The RT8801B is a multi-phase synchronous buck controllerwhich is implemented with full control functions for AMDK8 compliant CPU. The RT8801B could be operated with2, 3 or 4 buck switching stages operating in interleavedphase set automatically. The multiphase architectureprovides high output current while maintaining low powerdissipation on power devices and low stress on input andoutput capacitors.RT8801B is one of RichTek CPU core power solutionswhich integrates a specific series programming interfacefor the controller peration configuration. There are severalregisters implemented for the specific parametersconfiguration including VID for core power, and signal forload current indication. User can program the configurationof the parameters easily via the specific programminginterface. With the implementation of RT8801B, the partprovides more flexibility and feature for customers advancedsegment product design.The RT8801B applies the DCR sensing technology newlyas well; with such a topology, the RT8801B extracts theDCR of output inductor as sense component to deliver amore precise load line regulation and better thermalbalance for next generation processor application. Forcurrent sense setting, droop tuning, VCORE initial offsetand over current protection are independent tocompensation circuit of voltage loop. The feature greatlyfacilitates the flexibility of CPU power supply design andtuning. The DAC output of RT8801B supports AMD CPUwith 6-bit VID input, precise initial value & smooth VCOREtransient at VID jump. The IC monitors the VCORE voltagefor over-voltage protection. Soft-start, over-currentprotection and programmable under-voltage lockout arealso provided to assure the safety of microprocessor andpower system. The RT8801B comes to the package ofVQFN-32L 5x5.
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