overview

1. Purpose

<p class="MsoNormal">The RT7238B/C/D is an advance integrative chip, which includes a LDO regulator and a synchronous Buck converter. This document explains the function and use of the RT7238 evaluation board (EVB) and provides information to enable operation and modification of the evaluation board and circuit to suit individual requirements. </p>

2. Introduction

<h3>General Product Description</h3> <p class="bady">The RT7238B/C/D is an advanced constant on-time (ACOT™) mode synchronous step-down converter. The main control loop of RT7238B/C/D using an advanced constant on-time (ACOT™) mode control which provides a very fast transient response. The RT7238B/C/D operates from 8V to 23V input voltage. For the RT7238D, the output voltage can be adjusted between 0.6V to 5V. The RT7238B/C/D is available in the UQFN-10L 3x3 (FC) package.</p>

3. Product Features

<ul> <li> Advanced Constant On-Time (ACOT) Control </li> <li> 8V to 23V (RT7238B/C/D) Input Voltage Range @ 8A Output Current </li> <li> ACOT™ Mode Performs Fast Transient Response </li> <li> ACOT™ Architecture to Enable all MLCC Output Capacitor Usage </li> <li> Fixed 500kHz Switching Frequency </li> <li> High Efficient Internal Power MOSFET Switch</li> ► 27mΩ (High-Side) and 10mΩ (Low-Side)<br /> <li> Adjustable Output Voltage from 0.9V to 5V (RT7238D) </li> <li> Fixed 3.3V (RT7238B/D) or 5V (RT7238C) LDO Output Supplies 70mA </li> <li> Pre-biased Soft-Start Cycle-by-Cycle Over-Current Protection </li> <li> Input Under-Voltage Lockout </li> <li> Thermal Shutdown </li> <li> Output Over/Under-Voltage Protection </li> </ul>

4. Application

<ul> <li> Industrial and Commercial Low Power Systems </li> <li> Computer Peripherals </li> <li> LCD Monitors and TVs </li> <li> Green Electronics/Appliances </li> <li> Point of Load Regulation for High-Performance DSPs, FPGAs, and ASICs </li> </ul>

5. Key Performance Summary Table

<table width="680" class="MsoTableLightListAccent2" style="border: currentColor; width: 510.2pt; border-collapse: collapse;" border="1" cellspacing="0" cellpadding="0"> <tbody> <tr style="height: 17pt;"> <td style="background: #009eb8; padding: 0cm 5.4pt; border: 1pt solid #009eb8; width: 35.78%; height: 17pt;"> <p class="ListParagraph1CxSpFirst">Key Features</p> </td> <td style="background: #009eb8; border-width: 1pt 1pt 1pt medium; border-style: solid solid solid none; border-color: #009eb8 #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 64.22%; height: 17pt;"> <p class="ListParagraph1CxSpLast">Evaluation Board Number : PCB029_V1</p> </td> </tr> <tr style="height: 17pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 35.78%; height: 17pt;"> <p class="ListParagraph1CxSpFirst">Default Input Voltage</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 64.22%; height: 17pt;"> <p class="ListParagraph1CxSpLast">8V to 23V</p> </td> </tr> <tr style="height: 17pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 35.78%; height: 17pt;"> <p class="ListParagraph1CxSpFirst">Max Output Current</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 64.22%; height: 17pt;"> <p class="ListParagraph1CxSpLast">8A</p> </td> </tr> <tr style="height: 39.7pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 35.78%; height: 39.7pt;"> <p class="ListParagraph1">Default Output Voltage</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 64.22%; height: 39.7pt;"> <p class="MsoNormal">3.3V (RT7238B) </p> <p class="MsoNormal">5.1V (RT7238C)</p> <p class="MsoNormal">1.05V (RT7238D)</p> </td> </tr> <tr style="height: 17pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 35.78%; height: 17pt;"> <p class="ListParagraph1CxSpFirst">Default Marking & Package Type</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 64.22%; height: 17pt;"> <p class="ListParagraph1CxSpLast">RT7238B/C/D, UQFN-10L 3x3 (FC)</p> </td> </tr> <tr style="height: 17pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 35.78%; height: 17pt;"> <p class="ListParagraph1CxSpFirst">Operation Frequency</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 64.22%; height: 17pt;"> <p class="ListParagraph1CxSpLast">500kHz</p> </td> </tr> </tbody> </table>

