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The RT8845 is a 4/3/2/1 phase synchronous Buck PWM controller which is optimized for high performance graphic microprocessor and computer applications. The RT8845 adopts G-NAVP<sup>TM</sup> (Green Native AVP) which is Richtek's proprietary topology derived from finite DC gain of EA amplifier with current mode control. By utilizing the G-NAVP<sup>TM</sup> topology, the operating frequency of the RT8845 varies with VID, load and input voltage to further enhance the efficiency even in CCM. Moreover, the G-NAVP<sup>TM</sup> with CCRCOT (Constant Current Ripple COT) technology provides superior output voltage ripple over the entire input/output range. The RT8845 provides complete fault protection functions including Over-Voltage (OV), Negative Voltage (NV), Over-Current (OC) and Under-Voltage Lockout (UVLO). The RT8845 is available in the WQFN-32L 4x4 package. The RT8845 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/external soft- start, power good indicator, and enable functions.
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<div class="spec-list"><ul class="lv1"><li>Multi-Phase PWM Controller </li><li>Power State Indicator <ul class="lv2"> <li></li><li>1P-CCM/4P-CCM/1P-DEM </li></ul> </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>Internal/External Soft-Start </li><li>Adjustable Current Limit Threshold </li><li>Adjustable Switching Frequency </li><li>UVP/OVP Protection </li><li>Support an Ultra-Low Output Voltage as Standby Voltage </li><li>Thermal Shutdown </li><li>Power Good Indicator </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>GPU Core Supply for nVidia OVR4 + Spec. </li></ul></div>
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