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The RT8820A 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. <p align="justify">The RT8820A 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. </p><p align="justify">The RT8820A 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.</p>
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<li class="mv5"> Dual-Phase PWM Controller<br /></li><li class="mv5"> Power State Indicator<br />► 1P-CCM/2P-CCM/1P-DEM/2P-DEM<br /></li><li class="mv5"> Two Embedded MOSFET Drivers and Embedded Switching Boot Diode<br /></li><li class="mv5"> Support 1.8V PWM-VID Interface<br /></li><li class="mv5"> External Reference Input Control<br /></li><li class="mv5"> PWM-VID Dynamic Voltage Control<br /></li><li class="mv5"> Dynamic Phase Number Control<br /></li><li class="mv5"> Lossless R<sub>DS(ON)</sub> Current Sensing for Current Balance<br /></li><li class="mv5"> Internal/External Soft-Start<br /></li><li class="mv5"> Adjustable Current Limit Threshold<br /></li><li class="mv5"> Adjustable Switching Frequency<br /></li><li class="mv5"> UVP/OVP Protection<br /></li><li class="mv5"> Shoot Through Protection and Short Pulse Free Technology<br /></li><li class="mv5"> Support an Ultra-Low Output Voltage as Standby Voltage <br /></li><li class="mv5"> Thermal Shutdown <br /></li><li class="mv5"> Power Good Indicator (EN to PG high = 500μs)</li>
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<li class="mv5"> CPU/GPU Core Power Supply<br /></li><li class="mv5"> Desktop PC Memory, VTT Power<br /></li><li class="mv5"> Chipset/RAM Power Supply<br /></li><li class="mv5"> Generic DC-DC Power Regulator</li>
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