table> </div> </div> <div class="col-md-12 mb-40"> <p>Current sense amplifiers have become an integral part of power management and system design. Richtek provides a complete portfolio of current sense amplifiers for more efficient and reliable systems.</p> <div class="btn-block pb-4 pt-3"> <a href="https://www.richtek.com/Design%20Support/Technical%20Document/AN091?&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" class="btn-sm btn-primary py-2 px-3">See Application Note <i class="fas fa-arrow-right pl-2"></i> </a> </div> </div> </div> </div> <div class="cus-content"> <div class="row no-gutters"> <div class="col-md-12 pt-3"> <div class="new-product"> <h3 class="font-weight-bold">FEATURED PRODUCTS</h3> <p>Check out the products that meet your area of interest for more information</p> </div> </div> </div> <!-- Product start --> <div class="col-md-12"> <p><b>Digital CSA</b></p> </div> <div class="row no-gutters"> <div class="col-md-12 text-center"> <table class="table table-hover table-bordered table-sm"> <thead class="thead-dark"> <tr> <th scope="col" style="min-width: 150px">Product Number</th> <th scope="col">Common Mode Voltage Range</th> <th scope="col">Maximum Offset</th> <th scope="col">Maximum Gain Error</th> <th scope="col">Input Sense Range</th> <th scope="col">Package(s)</th> <th scope="col" style="max-width:80px;">Buy Online</th> </tr> </thead> <tbody> <tr> <th scope="row" style="padding-top:8px;">RTQ6136 </th> <td>0V to 60V</td> <td>4µV</td> <td>0.1%</td> <td>Programmable</td> <td>TWCSP-8P, TSOT-28</td> <td><a href="https://forms.office.com/Pages/ResponsePage.aspx?id=6GOM0O6GNE6h5UQzg3P0seMVen-xb9hAr_ZA0LheCTNUOUJXOTZSRVZNSFlGU0xIMTZJMzRXSk9IRC4u" target="_blank"><img alt="Buy-on-Line" border="0" src="/content/dam/richtek-eds/resources/tech-insights/news/newsletter-issue-55/html-images/en_ic-email.png" width="35px;" style="width: 35px;"></a></td> </tr> <tr> <th scope="row" style="padding-top:8px;">RTQ6134 </th> <td>0V to 60V</td> <td>80µV</td> <td>0.5%</td> <td>Programmable</td> <td>TWCSP-8P</td> <td><a href="https://forms.office.com/Pages/ResponsePage.aspx?id=6GOM0O6GNE6h5UQzg3P0seMVen-xb9hAr_ZA0LheCTNUOUJXOTZSRVZNSFlGU0xIMTZJMzRXSk9IRC4u" target="_blank"><img alt="Buy-on-Line" border="0" src="/content/dam/richtek-eds/resources/tech-insights/news/newsletter-issue-55/html-images/en_ic-email.png" width="35px;" style="width: 35px;"></a></td> </tr> <tr> <th scope="row" style="padding-top:8px;">RTQ6132 </th> <td>0V to 60V</td> <td>40µV</td> <td>0.3%</td> <td>Programmable</td> <td>TSOT-28</td> <td><a href="https://forms.office.com/Pages/ResponsePage.aspx?id=6GOM0O6GNE6h5UQzg3P0seMVen-xb9hAr_ZA0LheCTNUOUJXOTZSRVZNSFlGU0xIMTZJMzRXSk9IRC4u" target="_blank"><img alt="Buy-on-Line" border="0" src="/content/dam/richtek-eds/resources/tech-insights/news/newsletter-issue-55/html-images/en_ic-email.png" width="35px;" style="width: 35px;"></a></td> </tr> <tr> <th scope="row" style="padding-top:8px;"><a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6059&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;">RTQ6059</a> <a href="https://www.richtek.com/SaveDownload.aspx?specid=RTQ6059&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="padding:0px;text-decoration:none;display:inline-block"><img align="middle" style="padding-bottom: 3px;" alt="download datasheet" border="0" src="/content/dam/richtek-eds/resources/tech-insights/news/newsletter-issue-55/html-images/en_ic-download-2.png" width="30px;" height="30px"/></a> </th> <td>0V to 32V</td> <td>50µV</td> <td>0.3%</td> <td>Programmable</td> <td>TSOT-23-8, MSOP-10</td> <td><a href="https://www.digikey.com/en/products/result?s=N4IgTCBcDaIEoBUCKA2ADAVgJwgLoF8g" target="_blank"><img alt="Buy-on-Line" border="0" src="/content/dam/richtek-eds/resources/tech-insights/news/newsletter-issue-55/html-images/en_ic-cart.png" width="35px;" style="width: 35px;"></a></td> </tr> <tr> <th scope="row" style="padding-top:8px;"><a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6056&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;">RTQ6056</a> <a