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The RT9478M is a 4-switch bidirectional buck-boost Narrow Voltage DC (NVDC) charge controller, designed to charge 2- to 4-cell batteries from a wide range of DC power sources, including USB-C Power Delivery (PD) sources, conventional AC-DC charger adapters, and mobile batteries. The device’s SMBus serial communication interface allows for flexible programming of various parameters, including charging current, charging voltage, and protection thresholds for overvoltage and undervoltage conditions affecting the input, battery, and system outputs.The recommended junction temperature range is -40°C to 125°C, and the ambient temperature range is -40°C to 85°C.
RT9478M Typical Circuit
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<div class="spec-list"><ul class="lv1"><li>Programmable Frequency: 720kHz/800kHz/1.2MHz </li><li>Wide Input Voltage Range from 3.8V to 26V <ul class="lv2"> <li></li><li>Average Input Current Regulation (AICR) </li><li>Minimum Input Voltage Regulation (MIVR) </li></ul> </li><li>Support 10mΩ and 5mΩ Sensing Resister </li><li>High Accuracy for 2% Battery Charge Current and 0.5% Voltage Regulation </li><li>Wide Battery Regulation Voltage Range from 5V to 19.2V </li><li>Support USB On-The-Go (OTG) </li><li>5V NMOSFET Gate Driver </li><li>8-Bit A/D Converter for Monitor Functions <ul class="lv2"> <li></li><li>Input, System and Battery Voltage </li><li>Input and Battery Current </li><li>System Power </li><li>Independent Comparator Input Voltage </li><li>Input (IBUS) and Battery (IBAT) Current </li></ul> </li><li>Low Battery Quiescent Current </li><li>Programmable System Overvoltage Protection </li><li>Protection <ul class="lv2"> <li></li><li>Input, System and Battery Overvoltage </li><li>System Undervoltage Protection </li><li>Input and Battery Overcurrent Protection </li><li>Over-Temperature Protection </li></ul> </li><li>SMBus Compliant Serial Communication </li></ul></div>
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RT9478M Ordering Information
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<div class="spec-list"><ul class="lv1"><li>Drones </li><li>Portable Speakers </li><li>Portable Devices and Accessories </li></ul></div>
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