<!-- 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">Achieving High Power Density with RTQ5756 Four-Phase Synchronous Buck Converter Family</h1> <i class="far fa-calendar-alt date-i"></i> <span class="ml-2 date">JULY. 23, 2025 | Newsletter Issue 52</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"> <a href="https://www.youtube.com/watch?v=5rpDCLwzJ0g&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue52EN&sc_lang=en " target="_blank"> <img class="img-center" style="max-width:600px;" alt="RTQ5756 Four-Phase Synchronous Buck Converter Family" src="/content/dam/richtek-eds/resources/tech-insights/news/newsletter-issue-52/html-images/en_EDM_video.jpg"></a> </div> <div class="col-md-12 mb-40"> <p>As AI and high-performance computing continue to shape modern technology, systems are increasingly integrating DSPs or FPGAs to support real-time processing and data-intensive workloads. These applications require higher current and compact designs, making high power density a critical challenge in power system design.</p> <p>To address this, Richtek introduces its ACOT^® 4-phase synchronous Buck converter family RTQ5756, supporting 3V to 5.5V input and 0.4V to 2.05V output. Housed in a compact WL-CSP2.69x3.92-54(BSC) package, this family enables a complete solution within a 70 mm³ form factor, delivering high power density of 0.285W/mm³. Its multi-phase topology reduces output ripple and improves efficiency, ideal for powering DSP in optical modules for AI data centers or high-current, space-constrained systems.</p> </div> <div class="col-md-12 "> <div class="mb-2"> <div class="section-title font-weight-bold mb-30 pb-3">Flexible Phase Configurations & Multiple Output Selections</div> </div> </div> <div class="col-md-12 text-center"> <img class="img-center " style="max-width:900px;" alt="Flexible Phase Configurations & Multiple Output Selections" src="/content/dam/richtek-eds/resources/tech-insights/news/newsletter-issue-52/html-images/en_I52_02.jpg"> </div> <div class="col-md-12 mb-40"> <p>The RTQ5756 family supports 4 phase operation with various output configurations tailored to system requirements: 1+1+1+1 phase for four outputs, 2+1+1 or 3+1 phase for three outputs, 2+2 or 3+1 phase for dual outputs, and 4-phase single-output, supporting up to 20A output current. The I²C control enables configuration of power-on/off sequencing, watchdog timers, fault detection, dynamic voltage scaling, and slew rate settings, providing high flexibility in system design. </p> </div> <div class="col-md-12 "> <div class="mb-2"> <div class="section-title font-weight-bold mb-30 pb-3">Automatic Phase Adjustment for Optimized Efficiency</div> </div> </div> <div class="col-md-6 "> <img class="img-center " style="max-width:600px;" alt="Automatic Phase Adjustment for Optimized Efficiency" src="/content/dam/richtek-eds/resources/tech-insights/news/newsletter-issue-52/html-images/en_I52_03.jpg"> </div> <div class="col-md-6 d-flex align-items-center justify-content-center "> <p>In multi-phase output mode, the device intelligently adapts switching frequency and dynamically manages phase addition or reduction based on load conditions. This Auto Phase Adding/Shedding feature reduces power consumption under light load while ensuring sufficient current delivery under heavy load, maximizing overall efficiency.</p> </div> <div class="col-md-12 "> <div class="mb-2"> <div class="section-title font-weight-bold mb-30 pb-3">High Power Density </div> </div> </div> <div class="col-md-12 "> <p>The total solution requires only 7mm×10mm×1mm of board space and supports up to 20W output power, achieving 0.285W/mm³ high power density, ideal for core power rails in compact systems.</p> <div class="btn-block pb-4 pt-3"> <a href="https://www.youtube.com/watch?v=5rpDCLwzJ0g&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue52EN&sc_lang=en" target="_blank" class="btn-sm btn-primary py-2 px-3">More product introduction and start-up configuration <i class="fas fa-arrow-right pl-2"></i> </a>&nbsp;&nbsp;&nbsp; <a href="https://www.richtek.com/~/media/1E14017509CA4DC2A1B7B07E7C8DAFDF.ashx?&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue52EN&sc_lang=en" target="_blank" class="btn-sm btn-primary py-2 px-3">Download the design tool <i class="fas fa-arrow-right pl-2"></i> </a> </div> <p>Order the Wrenboard toolkit to start your RTQ5756 design.</p> <div class="btn-block pb-4 pt-3"> <a href="https://www.digikey.com/en/products/detail/richtek-usa-inc/RD0001-01/17728794" target="_blank" class="btn-sm btn-primary py-2 px-3">Order the Wrenboard toolkit <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> <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">Product Number</th> <th scope="col">Output Channel(s)</th> <th scope="col">Output Phase</th> <th scope="col">Output Current</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=RTQ5756&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue52EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;">RTQ5756A</a>&nbsp;&nbsp; <a href="https://www.richtek.com/SaveDownload.aspx?specid=RTQ5756&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue52EN&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-52/html-images/en_ic-download-2.png" width="30px;" height="30px"/></a> </th> <td>3</td> <td>2+1+1</td> <td>10A+5A+5A</td> <td><a href="https://www.digikey.com/en/products/detail/richtek-usa-inc/RTQ5756AWSC/25994236?s=N4IgTCBcDaIEoBUCKBWA7CgbCAugXyA" target="_blank"><img alt="Buy-on-Line" border="0" src="/content/dam/richtek-eds/resources/tech-insights/news/newsletter-issue-52/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=RTQ5756&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue52EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;">RTQ5756B</a>&nbsp;&nbsp; <a href="https://www.richtek.com/SaveDownload.aspx?specid=RTQ5756&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue52EN&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-52/html-images/en_ic-download-2.png" width="30px;" height="30px"/></a> </th> <td>4</td> <td>1+1+1+1</td> <td>5A+5A+5A+5A</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-52/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=RTQ5756&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue52EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;">RTQ5756C</a>&nbsp;&nbsp; <a href="https://www.richtek.com/SaveDownload.aspx?specid=RTQ5756&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue52EN&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-52/html-images/en_ic-download-2.png" width="30px;" height="30px"/></a> </th> <td>2</td> <td>3+1</td> <td>15A+5A</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-52/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=RTQ5756&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue52EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;">RTQ5756D</a>&nbsp;&nbsp; <a href="https://www.richtek.com/SaveDownload.aspx?specid=RTQ5756&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue52EN&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-52/html-images/en_ic-download-2.png" width="30px;" height="30px"/></a> </th> <td>1</td> <td>4</td> <td>20A</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-52/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=RTQ5756&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue52EN&sc_lang=en" target="_blank" style="text-decoration: none; color: #37a6d9;font-size: 1.1rem;">RTQ5756E</a>&nbsp;&nbsp; <a href="https://www.richtek.com/SaveDownload.aspx?specid=RTQ5756&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue52EN&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-52/html-images/en_ic-download-2.png" width="30px;" height="30px"/></a> </th> <td>2</td> <td>2+2</td> <td>10A+10A</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-52/html-images/en_ic-email.png" width="35px;" style="width: 35px;"></a></td> </tr> </tbody> </table> </div> </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=Issue52EN&sc_lang=en">Data Center</a> <a class="badge btn-tag" href="https://www.richtek.com/Parametric%20Search/Parametric%20Search?tree_id=17&blockId=%7b84097BD4-BDAA-4177-A183-F276C1C97451%7d&utm_source=Newsletter&utm_medium=RTWWW&utm_campaign=Issue52EN&sc_lang=en">Buck Converter</a> </div> </div> </div> </div> </div> </section>

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