overview

1. Purpose

<p class="MsoNormal">The RT7297A 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 18V. This document explains the function and use of the RT7297A 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 class="WordSection2"> General Product Information</h3> <p class="bady">The RT7297A is a high efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 3A output current from a 4.5V to 18V input supply. The RT7297A's current mode architecture and external compensation allow the transient response to be optimized over a wide range of loads and output capacitors. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. The RT7297A also provides output under voltage protection and thermal shutdown protection. The low current (<3μA) shutdown mode provides output disconnection, enabling easy power management in battery-powered systems. The RT7297A is available in an SOP-8 (Exposed Pad) package.</p> <h3>Product Feature</h3> <ul> <li style="color: #231f20;">±1.5% High Accuracy Feedback Voltage</li> <li style="color: #231f20;">4.5V to 18V Input Voltage Range</li> <li style="color: #231f20;">3A Output Current</li> <li style="color: #231f20;">Integrated N-MOSFET Switches</li> <li style="color: #231f20;">Current Mode Control</li> <li style="color: #231f20;">Fixed Frequency Operation : 340kHz</li> <li style="color: #231f20;">Output Adjustable from 0.8V to 15V</li> <li style="color: #231f20;">Up to 95% Efficiency</li> <li style="color: #231f20;">Programmable Soft-Start</li> <li style="color: #231f20;">Stable with Low-ESR Ceramic Output Capacitors</li> <li style="color: #231f20;">Cycle-by-Cycle Over Current Protection</li> <li style="color: #231f20;">Input Under Voltage Lockout</li> <li style="color: #231f20;">Output Under Voltage Protection</li> <li style="color: #231f20;">Thermal Shutdown Protection</li> </ul>

3. Key Performance Summary Table

<div> <table class="MsoNormalTable" style="border: currentColor; width: 510.2pt; border-collapse: collapse;" cellpadding="0" cellspacing="0" border="1" width="680"> <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: PCB004_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="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: 305.85pt; 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: 164.25pt; 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: 305.85pt; height: 17pt;"> <p class="ListParagraph1CxSpLast">3A</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="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: 305.85pt; height: 17pt;"> <p class="ListParagraph1CxSpLast">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="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: 305.85pt; height: 17pt;"> <p class="ListParagraph1CxSpLast">RT7297AHZSP, PSOP-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="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: 305.85pt; height: 17pt;"> <p class="ListParagraph1CxSpLast">Steady 340kHz at all loads</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="ListParagraph1CxSpFirst">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="ListParagraph1CxSpMiddle">4.5V to 18V Input Voltage Range</p> <p class="ListParagraph1CxSpLast">Programmable Soft-Start</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="ListParagraph1CxSpFirst">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="ListParagraph1CxSpMiddle">Output Under-Voltage Protection (hiccup mode):</p> <p class="ListParagraph1CxSpMiddle">Cycle-by-cycle Current Limit</p> <p class="ListParagraph1CxSpLast">Thermal Shutdown</p> </td> </tr> </tbody> </table> </div>

4. Bench Test Setup Conditions

<h3>Headers Description and Placement</h3> <p class="MsoNormal"><a href="~/media/Richtek/Design%20Support/Technical%20Documentation/UG7297AHZSP/EN/Version1/image001.jpg" class="fancybox"><img id="圖片 1" style="width: 420px; height: 303px;" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7297ahzsp/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 <a href="mailto:evb_service@richtek.com" class="link">evb_service@richtek.com</a>.</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 class="MsoNormalTable" style="border: currentColor; width: 510.2pt; border-collapse: collapse;" cellpadding="0" cellspacing="0" border="1" width="680"> <tbody> <tr style="height: 17pt;"> <td style="background: #009eb8; padding: 0cm 5.4pt; border: 1pt solid #009eb8; width: 69.05pt; 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: 126.5pt; 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: 272.25pt; 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: 69.05pt; 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: 126.5pt; 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: 272.25pt; height: 17pt;"> <p class="ListParagraph1CxSpLast">Input voltage range= 4.5V to 18V</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: 69.05pt; 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: 126.5pt; 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: 272.25pt; height: 17pt;"> <p class="ListParagraph1CxSpMiddle">Default output voltage = 3.3V</p> <p class="ListParagraph1CxSpMiddle">Output voltage range= 0.8V to 15V </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: 69.05pt; 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: 126.5pt; 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: 272.25pt; 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: 69.05pt; 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: 126.5pt; 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: 272.25pt; 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: 69.05pt; 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: 126.5pt; 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: 272.25pt; 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: 69.05pt; height: 17pt;"> <p class="ListParagraph1CxSpFirst">SS</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: 126.5pt; height: 17pt;"> <p class="ListParagraph1CxSpMiddle">Soft-start control 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: 272.25pt; height: 17pt;"> <p class="ListParagraph1CxSpLast">Soft start 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: 69.05pt; 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: 126.5pt; 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: 272.25pt; height: 17pt;"> <p class="ListParagraph1CxSpLast">Ground</p> </td> </tr> </tbody> </table> </div>

