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The RT8816A is a 2/1-phase synchronous Buck PWM controller optimized for high-performance graphic microprocessors and supports the nVidia OVR2 specification with a PWM-VID interface. 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 overvoltage protection (OVP), undervoltage protection (UVP), current limit, and thermal shutdown, all within a WQFN-20L 3x3 package.</br>The RT8816A adopts an RDS(ON) current sensing technique for current limit, which is accomplished through continuous inductor current sensing, while RDS(ON) current sensing is used for accurate channel current balance. This method of current sampling utilizes the best advantages of each technique.</br>Features of the RT8816A include an external reference input and PWM-VID dynamic output voltage control, where the feedback voltage is regulated to track an external input reference voltage. Other features include an adjustable switching frequency, dynamic phase number control, internal soft start, power good indicator, and enable functions. The recommended junction temperature range is -10°C to 105°C.
RT8816A Typical Circuit
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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 RDS(ON) 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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RT8816A Ordering Information
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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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