<h1>RT9466/RT9467 Charge Flow</h1> <br><br> <h2 id="__Bookmark__0">Abstract</h2> <p class=MsoNormal>In portable device applications, host changes adapter’s output to high voltage is a general solution to achieve fast charge. This application note provides charge profile of the RT9466/RT9467 to users. Please users must to follow the charge profile to control the RT9466/RT9467 VBUS voltage.</p> <br><br> <h2 id="__Bookmark__1">1. Charge System Structure</h2> <p class=MsoNormal>The general function block of switching charge as Figure 1. The host controls VBUS voltage via PD controller or RT9466/RT9467 PE+ protocol. The gauge device provides battery capacity information to host. The RT9466/RT9467 main duty is to complete the charge cycle and provide charge status to host. The host controls the RT9466/RT9467 charge condition via I²C interface.</p> <p class=MsoNormal><a class="fancybox" href="/content/dam/richtek-eds/resources/application-notes/an065/html-images-en/image001_en.png" ><img width=627 height=430 id="圖片 12" src="/content/dam/richtek-eds/resources/application-notes/an065/html-images-en/image001_en.png" alt="Technical Document Image Preview"></a></p> <p class=MsoCaption><a name="_Ref72229119">Figure </a>1. Functional Block for Switching Charger</p> <br><br> <h2 id="__Bookmark__2">2. Charge Profile Introduction for Low VBUS Charge Condition</h2> <p class=MsoNormal>The Figure 2 is charge profile for V_BUS = 5V condition. Host set the V_BUS to 5V by PD protocol or PE+ protocol. Users can use gauge device to determine battery charge level.</p> <p class=MsoNormal><a class="fancybox" href="/content/dam/richtek-eds/resources/application-notes/an065/html-images-en/image002_en.png" ><img width=679 height=328 src="/content/dam/richtek-eds/resources/application-notes/an065/html-images-en/image002_en.png" alt="Technical Document Image Preview"></a></p> <p class=MsoCaption><a name="_Ref72229087">Figure </a>2. Charge Profile for V_BUS = 5V Charge Condition</p> <br><br> <h2 id="__Bookmark__3">3. Charge Profile Introduction for High VBUS Charge Condition</h2> <p class=MsoNormal>The Figure 3 is charge profile for V_BUS higher than 5V condition. In trickle charge and pre-charge period, host sets the VBUS voltage to 5V via PD or PE+ protocol. After battery enter fast charge level, host changes VBUS higher than 5V to increase charge current. After battery capacity higher than 85% and charge current lower than 1A, users must to change V_BUS to 5V to finish charge cycle.</p> <p class=MsoNormal><a class="fancybox" href="/content/dam/richtek-eds/resources/application-notes/an065/html-images-en/image003_en.png" ><img width=679 height=342 src="/content/dam/richtek-eds/resources/application-notes/an065/html-images-en/image003_en.png" alt="Technical Document Image Preview"></a></p> <p class=MsoCaption><a name="_Ref72229073">Figure </a>3. Charge Profile for V_BUS &gt; 5V Charge Condition</p> <br><br><br> <table style="width: 637.5pt; border-collapse: collapse; border: medium none;" class="3-51" border="1" cellpadding="0" cellspacing="0"> <tbody> <tr style="height: 17pt;"> <td style="border-width: 1pt 1px 1px 1pt; border-style: solid; border-color: #009eb8; background-color: #009eb8; background-image: url(e); background-repeat: repeat; background-attachment: scroll; background-clip: border-box; background-origin: padding-box; background-size: auto auto; padding-right: 5pt; padding-left: 5pt; height: 17pt;" colspan="2"> <span style="color: #ffffff;">Next Steps</span> </td> </tr> <tr style="height: 17pt;"> <td style="border-width: 1pt 1px 1px 1pt; border-style: solid; border-color: #009eb8; background-color: #ffffff; background-image: url(e); background-repeat: repeat; background-attachment: scroll; background-clip: border-box; background-origin: padding-box; background-size: auto auto; padding-right: 5pt; padding-left: 5pt; height: 17pt;"> Richtek Newsletter </td> <td style="border-width: 1pt 1px 1px 1pt; border-style: solid; border-color: #009eb8; background-color: #ffffff; background-image: url(e); background-repeat: repeat; background-attachment: scroll; background-clip: border-box; background-origin: padding-box; background-size: auto auto; padding-right: 5pt; padding-left: 5pt; height: 17pt;"> <a class="link" href="http://www.richtek.com/My%20Richtek/Newsletters" target="_blank">Subscribe Richtek Newsletter</a> </td> </tr> <tr style="height: 17pt;"> <td style="border-width: 1pt 1px 1px 1pt; border-style: solid; border-color: #009eb8; background-color: #ffffff; background-image: url(e); background-repeat: repeat; background-attachment: scroll; background-clip: border-box; background-origin: padding-box; background-size: auto auto; padding-right: 5pt; padding-left: 5pt; height: 17pt;"> Download </td> <td style="border-width: 1pt 1px 1px 1pt; border-style: solid; border-color: #009eb8; background-color: #ffffff; background-image: url(e); background-repeat: repeat; background-attachment: scroll; background-clip: border-box; background-origin: padding-box; background-size: auto auto; padding-right: 5pt; padding-left: 5pt; height: 17pt;"> <a class="link" href="~/media/AN%20PDF/AN065_EN.ashx">Download PDF</a> </td> </tr> </tbody> </table> <br><br><br>

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