overview

1. General Description

<p class="bady">The RT4823 is a boost regulator designed to provide a minimum output voltage from a single-cell Li-Ion battery or two alkaline battery series, even when the battery voltage is below system minimum. The quiescent current in shutdown mode is less than 1µA, which maximizes battery life.</p>

2. Performance Specification Summary

<p class="bady">The boost converter has an input voltage range from 1.8V to 5.5V, and the output voltage is 5V. It can operate in force bypass mode and boost mode. And the power-on inrush current and current limit are implemented serval setting for difference application. The RT4823 is available in a WL-CSP-9B 1.3x1.2 (BSC) package.</p> <p class="MsoNormal">Table 1. RT4823WSC Evaluation Board Performance Specification Summary</p> <div> <table class="MsoTableLightListAccent2" border="1" cellspacing="0" cellpadding="0" width="680" style="width:510.2pt;border-collapse:collapse;border:none"> <tr style="height:17.0pt"> <td style="border:solid #009EB8 1.0pt;background:#009EB8;padding:0cm 5.4pt 0cm 5.4pt; height:17.0pt"> <p class="ListParagraph1CxSpFirst">Specification</p> </td> <td style="border:solid #009EB8 1.0pt;border-left:none;background:#009EB8; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">Test Conditions</p> </td> <td style="border:solid #009EB8 1.0pt;border-left:none;background:#009EB8; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">Min</p> </td> <td style="border:solid #009EB8 1.0pt;border-left:none;background:#009EB8; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">Typ</p> </td> <td style="border:solid #009EB8 1.0pt;border-left:none;background:#009EB8; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">Max</p> </td> <td style="border:solid #009EB8 1.0pt;border-left:none;background:#009EB8; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpLast">Unit</p> </td> </tr> <tr style="height:17.0pt"> <td style="border:solid #009EB8 1.0pt;border-top:none;padding:0cm 5.4pt 0cm 5.4pt; height:17.0pt"> <p class="ListParagraph1CxSpFirst">Input Voltage Range</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">1.8</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">--</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">5.5</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpLast">V</p> </td> </tr> <tr style="height:17.0pt"> <td style="border:solid #009EB8 1.0pt;border-top:none;padding:0cm 5.4pt 0cm 5.4pt; height:17.0pt"> <p class="ListParagraph1CxSpFirst">Output Current</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">V_IN > 3V, V_OUT = 5V</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">0</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">--</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">1.3</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpLast">A</p> </td> </tr> <tr style="height:17.0pt"> <td style="border:solid #009EB8 1.0pt;border-top:none;padding:0cm 5.4pt 0cm 5.4pt; height:17.0pt"> <p class="ListParagraph1CxSpFirst">Default Output Voltage</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">--</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">5</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">--</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpLast">V</p> </td> </tr> <tr style="height:17.0pt"> <td style="border:solid #009EB8 1.0pt;border-top:none;padding:0cm 5.4pt 0cm 5.4pt; height:17.0pt"> <p class="ListParagraph1CxSpFirst">Operation Frequency</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">3</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">3.5</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">4</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpLast">MHz</p> </td> </tr> <tr style="height:17.0pt"> <td style="border:solid #009EB8 1.0pt;border-top:none;padding:0cm 5.4pt 0cm 5.4pt; height:17.0pt"> <p class="ListParagraph1CxSpFirst">Output Ripple Voltage</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">V_IN = 3.6V, V_OUT = 5V, I_OUT = 0.5A</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">--</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">40</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">--</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpLast">mVp-p</p> </td> </tr> <tr style="height:17.0pt"> <td style="border:solid #009EB8 1.0pt;border-top:none;padding:0cm 5.4pt 0cm 5.4pt; height:17.0pt"> <p class="ListParagraph1CxSpFirst">Line Regulation</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">I_OUT = 0.5A, V_IN = 1.8V to 4.8V, V_OUT = 5V</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">--</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">±1</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">--</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpLast">%</p> </td> </tr> <tr style="height:17.0pt"> <td style="border:solid #009EB8 1.0pt;border-top:none;padding:0cm 5.4pt 0cm 5.4pt; height:17.0pt"> <p class="ListParagraph1CxSpFirst">Load Regulation</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">V_IN = 3.6V, I_OUT = 0.2A to 1A, V_OUT = 5V</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">--</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">±1</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">--</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpLast">%</p> </td> </tr> <tr style="height:17.0pt"> <td style="border:solid #009EB8 1.0pt;border-top:none;padding:0cm 5.4pt 0cm 5.4pt; height:17.0pt"> <p class="ListParagraph1CxSpFirst">Load Transient Response</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">V_IN = 3.6V, V_OUT = 5V ,I_OUT = 50mA to 500mA</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">--</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">±3</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">--</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpLast">%</p> </td> </tr> <tr style="height:17.0pt"> <td style="border:solid #009EB8 1.0pt;border-top:none;padding:0cm 5.4pt 0cm 5.4pt; height:17.0pt"> <p class="ListParagraph1CxSpFirst">Maximum Efficiency</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">V_IN = 3.6V, V_OUT = 5V, I_OUT = 0.6A</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">--</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">93</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpMiddle">--</p> </td> <td style="border-top:none;border-left:none;border-bottom:solid #009EB8 1.0pt; border-right:solid #009EB8 1.0pt;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpLast">%</p> </td> </tr> </table> </div>

