overview

1. Purpose

<p class="MsoNormal">The RT7272B is a high-efficiency current mode synchronous step-down regulator that can deliver up to 3A output current from a wide input voltage range of 4.5V to 36V. This document explains the function and use of the RT7272B 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 Information</h3> <p class="bady">The RT7272B is a high efficiency, current mode synchronous step-down DC/DC converter that can deliver up to 3A output current over a wide input voltage range from 4.5V to 36V. The device integrates a 150mΩ high side and an 80mΩ low side MOSFET to achieve high conversion efficiency up to 95%. The current mode control architecture supports fast transient response and uses a simple compensation circuit.</p> <p class="bady">A cycle-by-cycle current limit function provides protection against a shorted output and an internal soft-start eliminates input surge current during start-up. The RT7272B provides complete protection functions such as input under voltage lockout, output under voltage protection, over current protection and thermal shutdown. </p> <p class="bady">The RT7272B is available in the thermal enhanced SOP-8 (Exposed Pad) package.</p> <h3>Product Feature</h3> <ul> <li style="color: #231f20;">4.5V to 36V Input Voltage Range</li> <li style="color: #231f20;">3A Output Current</li> <li style="color: #231f20;">Internal N-MOSFETs</li> <li style="color: #231f20;">Current Mode Control</li> <li style="color: #231f20;">Fixed Frequency Operation : 500kHz</li> <li style="color: #231f20;">Adjustable Output Voltage from 0.8V to 30V</li> <li style="color: #231f20;">High Efficiency Up to 95%</li> <li style="color: #231f20;">Stable with Low ESR Ceramic Output Capacitors</li> <li style="color: #231f20;">Cycle-by-Cycle Current Limit</li> <li style="color: #231f20;">Adjustable Current Limit</li> </ul>

3. Key Performance Summary Table

<div> <table width="680" class="MsoNormalTable" 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: 164.25pt; 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: 305.85pt; height: 17pt;"> <p class="ListParagraph1CxSpLast">Evaluation board number: PCB001_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: 164.25pt; height: 17pt;"> <p class="1CxSpFirst">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: 305.85pt; height: 17pt;"> <p class="1CxSpLast">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: 164.25pt; height: 17pt;"> <p class="1CxSpFirst">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: 305.85pt; height: 17pt;"> <p class="1CxSpLast">3A (OCP level set to 5.5A typical by R_LIM = 137kΩ)</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: 164.25pt; height: 17pt;"> <p class="1CxSpFirst">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: 305.85pt; height: 17pt;"> <p class="1CxSpLast">3.3V</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: 164.25pt; height: 17pt;"> <p class="1CxSpFirst">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: 305.85pt; height: 17pt;"> <p class="1CxSpLast">RT7272BGSP, SOP-8 (Exposed Pad)</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: 164.25pt; height: 17pt;"> <p class="1CxSpFirst">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: 305.85pt; height: 17pt;"> <p class="1CxSpLast">Steady 500kHz at PWM</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: 164.25pt; height: 17pt;"> <p class="1">Other Key Features</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: 305.85pt; height: 17pt;"> <p class="MsoNormal">4.5V to 36V Wide Input Voltage Range</p> <p class="MsoNormal">Adjustable Current Limit 2A to 6A</p> <p class="MsoNormal">PSM/ PWM Auto Switched.</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: 164.25pt; height: 17pt;"> <p class="1">Protection</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: 305.85pt; height: 17pt;"> <p class="MsoNormal">Over Current Protection &</p> <p class="MsoNormal">Output Under-Voltage-Protection (hiccup mode)</p> <p class="MsoNormal">Input Under-voltage Lock-out, Thermal Shutdown</p> </td> </tr> </tbody> </table> </div>

