overview

1. Purpose

<p class="MsoNormal">The RT6255B is a synchronous step-down converter with Advanced Constant On-Time (ACOT™) mode control. with the input voltage range from 4.5V to 18V and provides 5A output current. This document explains the function and use of the RT6255B evaluation board (EVB), and provides information to enable operation, modification of the evaluation board and circuit to suit individual requirements.</p>

2. Introduction

<h3>General Product Information</h3> <p class="bady">The RT6255B is a high-efficiency, synchronous stepdown DC-DC converter that can deliver up to 5A output current from a 4.5V to 18V input supply. The RT6255B adopts Advanced Constant On-Time (ACOT™) control architecture to provide an ultrafast transient response with few external components and to operate in nearly constant switching frequency over line, load, and output voltage ranges.</p> <p class="bady">The RT6255B features cycle-by-cycle current limit protection against short-circuit outputs, and soft-start function to prevent inrush current during start-up. It also includes input under-voltage lockout, output under-voltage protection, and over-temperature protection (thermal shutdown) to provide safe and smooth operation in all operating conditions.</p>

3. Product Feature

<ul> <li>Input Supply Voltage Range : 4.5V to 18V</li> <li>Output Current : 5A</li> <li>Advanced Constant On-Time (ACOT™) Control for Ultrafast Transient Response</li> <li>Steady Switching Frequency : 500kHz<br /> ► Forced PWM Mode</li> <li>Optimized for Low-ESR Ceramic Output Capacitors</li> <li>Programmable Output Voltage : 0.6V to 5V</li> <li>Internal 45mΩ<span lang="EN-US" style="font-family: Symbol;"> </span>Switch and 23mΩ<span lang="EN-US" style="font-family: Symbol;"> </span>Synchronous Rectifier</li> <li>Cycle-by-Cycle Current Limit Protection</li> <li>Internal Soft-Start (Typ 1.5ms) or Externally</li> <li>Adjustable, Pre-biased Compatible Soft-Start (Only for Option with SS Pin)</li> <li>Power Good Indicator (90%) (Only for Option with PGOOD Pin)</li> <li>Output Under-Voltage Protection (UVP)</li> <li>Over-Temperature Protection (OTP)</li> <li>Input Under-Voltage Lockout (UVLO)</li> <li>Available in TSOT-23-8 (FC)Packages</li> </ul>

4. Key Performance Summary Table

<table width="682" class="MsoTableLightListAccent2" style="border: currentColor; width: 511.65pt; margin-left: 5.4pt; 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: 33.78%; 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: 66.22%; height: 17pt;"> <p class="ListParagraph1CxSpLast">Evaluation Board Number : PCB102_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: 33.78%; 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: 66.22%; height: 17pt;"> <p class="ListParagraph1CxSpLast">12V</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: 33.78%; 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: 66.22%; height: 17pt;"> <p class="ListParagraph1CxSpLast">5A</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: 33.78%; height: 17pt;"> <p class="ListParagraph1CxSpFirst">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: 66.22%; height: 17pt;"> <p class="ListParagraph1CxSpLast">5V</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: 33.78%; 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: 66.22%; height: 17pt;"> <p class="ListParagraph1CxSpLast">RT6255BHGJ8F, TSOT-23-8 (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: 33.78%; 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: 66.22%; height: 17pt;"> <p class="ListParagraph1CxSpLast">Steady 500kHz at all loads</p> </td> </tr> </tbody> </table>

5. Bench Test Setup Conditions

<h3>Headers Description and Placement</h3> <p class="MsoNormal"><a href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt6255bhgj8f/html-images/image001_en.png" class="fancybox"><img width="491" height="352" width="491" height="352" id="圖片 4" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt6255bhgj8f/html-images/image001_en.png" /></a></p> <p class="2">Carefully inspect all the components used in the EVB according to the following Bill of Materials table, and then make sure all the components are undamaged and correctly installed. If there is any missing or damaged component, which may occur during transportation, please contact our distributors or e-mail us at <a href="mailto:evb_service@richtek.com" class="link">evb_service@richtek.com</a>.</p>