3. Power-up Procedure

<p class="MsoListParagraph">1. Connect input voltage (1.8V < V_IN < 5.5V) to the VIN pin.</p> <p class="MsoListParagraph">2. Bypass operation is set EN = Low, BP = High.</p> <p class="MsoListParagraph">3. Boost operation is set EN = High, BP = Low.</p> <p class="MsoListParagraph">4. To connect an external load to output and verify the output voltage versus applied current.</p>

4. Detailed Description of Hardware

<h3>Headers Description and Placement</h3> <p class="MsoNormal"><a class="fancybox" href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image001_en.png"><img width="491" height="350" id="圖片 4" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image001_en.png" alt="Technical Document Image Preview" /></a></p> <p class="MsoNormal">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>

5. Test Points

<p class="MsoNormal">The EVB is provided with the test points and pin names listed in the table below.</p> <table class="MsoTableLightListAccent2" border="1" cellspacing="0" cellpadding="0" width="680" style="width:510.2pt;margin-left:1.85pt;border-collapse:collapse; border:none"> <thead> <tr style="height:1.0cm"> <td width="20%" style="width:20.6%;border:solid #009EB8 1.0pt;background: #009EB8;padding:0cm 5.4pt 0cm 5.4pt;height:1.0cm"> <p class="23CxSpFirst">Test Point/</p> <p class="23CxSpMiddle">Pin Name</p> </td> <td width="79%" style="width:79.4%;border:solid #009EB8 1.0pt;border-left: none;background:#009EB8;padding:0cm 5.4pt 0cm 5.4pt;height:1.0cm"> <p class="23CxSpLast">Function</p> </td> </tr> </thead> <tr style="height:1.0cm"> <td width="20%" style="width:20.6%;border:solid #009EB8 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:1.0cm"> <p class="ListParagraph1">VIN</p> </td> <td width="79%" style="width:79.4%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:1.0cm"> <p class="MsoNormal">Input voltage positive connection. The power supply must be connected to input connectors, VIN, and GND.</p> </td> </tr> <tr style="height:17.0pt"> <td width="20%" style="width:20.6%;border:solid #009EB8 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1">EN</p> </td> <td width="79%" style="width:79.4%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="MsoNormal">Enable test point. The test point can be used to measure the enable signal.</p> </td> </tr> <tr style="height:1.0cm"> <td width="20%" style="width:20.6%;border:solid #009EB8 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:1.0cm"> <p class="ListParagraph1">VOUT</p> </td> <td width="79%" style="width:79.4%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:1.0cm"> <p class="MsoNormal">Output voltage connection. The load must be connected to output connectors, VOUT and GND.</p> </td> </tr> <tr style="height:17.0pt"> <td width="20%" style="width:20.6%;border:solid #009EB8 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1">JP1</p> </td> <td width="79%" style="width:79.4%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="MsoNormal">EN jumper. Connect EN to ground to disable, connect EN to logic high to enable.</p> </td> </tr> <tr style="height:17.0pt"> <td width="20%" style="width:20.6%;border:solid #009EB8 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpFirst">GND</p> </td> <td width="79%" style="width:79.4%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1CxSpLast">Ground. Input/Output voltage return connection.</p> </td> </tr> <tr style="height:17.0pt"> <td width="20%" style="width:20.6%;border:solid #009EB8 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1">JP5</p> </td> <td width="79%" style="width:79.4%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="MsoNormal">Switch node test point. The test point can be used to measure the switching node.</p> </td> </tr> <tr style="height:17.0pt"> <td width="20%" style="width:20.6%;border:solid #009EB8 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1">JP3</p> </td> <td width="79%" style="width:79.4%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="MsoNormal">Input voltage sense point.</p> </td> </tr> <tr style="height:17.0pt"> <td width="20%" style="width:20.6%;border:solid #009EB8 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="ListParagraph1">JP4</p> </td> <td width="79%" style="width:79.4%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="MsoNormal">Output voltage sense point.</p> </td> </tr> <tr style="height:1.0cm"> <td width="20%" style="width:20.6%;border:solid #009EB8 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:1.0cm"> <p class="ListParagraph1">JP2</p> </td> <td width="79%" style="width:79.4%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:1.0cm"> <p class="MsoNormal">BP jumper. Connect BP to ground to disable, connect BP to logic high(and EN=Low) to enable bypass function.</p> </td> </tr> </table>