4. Bench Test Setup Conditions

<h3>Headers Description and Placement</h3> <p class="MsoNormal"><a href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7272bgsp/html-images/image001_en.jpg" class="fancybox"><img width="421" height="302" width="421" height="302" id="圖片 1" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7272bgsp/html-images/image001_en.jpg" /></a></p> <p class="1">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 <span style="text-decoration: underline;">evb_service@richtek.com</span>.</p> <h3>Test Points</h3> <p class="MsoNormal">The EVB is provided with the test points and pin names listed in the table below.</p> <div> <table width="680" class="MsoNormalTable" 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: 2cm; height: 17pt;"> <p class="1CxSpFirst">Test point/</p> <p class="1CxSpMiddle">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: 120.5pt; height: 17pt;"> <p class="1CxSpMiddle">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: 304.75pt; height: 17pt;"> <p class="1CxSpLast">Comment (expected waveforms or voltage levels on test points)</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: 2cm; 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: 120.5pt; height: 17pt;"> <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: 304.75pt; height: 17pt;"> <p class="ListParagraph1CxSpLast">Input voltage range= 4.5V to 36V</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: 2cm; height: 17pt;"> <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: 120.5pt; height: 17pt;"> <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: 304.75pt; height: 17pt;"> <p class="ListParagraph1CxSpMiddle">Default output voltage = 3.3V</p> <p class="ListParagraph1CxSpMiddle">Output voltage range= 0.8V to 30V </p> <p class="ListParagraph1CxSpLast">(see ‘’ Output Voltage Setting’’ section for changing output voltage level)</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: 2cm; height: 17pt;"> <p class="ListParagraph1CxSpFirst">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: 120.5pt; height: 17pt;"> <p class="ListParagraph1CxSpMiddle">Switching 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: 304.75pt; height: 17pt;"> <p class="ListParagraph1CxSpLast">SW waveform</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: 2cm; height: 17pt;"> <p class="ListParagraph1CxSpFirst">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: 120.5pt; height: 17pt;"> <p class="ListParagraph1CxSpMiddle">Enable 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: 304.75pt; height: 17pt;"> <p class="ListParagraph1CxSpLast">Enable signal. EN is automatically pulled high (by R4) to enable operation. Connect EN low to disable operation.</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: 2cm; height: 17pt;"> <p class="ListParagraph1CxSpFirst">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: 120.5pt; height: 17pt;"> <p class="ListParagraph1CxSpMiddle">Boot strap supply 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: 304.75pt; height: 17pt;"> <p class="ListParagraph1CxSpLast">Floating supply voltage for the high-side N-MOSFET 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: 2cm; height: 17pt;"> <p class="ListParagraph1CxSpFirst">MODE</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: 120.5pt; height: 17pt;"> <p class="ListParagraph1CxSpMiddle">RLIM 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: 304.75pt; height: 17pt;"> <p class="ListParagraph1CxSpLast">Current limit setting point</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: 2cm; 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: 120.5pt; 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: 304.75pt; height: 17pt;"> <p class="ListParagraph1CxSpLast">Ground</p> </td> </tr> </tbody> </table> </div>

5. Power-up & Measurement Procedure

<p class="ListParagraph1CxSpFirst">1.Apply a 12V nominal input power supply (4.5V < V_IN < 36V) to the VIN and GND terminals.</p> <p class="ListParagraph1CxSpMiddle">2.The EN voltage is pulled to logic high by R4 (100kΩ to VIN) to enable operation. Drive EN high (>2.0V) to enable operation or low (<0.4V) to disable operation.</p> <p class="ListParagraph1CxSpMiddle">3.Verify the output voltage (approximately 3.3V) between VOUT and GND.</p> <p class="ListParagraph1CxSpLast">4.Connect an external load up to 3A to the VOUT and GND terminals and verify the output voltage and current. </p> <h3>Output Voltage Setting</h3> <p class="MsoNormal">Set the output voltage with the resistive divider (R1, R2) between VOUT and GND with the midpoint connected to FB through RCAMP. The output is set by the following formula:</p> <p class="MsoNormal"><a href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7272bgsp/html-images/image002_en.png" class="fancybox"><img width="139" height="36" width="139" height="36" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7272bgsp/html-images/image002_en.png" /></a></p> <p class="MsoNormal">The installed V_OUT capacitors (C4, C5) are 22μF, 16V X5R ceramic types. Do not exceed their operating voltage range and consider their voltage coefficient (capacitance vs. bias voltage) and ensure that the capacitance is sufficient to maintain stability and provide sufficient transient response for your application. This can be verified by checking the output transient response as described in the RT7272B IC datasheet.</p>