href="https://www.richtek.com/SaveDownload.aspx?specid=RTQ6056&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="padding:0px;text-decoration:none;display:inline-block"><img align="middle" style="padding-bottom: 3px;" alt="download datasheet" border="0" src="/content/dam/richtek-eds/resources/tech-insights/news/newsletter-issue-55/html-images/en_ic-download-2.png" width="30px;" height="30px"/></a> </th> <td>0V to 36V</td> <td>10µV</td> <td>0.12%</td> <td>Fixed</td> <td>MSOP-10</td> <td><a href="https://www.digikey.com/en/products/result?s=N4IgTCBcDaIEoBUCKA2ADAVhSAugXyA" target="_blank"><img alt="Buy-on-Line" border="0" src="/content/dam/richtek-eds/resources/tech-insights/news/newsletter-issue-55/html-images/en_ic-cart.png" width="35px;" style="width: 35px;"></a></td> </tr> <tr> <th scope="row" style="padding-top:8px;"><a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6053/RTQ6053B&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;">RTQ6053</a> <a href="https://www.richtek.com/SaveDownload.aspx?specid=RTQ6053/RTQ6053B&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="padding:0px;text-decoration:none;display:inline-block"><img align="middle" style="padding-bottom: 3px;" alt="download datasheet" border="0" src="/content/dam/richtek-eds/resources/tech-insights/news/newsletter-issue-55/html-images/en_ic-download-2.png" width="30px;" height="30px"/></a> </th> <td>0V to 36V</td> <td>25µV</td> <td>0.3%</td> <td>Fixed</td> <td>VQFN-16L</td> <td><a href="https://www.digikey.com/en/products/result?s=N4IgTCBcDaIEoBUCKA2ADAVgMwgLoF8g" target="_blank"><img alt="Buy-on-Line" border="0" src="/content/dam/richtek-eds/resources/tech-insights/news/newsletter-issue-55/html-images/en_ic-cart.png" width="35px;" style="width: 35px;"></a></td> </tr> </tbody> </table> </div> </div> <!-- Digital CSA 0V to 32V start --> <div class="col-md-12 mb-40"> <p><b>Analog CSA</b></p> </div> <div class="row no-gutters"> <div class="col-md-12 text-center"> <table class="table table-hover table-bordered table-sm"> <thead class="thead-dark"> <tr> <th scope="col" style="min-width: 155px">Product Number</th> <th scope="col">Common Mode Voltage Range</th> <th scope="col">Maximum Offset</th> <th scope="col">Maximum Gain Error</th> <th scope="col">Available Gain</th> <th scope="col">Package(s)</th> <th scope="col" style="max-width:80px;">Buy Online</th> </tr> </thead> <tbody> <tr> <th scope="row" style="padding-top:8px;"><a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6060&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;">RTQ6060A</a> <a href="https://www.richtek.com/SaveDownload.aspx?specid=RTQ6060&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="padding:0px;text-decoration:none;display:inline-block"><img align="middle" style="padding-bottom: 3px;" alt="download datasheet" border="0" src="/content/dam/richtek-eds/resources/tech-insights/news/newsletter-issue-55/html-images/en_ic-download-2.png" width="30px;" height="30px"/></a> </th> <td>0V to 36V</td> <td>±35µV~±100µV</td> <td>±0.4%</td> <td>50V/V、75V/V、100V/V、200V/V、500V/V、1000V/V</td> <td>SC-70-6</td> <td><a href="https://forms.office.com/Pages/ResponsePage.aspx?id=6GOM0O6GNE6h5UQzg3P0seMVen-xb9hAr_ZA0LheCTNUOUJXOTZSRVZNSFlGU0xIMTZJMzRXSk9IRC4u" target="_blank"><img alt="Buy-on-Line" border="0" src="/content/dam/richtek-eds/resources/tech-insights/news/newsletter-issue-55/html-images/en_ic-email.png" width="35px;" style="width: 35px;"></a></td> </tr> <tr> <th scope="row" style="padding-top:8px;"><a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6060&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;">RTQ6060B</a> <a href="https://www.richtek.com/SaveDownload.aspx?specid=RTQ6060&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="padding:0px;text-decoration:none;display:inline-block"><img align="middle" style="padding-bottom: 3px;" alt="download datasheet" border="0" src="/content/dam/richtek-eds/resources/tech-insights/news/newsletter-issue-55/html-images/en_ic-download-2.png" width="30px;" height="30px"/></a> </th> <td>0V to 36V</td> <td>±150µV</td> <td>±0.8%</td> <td>50V/V、75V/V、100V/V、200V/V、500V/V、1000V/V</td> <td>SC-70-6</td> <td><a