6. Evaluation Board

<div class="tb-system"> <table class="MsoTableGrid" style="border: currentColor; border-collapse: collapse;" border="0" cellspacing="0" cellpadding="0"> <tbody> <tr> <td valign="top" style="padding: 0cm 5.4pt; width: 260.5pt;"> <p class="2"><a href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7238cgquf/html-images/image001_en.jpg" class="fancybox"><img width="302" height="219" width="302" height="219" id="圖片 4" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7238cgquf/html-images/image001_en.jpg" /></a></p> </td> <td valign="top" style="padding: 0cm 5.4pt; width: 260.5pt;"> <p class="2"><a href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7238cgquf/html-images/image002_en.png" class="fancybox"><img width="302" height="219" width="302" height="219" id="圖片 6" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7238cgquf/html-images/image002_en.png" /></a></p> </td> </tr> <tr> <td valign="top" style="padding: 0cm 5.4pt; width: 260.5pt;"> <p class="2" style="text-align: center;">RT7238C Top View</p> </td> <td valign="top" style="padding: 0cm 5.4pt; width: 260.5pt;"> <p class="2" style="text-align: center;">RT7238C Bottom View</p> </td> </tr> </tbody> </table> </div> <p class="2">Please carefully inspect the EVB IC and external components, comparing them to the following Bill of Materials, to ensure that all components are installed and undamaged. If any components are missing or damaged during transportation, please contact the distributor or send e-mail to <a href="mailto:evb_service@richtek.com" class="link">evb_service@richtek.com</a></p> <p class="MsoNormal"> </p>