6. Test Points

<p class="MsoNormal">The EVB is provided with the test points and pin names listed in the table below.</p> <table width="680" class="MsoTableLightListAccent2" style="border: currentColor; width: 510.2pt; margin-left: 6.15pt; border-collapse: collapse;" border="1" cellspacing="0" cellpadding="0"> <tbody> <tr style="height: 1cm;"> <td style="background: #009eb8; padding: 0cm 5.4pt; border: 1pt solid #009eb8; width: 13.9%; height: 1cm;"> <p class="23CxSpFirst">Test point/</p> <p class="23CxSpMiddle">Pin 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: 23.7%; height: 1cm;"> <p class="23CxSpMiddle">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: 62.4%; height: 1cm;"> <p class="23CxSpLast">Comment (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: 13.9%; 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: 23.7%; height: 1cm;"> <p class="ListParagraph1CxSpLast">Output Voltage Test Point</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: 62.4%; height: 1cm;"> <p class="MsoNormal">This pin is used to sense output voltage.</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: 13.9%; height: 17pt;"> <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: 23.7%; height: 17pt;"> <p class="ListParagraph1CxSpLast">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: 62.4%; height: 17pt;"> <p class="MsoNormal">Power input. Supplies the power switches of the device.</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: 13.9%; 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: 23.7%; 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: 62.4%; height: 17pt;"> <p class="ListParagraph1CxSpLast">This is the power return for the IC.</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: 13.9%; height: 1cm;"> <p class="ListParagraph1">BOOT</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: 23.7%; height: 1cm;"> <p class="MsoNormal">Bootstrap </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: 62.4%; height: 1cm;"> <p class="MsoNormal">Bootstrap supply for high-side gate driver. Connect a 0.1µF ceramic capacitor from LX to BOOT to power the high-side switch.</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: 13.9%; height: 17pt;"> <p class="ListParagraph1">SW</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: 23.7%; height: 17pt;"> <p class="MsoNormal">Switch Node Test Point</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: 62.4%; height: 17pt;"> <p class="MsoNormal">Connect the output LC filter from SW to the output load.</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: 13.9%; height: 1cm;"> <p class="ListParagraph1">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: 23.7%; height: 1cm;"> <p class="MsoNormal">Enable Control Input</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: 62.4%; height: 1cm;"> <p class="MsoNormal">Floating this pin or connecting this pin to logic high can enable the device and connecting this pin to GND can disable the device.</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: 13.9%; height: 1cm;"> <p class="ListParagraph1">Extra Power</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: 23.7%; height: 1cm;"> <p class="MsoNormal">External Pull High 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: 62.4%; height: 1cm;"> <p class="MsoNormal">External power supply input for PGOOD pulls high power.</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: 13.9%; height: 1cm;"> <p class="ListParagraph1">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: 23.7%; height: 1cm;"> <p class="MsoNormal">Power Good Indicator</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: 62.4%; height: 1cm;"> <p class="MsoNormal">Power good indicator. Open-drain output when the output voltage is within 90% to 120% of regulation point.</p> </td> </tr> </tbody> </table>

7. Power-up & Measurement Procedure

<p class="MsoListParagraph">1. Apply a 12V nominal input power supply (4.5V < V_IN < 18V) to the VIN and GND terminals.</p> <p class="MsoListParagraph">2. Set the jumper at JP1 to connect terminals 2 and 3, connecting EN to VIN through resistor REN, to enable</p> <p class="MsoListParagraph">operation.</p> <p class="MsoListParagraph">3. Verify the output voltage (approximately 5V) between VOUT and GND.</p> <p class="MsoListParagraph">4. Connect an external load up to 5A to the VOUT and GND terminals and verify the output voltage and current.</p>

8. Output Voltage Setting

<p class="MsoNormal">Set the output voltage with the resistive divider (R1, R2) between VOUT and GND with the midpoint connected to FB. The output is set by the following formula :</p> <p class="MsoNormal">V_OUT = V_FB x (1 + R1 / R2)</p>

9. Schematic, Bill of Materials & Board Layout

<h3>EVB Schematic Diagram</h3> <p class="21"><a name="_Toc409666848"></a><a href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt6255bhgj8f/html-images/image002_en.jpg" class="fancybox"><img width="680" height="369" width="680" height="369" id="圖片 2" style="border-width: 0px; border-style: solid;" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt6255bhgj8f/html-images/image002_en.jpg" /></a></p>

