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The RT8845B is a 4/3/2/1 phase synchronous Buck PWM controller which is optimized for high performance graphic microprocessor and computer applications. The RT8845B 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 RT8845B 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 RT8845B provides complete fault protection functions including Over-Voltage (OV), Negative Voltage (NV), Over-Current (OC) and Under-Voltage Lockout (UVLO). The RT8845B is available in the WQFN-32L 4x4 package. <p align="justify">The RT8845B 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.</p>
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  • Multi-Phase PWM Controller
  • Power State Indicator
    ► 1P-CCM/4P-CCM/1P-DEM
  • Support 1.8V PWM-VID Interface
  • External Reference Input Control
  • PWM-VID Dynamic Voltage Control
  • Dynamic Phase Number Control
  • Internal/External Soft-Start
  • Adjustable Current Limit Threshold
  • Adjustable Switching Frequency
  • UVP/OVP Protection
  • Support an Ultra-Low Output Voltage as Standby Voltage
  • Thermal Shutdown
  • Power Good Indicator
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GPU Core Supply for nVidia OVR4 + Spec.
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