6. Bill of Materials

<div> <table class="MsoTableLightListAccent2" border="1" cellspacing="0" cellpadding="0" width="683" style="border-collapse:collapse;border:none"> <tr style="height:17.0pt"> <td width="11%" style="width:11.3%;border:solid #009EB8 1.0pt;background: #009EB8;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="MsoNormal">Reference</p> </td> <td width="7%" style="width:7.38%;border:solid #009EB8 1.0pt;border-left: none;background:#009EB8;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="MsoNormal">Count</p> </td> <td width="24%" style="width:24.34%;border:solid #009EB8 1.0pt;border-left: none;background:#009EB8;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="MsoNormal">Part Number</p> </td> <td width="12%" style="width:12.16%;border:solid #009EB8 1.0pt;border-left: none;background:#009EB8;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="MsoNormal">Value</p> </td> <td width="15%" style="width:15.56%;border:solid #009EB8 1.0pt;border-left: none;background:#009EB8;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="MsoNormal">Description</p> </td> <td width="15%" style="width:15.6%;border:solid #009EB8 1.0pt;border-left: none;background:#009EB8;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="MsoNormal">Package</p> </td> <td width="13%" style="width:13.66%;border:solid #009EB8 1.0pt;border-left: none;background:#009EB8;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="MsoNormal">Manufacturer</p> </td> </tr> <tr style="height:39.7pt"> <td width="11%" style="width:11.3%;border:solid #009EB8 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="MsoNormal">C1</p> </td> <td width="7%" style="width:7.38%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="MsoNormal">1</p> </td> <td width="24%" style="width:24.34%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="MsoNormal">EMK325BJ476KM-T</p> </td> <td width="12%" style="width:12.16%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="MsoNormal">47µF</p> </td> <td width="15%" style="width:15.56%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="MsoNormal">Capacitor, Ceramic, 16V, X5R</p> </td> <td width="15%" style="width:15.6%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="MsoNormal">1210</p> </td> <td width="13%" style="width:13.66%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="MsoNormal">TAIYO YUDEN</p> </td> </tr> <tr style="height:39.7pt"> <td width="11%" style="width:11.3%;border:solid #009EB8 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="MsoNormal">C3</p> </td> <td width="7%" style="width:7.38%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="MsoNormal">1</p> </td> <td width="24%" style="width:24.34%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="MsoNormal">GRM155R60J475ME47D</p> </td> <td width="12%" style="width:12.16%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="MsoNormal">4.7µF</p> </td> <td width="15%" style="width:15.56%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="MsoNormal">Capacitor, Ceramic, 6.3V, X5R</p> </td> <td width="15%" style="width:15.6%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="MsoNormal">0402</p> </td> <td width="13%" style="width:13.66%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="MsoNormal">Murata</p> </td> </tr> <tr style="height:39.7pt"> <td width="11%" style="width:11.3%;border:solid #009EB8 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="MsoNormal">C4</p> </td> <td width="7%" style="width:7.38%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="MsoNormal">1</p> </td> <td width="24%" style="width:24.34%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="Default">GRM188R60J106ME47</p> </td> <td width="12%" style="width:12.16%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="Default">10µF</p> </td> <td width="15%" style="width:15.56%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="Default">Capacitor, Ceramic, 6.3V, X5R</p> </td> <td width="15%" style="width:15.6%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="Default">0603</p> </td> <td width="13%" style="width:13.66%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="MsoNormal">Murata</p> </td> </tr> <tr style="height:17.0pt"> <td width="11%" style="width:11.3%;border:solid #009EB8 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="MsoNormal">L1</p> </td> <td width="7%" style="width:7.38%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="MsoNormal">1</p> </td> <td width="24%" style="width:24.34%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="Default">DFE252012F-1R0M=P2</p> </td> <td width="12%" style="width:12.16%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="Default">1.0µH/3.3A</p> </td> <td width="15%" style="width:15.56%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="Default">Power Inductor</p> </td> <td width="15%" style="width:15.6%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="Default">2.5x2.0x1.2mm</p> </td> <td width="13%" style="width:13.66%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:17.0pt"> <p class="MsoNormal">Murata</p> </td> </tr> <tr style="height:39.7pt"> <td width="11%" style="width:11.3%;border:solid #009EB8 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="MsoNormal">U1</p> </td> <td width="7%" style="width:7.38%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="MsoNormal">1</p> </td> <td width="24%" style="width:24.34%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="Default">RT4823WSC</p> </td> <td width="12%" style="width:12.16%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="Default">RT4823</p> </td> <td width="15%" style="width:15.56%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="Default">Step-Up </p> <p class="Default">DC-DC Converter</p> </td> <td width="15%" style="width:15.6%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="Default">WL-CSP-9B 1.3x1.2 (BSC)</p> </td> <td width="13%" style="width:13.66%;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:39.7pt"> <p class="MsoNormal">RICHTEK</p> </td> </tr> </table> </div>

7. Typical Applications

<h3>EVB Schematic Diagram </h3> <p class="21"><a class="fancybox" href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image002_en.png"><img border="0" width="681" height="233" id="Picture 4" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image002_en.png" alt="Technical Document Image Preview" /></a></p> <p class="bady">1. C1 is placed on input side, and the capacitors are design for long wire effect. If input source is close the RT4823 then the capacitors are optional.</p> <p class="bady">2. C4 is placed on output side, and the capacitor is optional for output voltage ripple improvement.</p>