6. Schematic, Bill of Materials and Board Layout

<h3>EVB Schematic Diagram</h3> <h3><a name="_Toc381976803"></a><a href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7272bgsp/html-images/image004_en.png" class="fancybox"><img width="680" height="331" width="680" height="331" id="圖片 2" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7272bgsp/html-images/image004_en.png" /></a></h3> <p class="MsoNormal">C1, C2: 10μF/50V/X5R, 1206, TDK C3216X5R1H106K</p> <p class="MsoNormal">C4, C5: 22μF/16V/X5R, 1210, Murata GRM32ER61C226K</p> <p class="MsoNormal">L1: 4.7μH WE74437368047, DCR=15mΩ </p> <h3>Bill of Materials</h3> <table width="0" class="MsoNormalTable" 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 1.4pt; border: 1pt solid #009eb8; width: 15.82%; 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 1.4pt; width: 5.54%; 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 1.4pt; width: 22.98%; 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 1.4pt; width: 20.86%; 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 1.4pt; width: 21.06%; 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 1.4pt; width: 13.72%; height: 17pt;"> <p class="MsoNormal">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 1.4pt; width: 15.82%; 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 1.4pt; width: 5.54%; 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 1.4pt; width: 22.98%; height: 17pt;"> <p class="MsoNormal">RT7272BGSP</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 20.86%; 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 1.4pt; width: 21.06%; height: 17pt;"> <p class="MsoNormal">PSOP-8</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 13.72%; 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 1.4pt; width: 15.82%; height: 17pt;"> <p class="MsoNormal">C1, C2</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 5.54%; 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 1.4pt; width: 22.98%; 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 1.4pt; width: 20.86%; height: 17pt;"> <p class="MsoNormal">10μF/±10%/50V/X5R</p> <p class="MsoNormal">Ceramic Capacitor</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 21.06%; height: 17pt;"> <p class="MsoNormal">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 1.4pt; width: 13.72%; 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 1.4pt; width: 15.82%; height: 17pt;"> <p class="MsoNormal">C4, C5</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 5.54%; 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 1.4pt; width: 22.98%; height: 17pt;"> <p class="MsoNormal">GRM32ER61C226KE20#</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 20.86%; height: 17pt;"> <p class="MsoNormal">22μF/±10%/16V/X5R</p> <p class="MsoNormal">Ceramic Capacitor</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 21.06%; height: 17pt;"> <p class="MsoNormal">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 1.4pt; width: 13.72%; 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 1.4pt; width: 15.82%; height: 17pt;"> <p class="MsoNormal">C7</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 5.54%; 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 1.4pt; width: 22.98%; height: 17pt;"> <p class="MsoNormal">0603B272K500</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 20.86%; height: 17pt;"> <p class="MsoNormal">2.7nF/±10%/50V/X7R</p> <p class="MsoNormal">Ceramic Capacitor</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 21.06%; height: 17pt;"> <p class="MsoNormal">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 1.4pt; width: 13.72%; 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 1.4pt; width: 15.82%; height: 17pt;"> <p class="MsoNormal">C3, C6, C11</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 5.54%; 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 1.4pt; width: 22.98%; height: 17pt;"> <p class="MsoNormal">C1608X7R1H104K080AA</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 20.86%; height: 17pt;"> <p class="MsoNormal">0.1μF/±10%/50V/X7R</p> <p class="MsoNormal">Ceramic Capacitor</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 21.06%; height: 17pt;"> <p class="MsoNormal">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 1.4pt; width: 13.72%; 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 1.4pt; width: 15.82%; height: 17pt;"> <p class="MsoNormal">C8, C9, C12, C13</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 5.54%; height: 17pt;"> <p class="MsoNormal">0</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 22.98%; 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 1.4pt; width: 20.86%; height: 17pt;"> <p class="MsoNormal">Not Installed</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 21.06%; height: 17pt;"> <p class="MsoNormal">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 1.4pt; width: 13.72%; height: 17pt;"></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 1.4pt; width: 15.82%; height: 17pt;" rowspan="2"> <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 1.4pt; width: 5.54%; height: 17pt;" rowspan="2"> <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 1.4pt; width: 22.98%; height: 17pt;"> <p class="MsoNormal">NR8040T4R7N</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 20.86%; height: 17pt;"> <p class="MsoNormal">4.7μH/4.1A/±30%, <br /> DCR=18mΩ, Inductor</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 21.06%; height: 17pt;"> <p class="MsoNormal">8.00mm x 8.00mm</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 13.72%; height: 17pt;"> <p class="MsoNormal">TAIYO YUDEN</p> </td> </tr> <tr style="height: 