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The RT8820 is a 2/1 phase synchronous Buck PWM controller which is optimized for high performance graphic microprocessor and computer applications. The IC integrates a Constant-On-Time (COT) PWM controller, two MOSFET drivers with internal bootstrap diodes, as well as channel current balance and protection functions including Over-Voltage Protection (OVP), Under-Voltage Protection (UVP), current limit, and thermal shutdown into the WQFN-20L 3x3 package. The RT8820 adopts R<sub>DS(ON)</sub> current sensing technique. Current limit is accomplished through continuous inductor-current-sense, while R<sub>DS(ON)</sub> current sensing is used for accurate channel current balance. Using the method of current sampling utilizes the best advantages of each technique. The RT8820 features external reference input and PWM-VID dynamic output voltage control, in which the feedback voltage is regulated and tracks external input reference voltage. Other features include adjustable switching frequency, dynamic phase number control, internal soft-start, power good indicator, and enable functions.
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<div class="spec-list"><ul class="lv1"><li>Dual-Phase PWM Controller </li><li>Power State Indicator <ul class="lv2"> <li></li><li>1P-CCM/2P-CCM/1P-DEM/2P-DEM </li></ul> </li><li>Two Embedded MOSFET Drivers and Embedded Switching Boot Diode </li><li>Support 1.8V PWM-VID Interface </li><li>External Reference Input Control </li><li>PWM-VID Dynamic Voltage Control </li><li>Dynamic Phase Number Control </li><li>Lossless R<sub>DS(ON)</sub> Current Sensing for Current Balance </li><li>Internal/External Soft-Start </li><li>Adjustable Current Limit Threshold </li><li>Adjustable Switching Frequency </li><li>UVP/OVP Protection </li><li>Shoot Through Protection and Short Pulse Free Technology </li><li>Support an Ultra-Low Output Voltage as Standby Voltage </li><li>Thermal Shutdown </li><li>Power Good Indicator (EN to PG high = 500μs) </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>CPU/GPU Core Power Supply </li><li>Desktop PC Memory, VTT Power </li><li>Chipset/RAM Power Supply </li><li>Generic DC-DC Power Regulator </li></ul></div>
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