10. Bill of Materials

<table width="680" class="MsoTableLightListAccent2" style="border: currentColor; margin-left: 7.15pt; 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: 18.18%; height: 17pt;"> <p class="MsoNormal">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: 5.34%; height: 17pt;"> <p class="MsoNormal">Qty</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: 25.26%; height: 17pt;"> <p class="MsoNormal">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: 20.98%; height: 17pt;"> <p class="MsoNormal">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: 16.42%; height: 17pt;"> <p class="MsoNormal">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: 13.82%; height: 17pt;"> <p class="MsoNormal">Manufacturer</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: 18.18%; height: 17pt;"> <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: 5.34%; 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: 25.26%; height: 17pt;"> <p class="MsoNormal">RT6255BHGJ8F</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: 20.98%; height: 17pt;"> <p class="MsoNormal">DC-DC Converter</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: 16.42%; height: 17pt;"> <p class="MsoNormal">TSOT-23-8 (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: 13.82%; height: 17pt;"> <p class="MsoNormal">RICHTEK</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: 18.18%; height: 17pt;"> <p class="MsoNormal">C7, 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: 5.34%; 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: 25.26%; height: 17pt;"> <p class="MsoNormal">C3216X5R1H106K160AB</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: 20.98%; height: 17pt;"> <p class="MsoNormal">10µF/50V/X5R/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: 16.42%; height: 17pt;"> <p class="MsoNormal">C-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: 13.82%; height: 17pt;"> <p class="MsoNormal">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: 18.18%; height: 17pt;"> <p class="MsoNormal">C8, C10, CB, CSS</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: 5.34%; 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: 25.26%; height: 17pt;"> <p class="MsoNormal">GRM188R71H104KA93D</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: 20.98%; height: 17pt;"> <p class="MsoNormal">100nF/50V/X7R/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: 16.42%; height: 17pt;"> <p class="MsoNormal">C-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: 13.82%; height: 17pt;"> <p class="MsoNormal">MURATA</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: 18.18%; height: 17pt;"> <p class="MsoNormal">CFF</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: 5.34%; 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: 25.26%; height: 17pt;"> <p class="MsoNormal">0603N470J500CT</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: 20.98%; height: 17pt;"> <p class="MsoNormal">47pF/50V/NPO/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: 16.42%; height: 17pt;"> <p class="MsoNormal">C-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: 13.82%; height: 17pt;"> <p class="MsoNormal">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: 18.18%; height: 17pt;"> <p class="MsoNormal">C11, C12</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: 5.34%; 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: 25.26%; height: 17pt;"> <p class="MsoNormal">C3225X5R1E226M250AC</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: 20.98%; height: 17pt;"> <p class="MsoNormal">22µF/25V/X5R/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: 16.42%; height: 17pt;"> <p class="MsoNormal">C-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: 13.82%; height: 17pt;"> <p class="MsoNormal">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: 18.18%; height: 1cm;"> <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: 5.34%; 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: 25.26%; height: 1cm;"> <p class="MsoNormal">7447714047</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: 20.98%; height: 1cm;"> <p class="MsoNormal">4.7µH</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: 16.42%; height: 1cm;"> <p class="Default">L-10x10</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: 13.82%; height: 1cm;"> <p class="MsoNormal">Wurth Electronics</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: 18.18%; height: 17pt;"> <p class="MsoNormal">REN</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: 5.34%; 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: 25.26%; height: 17pt;"> <p class="MsoNormal">WR06X1003FTL</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: 20.98%; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">100k</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: 16.42%; height: 17pt;"> <p class="MsoNormal">R-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: 13.82%; height: 17pt;"> <p class="MsoNormal">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: 18.18%; height: 17pt;"> <p class="MsoNormal">R1</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: 5.34%; 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: 25.26%; height: 17pt;"> <p class="MsoNormal">WR06X1473FTL</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: 20.98%; height: 17pt;"> <p class="MsoNormal">147k</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: 16.42%; height: 17pt;"> <p class="MsoNormal">R-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: 13.82%; height: 17pt;"> <p class="MsoNormal">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: 18.18%; height: 17pt;"> <p class="MsoNormal">R2</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: 5.34%; 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: 25.26%; height: 17pt;"> <p class="MsoNormal">WR06X2002FTL</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: 20.98%; height: 17pt;"> <p class="MsoNormal">20k</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: 16.42%; height: 17pt;"> <p class="MsoNormal">R-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: 13.82%; height: 17pt;"> <p class="MsoNormal">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: 18.18%; height: 17pt;"> <p class="MsoNormal">RT</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: 5.34%; 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: 25.26%; height: 17pt;"> <p class="MsoNormal">WR06X4991FTL</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: 20.98%; height: 17pt;"> <p class="MsoNormal">4.99k</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: 16.42%; height: 17pt;"> <p class="MsoNormal">R-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: 13.82%; height: 17pt;"> <p class="MsoNormal">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: 18.18%; height: 17pt;"> <p class="MsoNormal">C1, L2, R3, RPG</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: 5.34%; 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: 25.26%; height: 17pt;"> </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: 20.98%; height: 17pt;"> <p class="MsoNormal">NC</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: 16.42%; height: 17pt;"> <p class="Default">C-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: 13.82%; height: 17pt;"> </td> </tr> </tbody> </table>

11. PCB Layout

<p class="23CxSpFirst"><a href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt6255bhgj8f/html-images/image003_en.jpg" class="fancybox"><img width="492" height="354" width="492" height="354" 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_rt6255bhgj8f/html-images/image003_en.jpg" /></a></p> <p class="23CxSpMiddle">Top View (1^st layer)</p> <p class="MsoNormal"><a href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt6255bhgj8f/html-images/image004_en.jpg" class="fancybox"><img width="492" height="353" width="492" height="353" 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_rt6255bhgj8f/html-images/image004_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_rt6255bhgj8f/html-images/image005_en.jpg" class="fancybox"><img width="492" height="353" width="492" height="353" 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_rt6255bhgj8f/html-images/image005_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_rt6255bhgj8f/html-images/image006_en.jpg" class="fancybox"><img width="492" height="352" width="492" height="352" id="圖片 11" style="border-width: 0px; border-style: solid;" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt6255bhgj8f/html-images/image006_en.jpg" /></a></p> <p class="MsoNormal">Bottom View (4^th Layer)</p>