7. Test Points, Jumpers and Switches

<p class="MsoNormal">The EVB is provided with the test points, jumpers, switches and individual names listed in the table below.</p> <div> <table width="680" class="MsoTableLightListAccent2" style="border: currentColor; width: 510.2pt; border-collapse: collapse;" border="1" cellspacing="0" cellpadding="0"> <tbody> <tr style="height: 17pt;"> <td style="background: #009eb8; padding: 0cm 5.4pt; border: 1pt solid #009eb8; width: 19.2%; height: 17pt;"> <p class="10CxSpFirst">Test point/ name</p> </td> <td style="background: #009eb8; border-width: 1pt 1pt 1pt medium; border-style: solid solid solid none; border-color: #009eb8 #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 22.44%; height: 17pt;"> <p class="10CxSpMiddle">Signal</p> </td> <td style="background: #009eb8; border-width: 1pt 1pt 1pt medium; border-style: solid solid solid none; border-color: #009eb8 #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 58.36%; height: 17pt;"> <p class="10CxSpLast">Description (expected waveforms or voltage levels on test points)</p> </td> </tr> <tr style="height: 1cm;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 19.2%; height: 1cm;"> <p class="ListParagraph1CxSpFirst">VIN</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 22.44%; height: 1cm;"> <p class="ListParagraph1CxSpMiddle">Input voltage</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 58.36%; height: 1cm;"> <p class="ListParagraph1CxSpMiddle">Input voltage range</p> <p class="ListParagraph1CxSpLast">8V to 23V</p> </td> </tr> <tr style="height: 1cm;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 19.2%; height: 1cm;"> <p class="ListParagraph1CxSpFirst">VOUT</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 22.44%; height: 1cm;"> <p class="ListParagraph1CxSpMiddle">Output voltage </p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 58.36%; height: 1cm;"> <p class="ListParagraph1CxSpMiddle">Output voltage</p> <p class="ListParagraph1CxSpLast">3.35V(RT7238B), 5.1V(RT7238C), adjustable(RT7238D)</p> </td> </tr> <tr style="height: 17pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 19.2%; height: 17pt;"> <p class="ListParagraph1CxSpFirst">LX</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 22.44%; height: 17pt;"> <p class="ListParagraph1CxSpMiddle">LX voltage</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 58.36%; height: 17pt;"> <p class="ListParagraph1CxSpLast">Switch Node </p> </td> </tr> <tr style="height: 17pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 19.2%; height: 17pt;"> <p class="ListParagraph1CxSpFirst">BS</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 22.44%; height: 17pt;"> <p class="ListParagraph1CxSpMiddle">BOOT voltage</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 58.36%; height: 17pt;"> <p class="ListParagraph1CxSpLast">Bootstrap supply for high-side gate driver.</p> </td> </tr> <tr style="height: 39.7pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 19.2%; height: 39.7pt;"> <p class="ListParagraph1CxSpFirst">EN2/LDO/BYP</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 22.44%; height: 39.7pt;"> <p class="ListParagraph1CxSpMiddle">EN2/LDO/BYP voltage</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 58.36%; height: 39.7pt;"> <p class="ListParagraph1CxSpMiddle">Enable Control Input of the IC and Internal LDO for RT7238B</p> <p class="ListParagraph1CxSpMiddle">Internal 5V LDO Output for RT7238C</p> <p class="ListParagraph1CxSpLast">Bypass Input for the Internal LDO for RT7238D</p> </td> </tr> <tr style="height: 1cm;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 19.2%; height: 1cm;"> <p class="ListParagraph1CxSpFirst">LDO/VCC/LDO</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 22.44%; height: 1cm;"> <p class="ListParagraph1CxSpMiddle">LDO/VCC/LDO voltage</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 58.36%; height: 1cm;"> <p class="ListParagraph1CxSpMiddle">Internal 3.3V LDO Output for RT7238B/D</p> <p class="ListParagraph1CxSpLast">No Internal Connection for RT7238C</p> </td> </tr> <tr style="height: 1cm;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 19.2%; height: 1cm;"> <p class="ListParagraph1CxSpFirst">FB/FB/ILMIT</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 22.44%; height: 1cm;"> <p class="ListParagraph1CxSpMiddle">LDO/VCC/LDO voltage</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 58.36%; height: 1cm;"> <p class="ListParagraph1CxSpMiddle">Current Limit Setting for RT7238D</p> <p class="ListParagraph1CxSpLast">No Internal Connection for RT7238B/C</p> </td> </tr> <tr style="height: 1cm;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 19.2%; height: 1cm;"> <p class="ListParagraph1CxSpFirst">PG</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 22.44%; height: 1cm;"> <p class="ListParagraph1CxSpMiddle">PG voltage </p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 58.36%; height: 1cm;"> <p class="ListParagraph1CxSpLast">Power Good Indicator.This pin connect to LDO output through R3.</p> </td> </tr> <tr style="height: 17pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 19.2%; height: 17pt;"> <p class="ListParagraph1CxSpFirst">EN1/EN/EN</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 22.44%; height: 17pt;"> <p class="ListParagraph1CxSpMiddle">EN1/EN/EN voltage</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 58.36%; height: 17pt;"> <p class="ListParagraph1CxSpLast">Enable Control Input of the DC/DC Regulator.