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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
Technical Documents
TitleLast UpdateShareDownload
How PCB Mismatch Affects Common-N DCR Current Sensing in Multi-phase Applications2022/11/27
Richtek Selection Guide [Oct., 2022]2022/11/03
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT8848AGQWWQFN5x5-401500 Request Buy from Distributor
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