RT8801

Description

The RT8801 is a multi-phase synchronous buck controller which is implemented with full control functions for Intel^® VR10.0/10.1-compliant CPU. The RT8801 could be operated with 2, 3 or 4 buck switching stages operating in interleaved phase set automatically. The multiphase architecture provides high output current while maintaining low power dissipation on power devices and low stress on input and output capacitors.
RT8801 is one of RichTek CPU core power solutions which integrates a specific series programming interface for the controller operation configuration. There are several registers implemented for the specific parameters configuration including VID for core power, and signal for load current indication. User can program the configuration of the parameters easily via the specific programming interface. With the implementation of RT8801, the part provides more flexibility and feature for customers advanced segment product design.
The RT8801 applies the DCR sensing technology newly as well; with such a topology, the RT8801 extracts the DCR of output inductor as sense component to deliver a more precise load line regulation and better thermal balance for next generation processor application. For current sense setting, droop tuning, V_CORE initial offset and over current protection are independent to compensation circuit of voltage loop. The feature greatly facilitates the flexibility of CPU power supply design and tuning. The DAC output of RT8801 supports VRD10.x with 6-bit VID input, precise initial value & smooth V_CORE transient at VID jump. The IC monitors the V_CORE voltage for over-voltage protection. Soft-start, over-current protection and programmable under-voltage lockout are also provided to assure the safety of microprocessor and power system. The RT8801 comes to the package of VQFN-32L 5x5.