</p> </td> </tr> <tr style="height: 17pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 19.2%; height: 17pt;"> <p class="ListParagraph1CxSpFirst">GND</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 22.44%; height: 17pt;"> <p class="ListParagraph1CxSpMiddle">Ground</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 58.36%; height: 17pt;"> <p class="ListParagraph1CxSpLast">Ground</p> </td> </tr> </tbody> </table> </div> <div> <table width="680" class="MsoTableLightListAccent2" style="border: currentColor; width: 510.2pt; border-collapse: collapse;" border="1" cellspacing="0" cellpadding="0"> <tbody> <tr style="height: 17pt;"> <td style="background: #009eb8; padding: 0cm 5.4pt; border: 1pt solid #009eb8; width: 19.2%; height: 17pt;"> <p class="ListParagraph1CxSpFirst">Jumpers/ name</p> </td> <td style="background: #009eb8; border-width: 1pt 1pt 1pt medium; border-style: solid solid solid none; border-color: #009eb8 #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 22.44%; height: 17pt;"> <p class="ListParagraph1CxSpMiddle">Signal</p> </td> <td style="background: #009eb8; border-width: 1pt 1pt 1pt medium; border-style: solid solid solid none; border-color: #009eb8 #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 58.36%; height: 17pt;"> <p class="ListParagraph1CxSpLast">Description (expected waveforms or voltage levels on test points)</p> </td> </tr> <tr style="height: 1cm;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 19.2%; height: 1cm;"> <p class="ListParagraph1CxSpFirst">JP1</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 22.44%; height: 1cm;"> <p class="ListParagraph1CxSpMiddle">Output voltage</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 58.36%; height: 1cm;"> <p class="ListParagraph1CxSpMiddle">Output voltage</p> <p class="ListParagraph1CxSpLast">3.35V(RT7238B), 5.1V(RT7238C), adjustable(RT7238D)</p> </td> </tr> <tr style="height: 39.7pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 19.2%; height: 39.7pt;"> <p class="ListParagraph1CxSpFirst">JP2</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 22.44%; height: 39.7pt;"> <p class="ListParagraph1CxSpMiddle">Current Limit Setting voltage</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 58.36%; height: 39.7pt;"> <p class="ListParagraph1CxSpLast">This jumper only provides current limit setting function for RT7238D Please remove R16, short R10 R14 C18 and short this jumper when setting the current limit.</p> </td> </tr> <tr style="height: 67.6pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 19.2%; height: 67.6pt;"> <p class="ListParagraph1CxSpFirst">JP3</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 22.44%; height: 67.6pt;"> <p class="ListParagraph1CxSpMiddle">VOUT/BYP/EN2 voltage</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 58.36%; height: 67.6pt;"> <p class="ListParagraph1CxSpMiddle">This jumper provides different setteings for RT7238B/D.</p> <p class="ListParagraph1CxSpLast">When this EVB applis for RT7238D, this jumper can provide BYP pin bypass to buck output voltage function as BYP shorting to VOUT.When this EVB applis for RT7238B, please short the BYP to EN2.</p> </td> </tr> </tbody> </table> </div> <div> <table width="680" class="MsoTableLightListAccent2" style="border: currentColor; width: 510.2pt; border-collapse: collapse;" border="1" cellspacing="0" cellpadding="0"> <tbody> <tr style="height: 17pt;"> <td style="background: #009eb8; padding: 0cm 5.4pt; border: 1pt solid #009eb8; width: 19.2%; height: 17pt;"> <p class="ListParagraph1CxSpFirst">Switches/ name</p> </td> <td style="background: #009eb8; border-width: 1pt 1pt 1pt medium; border-style: solid solid solid none; border-color: #009eb8 #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 22.44%; height: 17pt;"> <p class="ListParagraph1CxSpMiddle">Signal</p> </td> <td style="background: #009eb8; border-width: 1pt 1pt 1pt medium; border-style: solid solid solid none; border-color: #009eb8 #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 58.36%; height: 17pt;"> <p class="ListParagraph1CxSpLast">Description (expected waveforms or voltage levels on test points)</p> </td> </tr> <tr style="height: 117pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 19.2%; height: 117pt;"> <p class="ListParagraph1CxSpFirst">SW1</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 22.44%; height: 117pt;"> <p class="ListParagraph1CxSpMiddle">EN1 voltage</p> <p class="ListParagraph1CxSpMiddle">EN2 voltage</p> <p class="ListParagraph1CxSpMiddle">ILMT_L voltage</p> <p class="ListParagraph1CxSpMiddle">ILMT_H voltage</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 58.36%; height: 117pt;"> <p class="ListParagraph1CxSpMiddle">This switch provide EN1, EN2, and current limit setting functions.</p> <p class="ListParagraph1CxSpMiddle">When this EVB applis for RT7238C/D/E, the EN1 switch is used to enable EN.</p> <p class="ListParagraph1CxSpMiddle">When this EVB applis for RT7238D, it can set ILMIT pin to “floating” by turn off ILMT_L and ILMT_H, “0” by turn on ILMT_L and turn off ILMT_H and “1” by turn off ILMT_L and turn on ILMT_H. </p> <p class="ListParagraph1CxSpLast">In order to avoid function fail. Please don’t turn on ILMT_L and ILMT_H simultaneiously. </p> </td> </tr> </tbody> </table> </div>