5. Power-up & Measurement Procedure

<p class="MsoNormal">1.Apply a 12V nominal input power supply (4.5V < V_IN < 18V) to the VIN and GND terminals.</p> <p class="MsoNormal">2.The EN voltage is pulled to logic high by R4 (100kΩ to VIN) to enable operation. Drive EN high (>2.7V) to enable operation or low (<0.4V) to disable operation.</p> <p class="MsoNormal">3.Verify the output voltage (approximately 3.3V) between VOUT and GND.</p> <p class="MsoNormal">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. The output is set by the following formula:</p> <p class="MsoNormal"><a href="~/media/Richtek/Design%20Support/Technical%20Documentation/UG7297AHZSP/EN/Version1/image003.gif" class="fancybox"></a></p> <a href="~/media/Richtek/Design%20Support/Technical%20Documentation/UG7297AHZSP/EN/Version1/image003.gif" class="fancybox"> </a> <p><a href="~/media/Richtek/Design%20Support/Technical%20Documentation/UG7297AHZSP/EN/Version1/image003.gif" class="fancybox"></a><a href="~/media/Richtek/Design%20Support/Technical%20Documentation/UG6200GE/EN/Version1/image003.jpg" class="fancybox"><img id="圖片 5" style="border-width: 0px; border-style: solid; width: 139px; height: 37px;" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7297ahzsp/html-images/image003_en.jpg" /></a></p> <p class="MsoNormal">The installed VOUT 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 RT7297A IC datasheet.</p>

6. Schematic, Bill of Materials and Board Layout

<h3>EVB Schematic Diagram</h3> <p class="MsoNormal"><a href="~/media/Richtek/Design%20Support/Technical%20Documentation/UG7297AHZSP/EN/Version1/image004.gif" class="fancybox"><img id="圖片 4" style="border-width: 0px; border-style: solid; width: 680px; height: 257px;" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7297ahzsp/html-images/image004_en.gif" /></a></p> <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: 10μH TAIYO YUDEN NR8040T100M, DCR=34mΩ</p> <h3>Bill of Materials</h3> <div> <table class="MsoNormalTable" style="border: currentColor; width: 510.2pt; border-collapse: collapse;" cellpadding="0" cellspacing="0" border="1" width="680"> <tbody> <tr style="height: 17pt;"> <td style="background: #009eb8; padding: 0cm 1.4pt; border: 1pt solid #009eb8; width: 17.48%; 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: 4.18%; 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: 23.5%; 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: 23.92%; 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: 16.12%; 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: 14.8%; 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: 17.48%; 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: 4.18%; 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: 23.5%; height: 17pt;"> <p class="MsoNormal">RT7297AHZSP</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: 23.92%; 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: 16.12%; 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: 14.8%; 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: 17.48%; 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: 4.18%; 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: 23.5%; 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: 23.92%; height: 17pt;"> <p class="MsoNormal">10uF/±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: 16.12%; 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: 14.8%; 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: 17.48%; 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: 4.18%; 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: 23.5%; 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: 23.92%; height: 17pt;"> <p class="MsoNormal">22uF/±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: 16.12%; 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: 14.8%; 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: 17.48%; 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: 4.18%; 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: 23.5%; height: 17pt;"> <p class="MsoNormal">0603B472K500</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: 23.92%; height: 17pt;"> <p class="MsoNormal">4.7nF/±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: 16.12%; 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: 14.8%; 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: 17.48%; height: 17pt;"> <p class="MsoNormal">C3, C6, C10,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: 4.18%; 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: 23.5%; 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: 23.92%; height: 17pt;"> <p class="MsoNormal">0.1uF/±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: 16.12%; 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: 14.8%; 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: 17.48%; 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: 4.18%; 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: 23.5%; 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: 23.92%; 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: 16.12%; 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: 14.8%; 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: 17.48%; height: 17pt;"> <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: 4.18%; 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: 23.5%; height: 17pt;"> <p class="MsoNormal">NR8040T100M</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: 23.92%; height: 17pt;"> <p class="MsoNormal">10uH/3.1A/±20%, DCR=34mΩ, 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: 16.12%; height: 17pt;"> <p class="MsoNormal">8mmx8mmx4mm</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: 14.8%; height: 17pt;"> <p class="MsoNormal">TAIYO YUDEN</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: 17.48%; 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: 4.18%; 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: 23.5%; 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: 23.92%; 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: 16.12%; 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: 14.8%; 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: 17.48%; 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: 4.18%; 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: 23.5%; 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: 23.92%; 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: 16.12%; 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: 14.8%; 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: 17.48%; 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: 4.18%; 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: 23.5%; 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: 23.92%; height: 17pt; white-space: nowrap;"> <p class="MsoNormal">12kΩ/±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: 16.12%; 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: 14.8%; 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: 17.48%; 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: 4.18%; 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: 23.5%; 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: 23.92%; 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: 16.12%; 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: 14.8%; 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: 17.48%; height: 17pt;"> <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 1.4pt; width: 4.18%; 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: 23.5%; 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: 23.92%; 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: 16.12%; 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: 14.8%; 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: 17.48%; height: 17pt;"> <p class="MsoNormal">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: 4.18%; 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: 23.5%; 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: 23.92%; 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: 16.12%; 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: 14.8%; 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: 17.48%; 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: 4.18%; 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: 23.5%; 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: 23.92%; 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: 16.12%; 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: 14.8%; 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: 17.48%; 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: 4.18%; 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: 23.5%; 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: 23.92%; 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: 16.12%; 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: 14.8%; height: 17pt;"> </td> </tr> </tbody> </table> </div>