8. Measure Result

<table class="MsoNormalTable" border="1" cellspacing="0" cellpadding="0" style="margin-left:26.35pt;border-collapse:collapse;border:none"> <tr> <td width="306" style="width:229.8pt;border:solid #009EB8 1.0pt;background: #009EB8;padding:0cm 5.4pt 0cm 5.4pt"> <p class="MsoNormal">Output Ripple Measurement </p> </td> <td width="307" style="width:230.35pt;border:solid #009EB8 1.0pt;border-left: none;background:#009EB8;padding:0cm 5.4pt 0cm 5.4pt"> <p class="MsoNormal">Load Transient Response</p> </td> </tr> <tr style="height:168.2pt"> <td width="306" style="width:229.8pt;border:solid #009EB8 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:168.2pt"> <p class="MsoNormal"><a class="fancybox" href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image003_en.jpg"><img border="0" width="292" height="211" id="圖片 1" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image003_en.jpg" alt="Technical Document Image Preview" /></a></p> </td> <td width="307" style="width:230.35pt;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:168.2pt"> <p class="MsoNormal"><a class="fancybox" href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image004_en.jpg"><img border="0" width="293" height="210" id="圖片 9" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image004_en.jpg" alt="Technical Document Image Preview" /></a></p> </td> </tr> <tr> <td width="306" style="width:229.8pt;border:solid #009EB8 1.0pt;border-top: none;background:#009EB8;padding:0cm 5.4pt 0cm 5.4pt"> <p class="MsoNormal">Power On from EN </p> </td> <td width="307" style="width:230.35pt;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; background:#009EB8;padding:0cm 5.4pt 0cm 5.4pt"> <p class="MsoNormal">Output Ripple with Loading</p> </td> </tr> <tr style="height:172.95pt"> <td width="306" style="width:229.8pt;border:solid #009EB8 1.0pt;border-top: none;padding:0cm 5.4pt 0cm 5.4pt;height:172.95pt"> <p class="MsoNormal"><a class="fancybox" href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image005_en.jpg"><img border="0" width="292" height="213" id="圖片 11" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image005_en.jpg" alt="Technical Document Image Preview" /></a></p> </td> <td width="307" style="width:230.35pt;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 5.4pt 0cm 5.4pt;height:172.95pt"> <p class="MsoNormal"><a class="fancybox" href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image006_en.jpg"><img border="0" width="293" height="225" id="圖片 14" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image006_en.jpg" alt="Technical Document Image Preview" /></a></p> </td> </tr> <tr> <td width="306" style="width:229.8pt;border:solid #009EB8 1.0pt;border-top: none;background:#009EB8;padding:0cm 5.4pt 0cm 5.4pt"> <p class="MsoNormal">Short Circuit Response </p> </td> <td width="307" style="width:230.35pt;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; background:#009EB8;padding:0cm 5.4pt 0cm 5.4pt"> <p class="MsoNormal">Sine Waveform Stability</p> </td> </tr> <tr> <td width="306" style="width:229.8pt;border:solid #009EB8 1.0pt;border-top: none;padding:0cm 1.4pt 0cm 1.4pt"> <p class="MsoNormal"><a class="fancybox" href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image007_en.jpg"><img border="0" width="303" height="225" id="圖片 15" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image007_en.jpg" alt="Technical Document Image Preview" /></a></p> </td> <td width="307" style="width:230.35pt;border-top:none;border-left:none; border-bottom:solid #009EB8 1.0pt;border-right:solid #009EB8 1.0pt; padding:0cm 1.4pt 0cm 1.4pt"> <p class="MsoNormal"><a class="fancybox" href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image008_en.jpg"><img border="0" width="304" height="220" id="圖片 19" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image008_en.jpg" alt="Technical Document Image Preview" /></a></p> </td> </tr> </table>

9. Evaluation Board Layout

<p class="21"><a class="fancybox" href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image009_en.jpg"><img border="0" width="492" height="352" id="圖片 22" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image009_en.jpg" alt="Technical Document Image Preview" /></a></p> <p class="23">Figure 1. Top View (1^st layer)</p> <p class="MsoNormal"><a class="fancybox" href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image010_en.jpg"><img border="0" width="492" height="353" id="圖片 21" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image010_en.jpg" alt="Technical Document Image Preview" /></a></p> <p class="10">Figure 2. PCB Layout—Inner Side (2^nd Layer)</p> <p class="MsoNormal"><a class="fancybox" href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image011_en.jpg"><img border="0" width="491" height="352" id="圖片 23" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image011_en.jpg" alt="Technical Document Image Preview" /></a></p> <p class="10">Figure 3. PCB Layout—Inner Side (3^rd Layer)</p> <p class="MsoNormal"><a class="fancybox" href="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image012_en.jpg"><img border="0" width="491" height="352" id="圖片 24" src="/content/dam/richtek-eds/resources/evaluation-boards/evb_rt4823wsc/html-images/image012_en.jpg" alt="Technical Document Image Preview" /></a></p> <p class="MsoNormal">Figure 4. Bottom View (4^th Layer)</p>