8. Power-up & Operating Guideline

<p class="MsoListParagraph">1. RT7238B starts work by providing VIN voltage then turn on EN1 and EN2 switches. In the RT7238B application, the BYP and VOUT of jumper JP3 must always short together and resistor R4 must always be shorted.</p> <p class="MsoListParagraph">2. RT7238C starts work by providing VIN voltage then turn on EN1 switches. In the RT7238C application, the resistor R4 must always be shorted.</p> <p class="MsoListParagraph">3. RT7238D starts work by providing VIN voltage then turn on EN1 switches. In the RT7238D application, the output voltage can be setted by individual resistor R4 and R5. Moreover, the current limt threshold can be chosen through ILMIT_L and ILMIT_H switches after the jumper J2 , resistor R14, R10 and capacitor C18 are shorted.</p>

9. Schematic

<p class="a5"><a href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7238cgquf/html-images/image003_en.jpg" class="fancybox"><img width="644" height="410" width="644" height="410" id="圖片 1" style="border-width: 0px; border-style: solid;" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7238cgquf/html-images/image003_en.jpg" /></a></p>

10. Bill of Materials

<div> <table width="680" class="MsoTableLightListAccent2" style="border: currentColor; border-collapse: collapse;" border="1" cellspacing="0" cellpadding="0"> <tbody> <tr style="height: 17pt;"> <td style="background: #009eb8; padding: 0cm 5.4pt; border: 1pt solid #009eb8; width: 92.15pt; height: 17pt; white-space: nowrap;"> <p class="TableTitleDS">Reference</p> </td> <td style="background: #009eb8; border-width: 1pt 1pt 1pt medium; border-style: solid solid solid none; border-color: #009eb8 #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 1cm; height: 17pt;"> <p class="TableTitleDS">Q'ty</p> </td> <td style="background: #009eb8; border-width: 1pt 1pt 1pt medium; border-style: solid solid solid none; border-color: #009eb8 #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 127.6pt; height: 17pt;"> <p class="TableTitleDS">Part Number</p> </td> <td style="background: #009eb8; border-width: 1pt 1pt 1pt medium; border-style: solid solid solid none; border-color: #009eb8 #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 120.45pt; height: 17pt; white-space: nowrap;"> <p class="TableTitleDS">Description</p> </td> <td style="background: #009eb8; border-width: 1pt 1pt 1pt medium; border-style: solid solid solid none; border-color: #009eb8 #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.9pt; height: 17pt;"> <p class="TableTitleDS">Package</p> </td> <td style="background: #009eb8; border-width: 1pt 1pt 1pt medium; border-style: solid solid solid none; border-color: #009eb8 #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.75pt; height: 17pt; white-space: nowrap;"> <p class="TableTitleDS">Manufacture</p> </td> </tr> <tr style="height: 17pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 92.15pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">C3, C4</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 1cm; height: 17pt;"> <p class="MsoNormal">2</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 127.6pt; height: 17pt;"> <p class="MsoNormal">C1608X5R0J475KT000N</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 120.45pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">4.7µF/6.3V/0603/X5R</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.9pt; height: 17pt;"> <p class="Tablebadyright">0603</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.75pt; height: 17pt; white-space: nowrap;"> <p class="Tablebadyright">TDK</p> </td> </tr> <tr style="height: 1cm;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 92.15pt; height: 1cm; white-space: nowrap;"> <p class="MsoNormal">L1</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 1cm; height: 1cm;"> <p class="MsoNormal">1</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 127.6pt; height: 1cm;"> <p class="MsoNormal">7443340100</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 120.45pt; height: 1cm; white-space: nowrap;"> <p class="MsoNormal">1µH for RT7238D</p> <p class="MsoNormal">2.2µH for RT7238B/C</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.9pt; height: 1cm;"> <p class="Tablebadyright">8 x 8 x 7.5 mm</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.75pt; height: 1cm; white-space: nowrap;"> <p class="Tablebadyright">GOTREND</p> </td> </tr> <tr style="height: 17pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 92.15pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">C6, C9</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 1cm; height: 17pt;"> <p class="MsoNormal">2</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 127.6pt; height: 17pt;"> <p class="MsoNormal">C1608X7R1H104KT000N</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 120.45pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">0.1µF/50V/0603/X5R</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.9pt; height: 17pt;"> <p class="Tablebadyright">0603</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.75pt; height: 17pt; white-space: nowrap;"> <p class="Tablebadyright">TDK</p> </td> </tr> <tr style="height: 17pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 92.15pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">C8, C10</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 1cm; height: 17pt;"> <p class="MsoNormal">2</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 127.6pt; height: 17pt;"> <p class="MsoNormal">GRM31CR61A226KE19L</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 120.45pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">22µF/25V/1206/X5R</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.9pt; height: 17pt;"> <p class="Tablebadyright">1206</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.75pt; height: 17pt; white-space: nowrap;"> <p class="Tablebadyright">muRata</p> </td> </tr> <tr style="height: 1cm;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 92.15pt; height: 1cm; white-space: nowrap;"> <p class="MsoNormal">C11, C12, C13, C14</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 1cm; height: 1cm;"> <p class="MsoNormal">4</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 127.6pt; height: 1cm;"> <p class="MsoNormal">C3225X5R1E226MT</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 120.45pt; height: 1cm; white-space: nowrap;"> <p class="MsoNormal">22µF/25V/1210/X5R</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.9pt; height: 1cm;"> <p class="Tablebadyright">1210</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.75pt; height: 1cm; white-space: nowrap;"> <p class="Tablebadyright">TDK</p> </td> </tr> <tr style="height: 17pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 92.15pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">BYP/EN2/VCC</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 1cm; height: 17pt;"> <p class="MsoNormal">1</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 127.6pt; height: 17pt;"> <p class="MsoNormal">Gold PIN</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 120.45pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">Gold PIN</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.9pt; height: 17pt;"> <p class="Tablebadyright">Gold PIN</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.75pt; height: 17pt; white-space: nowrap;"> <p class="Tablebadyright">Gold PIN</p> </td> </tr> <tr style="height: 17pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 92.15pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">LDO/VCC/LDO</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 1cm; height: 17pt;"> <p class="MsoNormal">1</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 127.6pt; height: 17pt;"> <p class="MsoNormal">Gold PIN</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 120.45pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">Gold PIN</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.9pt; height: 17pt;"> <p class="Tablebadyright">Gold PIN</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.75pt; height: 17pt; white-space: nowrap;"> <p class="Tablebadyright">Gold PIN</p> </td> </tr> <tr style="height: 17pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 