17pt;"> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 22.98%; height: 17pt;"> <p class="MsoNormal">WE74437368047</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 20.86%; height: 17pt;"> <p class="MsoNormal">4.7μH/19A/±20%, <br /> DCR=15mΩ, Inductor</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 21.06%; height: 17pt;"> <p class="MsoNormal">11mm x 10mm x 3.8mm</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 13.72%; height: 17pt;"> <p class="MsoNormal">WE</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 1.4pt; width: 15.82%; 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 1.4pt; width: 5.54%; 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 1.4pt; width: 22.98%; 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 1.4pt; width: 20.86%; height: 17pt;"> <p class="MsoNormal">75kΩ/±1%, Resistor</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 21.06%; height: 17pt;"> <p class="MsoNormal">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 1.4pt; width: 13.72%; height: 17pt;"> </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 1.4pt; width: 15.82%; 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 1.4pt; width: 5.54%; 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 1.4pt; width: 22.98%; 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 1.4pt; width: 20.86%; height: 17pt;"> <p class="MsoNormal">24kΩ/±1%, Resistor</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 21.06%; height: 17pt;"> <p class="MsoNormal">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 1.4pt; width: 13.72%; height: 17pt;"> </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 1.4pt; width: 15.82%; height: 17pt;"> <p class="MsoNormal">R3</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 5.54%; 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 1.4pt; width: 22.98%; 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 1.4pt; width: 20.86%; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">13kΩ/±1%, Resistor</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 21.06%; height: 17pt;"> <p class="MsoNormal">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 1.4pt; width: 13.72%; height: 17pt;"> </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 1.4pt; width: 15.82%; height: 17pt;"> <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 1.4pt; width: 5.54%; 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 1.4pt; width: 22.98%; 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 1.4pt; width: 20.86%; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">100kΩ/±1%, Resistor</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 21.06%; height: 17pt;"> <p class="MsoNormal">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 1.4pt; width: 13.72%; height: 17pt;"> </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 1.4pt; width: 15.82%; height: 17pt;"> <p class="MsoNormal">R5, D1, D2</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 5.54%; height: 17pt;"> <p class="MsoNormal">0</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 22.98%; 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 1.4pt; width: 20.86%; height: 17pt;"> <p class="MsoNormal">Not Installed</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 21.06%; 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 1.4pt; width: 13.72%; height: 17pt;"> </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 1.4pt; width: 15.82%; height: 17pt;"> <p class="MsoNormal">R6, RCAMP</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 5.54%; 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 1.4pt; width: 22.98%; 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 1.4pt; width: 20.86%; height: 17pt;"> <p class="MsoNormal">0Ω, Resistor</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 21.06%; height: 17pt;"> <p class="MsoNormal">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 1.4pt; width: 13.72%; height: 17pt;"> </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 1.4pt; width: 15.82%; height: 17pt;"> <p class="MsoNormal">RLIM</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 5.54%; 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 1.4pt; width: 22.98%; 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 1.4pt; width: 20.86%; height: 17pt;"> <p class="MsoNormal">137kΩ/±1%, Resistor</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 21.06%; height: 17pt;"> <p class="MsoNormal">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 1.4pt; width: 13.72%; height: 17pt;"> </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 1.4pt; width: 15.82%; height: 17pt;"> <p class="MsoNormal">TP</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 5.54%; 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 1.4pt; width: 22.98%; 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 1.4pt; width: 20.86%; height: 17pt;"> <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 1.4pt; width: 21.06%; 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 1.4pt; width: 13.72%; height: 17pt;"> </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 1.4pt; width: 15.82%; height: 17pt;"> <p class="MsoNormal">GP</p> </td> <td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor #009eb8 #009eb8 currentColor; padding: 0cm 1.4pt; width: 5.54%; 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 1.4pt; width: 22.98%; 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 1.4pt; width: 20.86%; height: 17pt;"> <p class="MsoNormal">Golden 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 1.4pt; width: 21.06%; 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 1.4pt; width: 13.72%; height: 17pt;"> </td> </tr> </tbody> </table>