href="https://forms.office.com/Pages/ResponsePage.aspx?id=6GOM0O6GNE6h5UQzg3P0seMVen-xb9hAr_ZA0LheCTNUOUJXOTZSRVZNSFlGU0xIMTZJMzRXSk9IRC4u" target="_blank"><img alt="Buy-on-Line" border="0" src="/content/dam/richtek-eds/resources/tech-insights/news/newsletter-issue-55/html-images/en_ic-email.png" width="35px;" style="width: 35px;"></a></td> </tr> <tr> <th scope="row" style="padding-top:8px;"><a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6050/RTQ6052&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;">RTQ6052</a> <a href="https://www.richtek.com/SaveDownload.aspx?specid=RTQ6050/RTQ6052&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="padding:0px;text-decoration:none;display:inline-block"><img align="middle" style="padding-bottom: 3px;" alt="download datasheet" border="0" src="/content/dam/richtek-eds/resources/tech-insights/news/newsletter-issue-55/html-images/en_ic-download-2.png" width="30px;" height="30px"/></a> </th> <td>2V to 80V</td> <td>±2.5mV</td> <td>±2%</td> <td>100V/V</td> <td>MSOP-8, SOP-8</td> <td><a href="https://www.digikey.com/en/products/result?s=N4IgTCBcDaIEoBUCKA2ADAVggXQL5A" target="_blank"><img alt="Buy-on-Line" border="0" src="/content/dam/richtek-eds/resources/tech-insights/news/newsletter-issue-55/html-images/en_ic-cart.png" width="35px;" style="width: 35px;"></a></td> </tr> <tr> <th scope="row" style="padding-top:8px;"><a href="https://www.richtek.com/RedirectToProduct?specid=RTQ6050/RTQ6052&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;">RTQ6050</a> <a href="https://www.richtek.com/SaveDownload.aspx?specid=RTQ6050/RTQ6052&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="padding:0px;text-decoration:none;display:inline-block"><img align="middle" style="padding-bottom: 3px;" alt="download datasheet" border="0" src="/content/dam/richtek-eds/resources/tech-insights/news/newsletter-issue-55/html-images/en_ic-download-2.png" width="30px;" height="30px"/></a> </th> <td>2V to 80V</td> <td>±2.5mV</td> <td>±2%</td> <td>20V/V</td> <td>MSOP-8, SOP-8</td> <td><a href="https://www.digikey.com/en/products/result?s=N4IgTCBcDaIEoBUCKA2ADAVjSAugXyA" target="_blank"><img alt="Buy-on-Line" border="0" src="/content/dam/richtek-eds/resources/tech-insights/news/newsletter-issue-55/html-images/en_ic-cart.png" width="35px;" style="width: 35px;"></a></td> </tr> </tbody> </table> </div> </div> <div class="col-md-12 "> <p>For consumer applications, we also offer the<a href="https://www.richtek.com/RedirectToProduct?specid=RT6050/RT6052&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;"> RT6050 </a>、<a href="https://www.richtek.com/RedirectToProduct?specid=RT6050/RT6052&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;"> RT6052 </a>、<a href="https://www.richtek.com/RedirectToProduct?specid=RT6053&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;"> RT6053 </a>and<a href="https://www.richtek.com/RedirectToProduct?specid=RT6056&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;"> RT6056 </a>.</p> </div> <!-- Content End --> <!-- Keywords start --> <div class="tag-content"> <div class="row no-gutters"> <div class="col-md-12 mb-40"> <div class="new-product"> <p>Want to keep up to date with all our latest news and information? <a class="link" href="https://www.richtek.com/My Richtek/Newsletters.aspx" target="_blank">Subscribe here!</a></p> </div> </div> </div> <div class="row no-gutters align-items-start"> <div class="col-12"> <a class="badge btn-tag" href="https://www.richtek.com/applications/communication-enterprise/data-center?&ActiveTab=Data Center&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en">Data Center</a> <a class="badge btn-tag" href="https://www.richtek.com/applications/automotive?&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en">Automotive & e-Mobility</a> <a class="badge btn-tag" href="https://www.richtek.com/Products/Operational%20Amplifier?&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue55EN&sc_lang=en">Amplifiers</a> </div> </div> </div> </div> </div> </section>

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