92.15pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">J1, J2, J3, J4</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 1cm; height: 17pt;"> <p class="MsoNormal">4</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 127.6pt; height: 17pt;"> <p class="MsoNormal">Connector</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 120.45pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">Connector</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.9pt; height: 17pt;"> <p class="Tablebadyright">Connector</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.75pt; height: 17pt; white-space: nowrap;"> <p class="Tablebadyright">Connector</p> </td> </tr> <tr style="height: 17pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 92.15pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">GND</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 1cm; height: 17pt;"> <p class="MsoNormal">2</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 127.6pt; height: 17pt;"> <p class="MsoNormal">Gold PIN</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 120.45pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">Gold PIN</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.9pt; height: 17pt;"> <p class="Tablebadyright">Gold PIN</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.75pt; height: 17pt; white-space: nowrap;"> <p class="Tablebadyright">Gold PIN</p> </td> </tr> <tr style="height: 17pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 92.15pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">JP1 ,JP2, J6</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 1cm; height: 17pt;"> <p class="MsoNormal">3</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 127.6pt; height: 17pt;"> <p class="MsoNormal">Jumper</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 120.45pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">Jumper</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.9pt; height: 17pt;"> <p class="Tablebadyright">Jumper</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.75pt; height: 17pt; white-space: nowrap;"> <p class="Tablebadyright">Jumper</p> </td> </tr> <tr style="height: 1cm;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 92.15pt; height: 1cm; white-space: nowrap;"> <p class="MsoNormal">R1, R2, R8, R10, R12, R15, R16</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 1cm; height: 1cm;"> <p class="MsoNormal">7</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 127.6pt; height: 1cm;"> <p class="MsoNormal">Shorted</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 120.45pt; height: 1cm; white-space: nowrap;"> <p class="MsoNormal">Shorted</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.9pt; height: 1cm;"> <p class="Tablebadyright">Shorted</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.75pt; height: 1cm; white-space: nowrap;"> <p class="Tablebadyright">Shorted</p> </td> </tr> <tr style="height: 17pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 92.15pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">R3, R7</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 1cm; height: 17pt;"> <p class="MsoNormal">2</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 127.6pt; height: 17pt;"> <p class="MsoNormal">0603 100K 1%</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 120.45pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">100kΩ/0603/1%</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.9pt; height: 17pt;"> <p class="Tablebadyright">0603</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.75pt; height: 17pt; white-space: nowrap;"> <p class="Tablebadyright">WALSIN</p> </td> </tr> <tr style="height: 17pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 92.15pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">R6, R13</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 1cm; height: 17pt;"> <p class="MsoNormal">2</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 127.6pt; height: 17pt;"> <p class="MsoNormal">0603 360K 1%</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 120.45pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">1mΩ/0603/1%</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.9pt; height: 17pt;"> <p class="Tablebadyright">0603</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.75pt; height: 17pt; white-space: nowrap;"> <p class="Tablebadyright">WALSIN</p> </td> </tr> <tr style="height: 39.7pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 92.15pt; height: 39.7pt; white-space: nowrap;"> <p class="MsoNormal">R4</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 1cm; height: 39.7pt;"> <p class="MsoNormal">1</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 127.6pt; height: 39.7pt;"> <p class="MsoNormal">0603 15K0 1%</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 120.45pt; height: 39.7pt; white-space: nowrap;"> <p class="MsoNormal">Shorted for RT7238B/C</p> <p class="MsoNormal">15kΩ/0603/1% for RT7238D (VOUT 1.05V)</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.9pt; height: 39.7pt;"> <p class="Tablebadyright">0603</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.75pt; height: 39.7pt; white-space: nowrap;"> <p class="Tablebadyright">WALSIN</p> </td> </tr> <tr style="height: 17pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 92.15pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">R5</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 1cm; height: 17pt;"> <p class="MsoNormal">1</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 127.6pt; height: 17pt;"> <p class="MsoNormal">0603 20K0 1%</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 120.45pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">20kΩ/0603/1%</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.9pt; height: 17pt;"> <p class="Tablebadyright">0603</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.75pt; height: 17pt; white-space: nowrap;"> <p class="Tablebadyright">WALSIN</p> </td> </tr> <tr style="height: 17pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 92.15pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">SW1</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 1cm; height: 17pt;"> <p class="MsoNormal">1</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 127.6pt; height: 17pt;"> <p class="MsoNormal">SWITCHES</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 120.45pt; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">SWITCHES</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.9pt; height: 17pt;"> <p class="Tablebadyright">SWITCHES</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.75pt; height: 17pt; white-space: nowrap;"> <p class="Tablebadyright">SWITCHES</p> </td> </tr> <tr style="height: 39.7pt;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 92.15pt; height: 39.7pt; white-space: nowrap;"> <p class="MsoNormal">EN1/EN/EN, PG, FB/FB/ILMIT, BS, LX</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 1cm; height: 39.7pt;"> <p class="MsoNormal">5</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 127.6pt; height: 39.7pt;"> <p class="MsoNormal">Test PIN</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 120.45pt; height: 39.7pt; white-space: nowrap;"> <p class="MsoNormal">Test PIN</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.9pt; height: 39.7pt;"> <p class="Tablebadyright">Test PIN</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.75pt; height: 39.7pt; white-space: nowrap;"> <p class="Tablebadyright">Test PIN</p> </td> </tr> <tr style="height: 1cm;"> <td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor #009eb8 #009eb8; padding: 0cm 5.4pt; width: 92.15pt; height: 1cm; white-space: nowrap;"> <p class="MsoNormal">U1</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 1cm; height: 1cm;"> <p class="MsoNormal">1</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 127.6pt; height: 1cm;"> <p class="MsoNormal">RT7238B/C/D</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 120.45pt; height: 1cm; white-space: nowrap;"> <p class="MsoNormal">RT7238B/C/D</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.9pt; height: 1cm;"> <p class="Tablebadyright">UQFN-10L 3x3 (FC)</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 5.4pt; width: 70.75pt; height: 1cm; white-space: nowrap;"> <p class="Tablebadyright">RICHTEK</p> </td> </tr> </tbody> </table> </div>

