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The RT3609 is designed to meet Intel IMVP8 compatible CPU specification with a serial VID control interface which includes two voltage rails : a 6/5/4/3 phase synchronous buck controller, the CORE VR and a 2/1 phase synchronous buck controller, the AXG VR. The RT3609 adopts G-NAVP^TM (Green Native AVP) which is Richtek′s proprietary topology derived from finite DC gain of EA amplifier with current mode control, making it easy to set the droop to meet all Intel CPU requirements of AVP (Adaptive Voltage Positioning). Based on the G-NAVP^TM topology, the RT3609 features a new generation of quick response mechanism (Adaptive Quick Response, AQR) to optimize AVP performance during load transient and reduce output capacitors. The RT3609 supports mode transition function with various operating states. A serial VID (SVID) interface is built in the RT3609 to communicate with Intel IMVP8 compliant CPU. The RT3609 supports VID on-the-fly function with three different slew rates: Fast, Slow and Decay. By utilizing the G-NAVP^TM topology, the operating frequency of the RT3609 varies with VID, load and input voltage to further enhance the efficiency even in CCM. Moreover, the G-NAVP^TM with CCRCOT (Constant Current Ripple COT) technology provides superior output voltage ripple over the entire input/output range. The built-in high accuracy DAC converts the SVID code ranging from 0V to 1.52V with 5mV per step. The RT3609 integrates a high accuracy ADC for platform and function settings, such as ICCMAX, switching frequency, over-current threshold and AQR trigger level. The RT3609 provides VR Ready and thermal indicators. It also features complete fault protection functions, including over-voltage (OV), under-voltage (UV), over-current (OC) and under-voltage lockout (UVLO). The RT3609 supports several functions which can be set by I²C interface, like thermal balance adjustment, dynamic load line, voltage offset setting, fix VID setting, protection report, protection disable and Current/PSYS/Temperature report.

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