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The RT3638 is an IMVP9.2 compliant CPU power controller that includes three voltage rails: an 8-phase synchronous buck controller for the VCCCORE VR, a single-phase synchronous buck controller for the VCCGT VR, and a single-phase synchronous buck controller for VCCSA VR. The output of each rail can be configured to support desired phase assignments up to a maximum of 8 phases for VCCCORE, single phase for VCCGT, and single phase for VCCSA. For example, the RT3638 supports output operations, such as 8+1+1, 7+1+1, and 6+1+1. The RT3638 supports the Smart Phase Management (SPM) feature, to achieve maximum efficiency in all load ranges. Thresholds for automatic phase addition or removal are user-programmable via the I²C protocol interface. The RT3638 adopts G-NAVP^TM (Green Native AVP), Richtek's proprietary topology derived from the finite DC gain of the EA amplifier with current mode control. This topology simplifies droop setting to meet all Intel CPU requirements for AVP (Adaptive Voltage Positioning). Based on the G-NAVP^TM topology, the RT3638 features a new generation of quick response mechanism (Adaptive Quick Response, AQR) to optimize AVP performance during load transients and reduce output capacitors. The RT3638 supports mode transition functions with various operating states. A serial VID (SVID) interface is built in to communicate with Intel IMVP9.2 compliant CPUs. The RT3638 offers built-in non-volatile memory (NVM) for platform setting functions, such as ICCMAX, switching frequency, or AQR trigger levels. The RT3638 provides VR ready output signals. It also features complete fault protection functions, including overvoltage (OV), overcurrent (OC), undervoltage (UV), and undervoltage-lockout (UVLO). The RT3638 is available in a WQFN-68L 8x8 package. The recommended junction temperature range is from -40°C to 125°C.

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