11. PCB Layout

<p class="23CxSpFirst"><a href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7238cgquf/html-images/image004_en.jpg" class="fancybox"><img width="491" height="354" width="491" height="354" id="圖片 7" style="border-width: 0px; border-style: solid;" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7238cgquf/html-images/image004_en.jpg" /></a></p> <p class="23CxSpLast">Top View (1st layer)</p> <p class="MsoNormal"><a href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7238cgquf/html-images/image005_en.jpg" class="fancybox"><img width="491" height="357" width="491" height="357" id="圖片 8" style="border-width: 0px; border-style: solid;" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7238cgquf/html-images/image005_en.jpg" /></a></p> <p class="10">PCB Layout—Inner Side (2^nd Layer)</p> <p class="MsoNormal"><a href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7238cgquf/html-images/image006_en.jpg" class="fancybox"><img width="491" height="356" width="491" height="356" id="圖片 9" style="border-width: 0px; border-style: solid;" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7238cgquf/html-images/image006_en.jpg" /></a></p> <p class="10">PCB Layout—Inner Side (3^rd Layer)</p> <p class="MsoNormal"><a href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7238cgquf/html-images/image007_en.jpg" class="fancybox"><img width="491" height="356" width="491" height="356" id="圖片 10" style="border-width: 0px; border-style: solid;" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7238cgquf/html-images/image007_en.jpg" /></a></p> <p class="23">Bottom View (4th Layer)</p>