7. EVB Layout

<p class="1CxSpFirst"><a href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7272bgsp/html-images/image005_en.png" class="fancybox"><img width="495" height="354" width="495" height="354" id="圖片 5" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7272bgsp/html-images/image005_en.png" /></a></p> <p class="1CxSpMiddle">Top View (1^stlayer)</p> <p class="1CxSpMiddle"><a href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7272bgsp/html-images/image006_en.png" class="fancybox"><img width="495" height="354" width="495" height="354" id="圖片 6" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7272bgsp/html-images/image006_en.png" /></a></p> <p class="1CxSpLast">Bottom View (4^thLayer)</p> <p class="1CxSpFirst"><a href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7272bgsp/html-images/image007_en.png" class="fancybox"><img width="431" height="303" width="431" height="303" id="圖片 7" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7272bgsp/html-images/image007_en.png" /></a></p> <p class="1CxSpMiddle">Component Placement Guide—Component Side (1^stlayer)</p> <p class="1CxSpMiddle"><a href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7272bgsp/html-images/image008_en.png" class="fancybox"><img width="430" height="309" width="430" height="309" id="圖片 8" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7272bgsp/html-images/image008_en.png" /></a></p> <p class="1CxSpMiddle">PCB Layout—Component Side (1^stLayer)</p> <p class="1CxSpMiddle"><a href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7272bgsp/html-images/image009_en.png" class="fancybox"><img width="413" height="295" width="413" height="295" id="圖片 9" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7272bgsp/html-images/image009_en.png" /></a></p> <p class="1CxSpMiddle">PCB Layout—Inner Side (2^nd Layer)</p> <p class="1CxSpMiddle"><a href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7272bgsp/html-images/image010_en.png" class="fancybox"><img width="413" height="295" width="413" height="295" id="圖片 10" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7272bgsp/html-images/image010_en.png" /></a></p> <p class="1CxSpMiddle">PCB Layout—Inner Side (3^rd Layer)</p> <p class="1CxSpMiddle"><a href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7272bgsp/html-images/image011_en.png" class="fancybox"><img width="417" height="295" width="417" height="295" id="圖片 11" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7272bgsp/html-images/image011_en.png" /></a></p> <p class="1CxSpMiddle">Component Placement Guide—Bottom Side (4^th Layer)</p> <p class="1CxSpMiddle"><a href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7272bgsp/html-images/image012_en.png" class="fancybox"><img width="411" height="295" width="411" height="295" id="圖片 12" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7272bgsp/html-images/image012_en.png" /></a></p> <p class="1CxSpLast">PCB Layout—Bottom Side (4^thlayer)</p>