The RT8848A/B is a 8/7/6/5/4/3/2/1 multi-phase synchronous Buck controller which is optimized for high performance graphic microprocessor and support nVidia OVR4i+ spec with PWM-VID interface. The RT8848A/B adopts AC G-NAVPTM (Green Native AVP) which is Richtek's proprietary topology derived from finite DC gain of internal GM amplifier with current mode control. By utilizing the AC G-NAVPTM topology, the operating frequency of the RT8848A/B varies with VID, load and input voltage to further enhance the efficiency even in CCM. Besides, for current sensing application, the RT8848A/B can support either a traditional DCR network current sense from inductor or a smart power stage (SPS) which can directly provide a current monitor signal (IMON).
The RT8848A/B features external reference input and PWM-VID dynamic output voltage control, in which the output voltage is regulated and tracks external input reference voltage. The RT8848A/B can set internal RAMP amplitude through PINSETx pin and this can optimize stability and load transient performance. The RT8848A/B also provides complete fault protection functions including over-voltage protection (OVP), under-voltage protection (UVP), channel over-current limit (CH_OC), sum output current protection (SOC) and over-temperature protection (OTP).
Applications
- GPU Core Power for OVR4i+ Spec