7. EVB Layout

<p class="1CxSpFirst"><a href="~/media/Richtek/Design%20Support/Technical%20Documentation/UG7297AHZSP/EN/Version1/image005.gif" class="fancybox"><img id="圖片 5" style="border-width: 0px; border-style: solid; width: 494px; height: 353px;" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7297ahzsp/html-images/image005_en.gif" /></a></p> <p class="1CxSpMiddle">Top View (1^stlayer)</p> <p class="1CxSpMiddle"><a href="~/media/Richtek/Design%20Support/Technical%20Documentation/UG7297AHZSP/EN/Version1/image006.gif" class="fancybox"><img id="圖片 6" style="border-width: 0px; border-style: solid; width: 495px; height: 354px;" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7297ahzsp/html-images/image006_en.gif" /></a></p> <p class="1CxSpLast">Bottom View (2^nd Layer)</p> <p class="1CxSpFirst"><a href="~/media/Richtek/Design%20Support/Technical%20Documentation/UG7297AHZSP/EN/Version1/image007.gif" class="fancybox"><img id="圖片 7" style="border-width: 0px; border-style: solid; width: 431px; height: 308px;" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7297ahzsp/html-images/image007_en.gif" /></a></p> <p class="1CxSpMiddle">Component Placement Guide—Component Side (1^stlayer)</p> <p class="1CxSpMiddle"><a href="~/media/Richtek/Design%20Support/Technical%20Documentation/UG7297AHZSP/EN/Version1/image008.gif" class="fancybox"><img id="圖片 8" style="border-width: 0px; border-style: solid; width: 430px; height: 309px;" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7297ahzsp/html-images/image008_en.gif" /></a></p> <p class="1CxSpMiddle">PCB Layout—Component Side (1^stLayer)</p> <p class="1CxSpMiddle"><a href="~/media/Richtek/Design%20Support/Technical%20Documentation/UG7297AHZSP/EN/Version1/image009.gif" class="fancybox"><img id="圖片 9" style="border-width: 0px; border-style: solid; width: 420px; height: 300px;" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7297ahzsp/html-images/image009_en.gif" /></a></p> <p class="1CxSpMiddle">Component Placement Guide—Bottom Side (2^ndlayer)</p> <p class="1CxSpMiddle"><a href="~/media/Richtek/Design%20Support/Technical%20Documentation/UG7297AHZSP/EN/Version1/image010.gif" class="fancybox"><img id="圖片 10" style="border-width: 0px; border-style: solid; width: 432px; height: 312px;" alt="Technical Document Image Preview" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt7297ahzsp/html-images/image010_en.gif" /></a></p> <p class="1CxSpMiddle">PCB Layout—Bottom Side (2^ndlayer)</p>