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The RT3645 is a synchronous VR controller with quadruple output rails and is fully compliant with Intel IMVP9.3 PWM specification. The RT3645 adopts Richtek’s new generation of hybrid control architecture. The hybrid control achieves fast dynamic response without using external passive components for loop compensation. The control loop settings can be easily programmed through the I²C interface, simplifying the process of setting the droop control to meet all AVP (Adaptive Voltage Positioning) requirements for CPU core power. The RT3645 features Richtek’s new generation transient technique, AQR (Adaptive Quick Response), to optimize AVP performance during load transients and reduce output capacitance. The RT3645 controller adopts SPM (Smart Phase Management) technique with programmable current thresholds and hysteresis to optimize system efficiency. The RT3645 incorporates a high-accuracy ADC for multiple signal telemetry, including input voltage, output current, temperature sensing for each rail and system power monitoring. An MTP NVM (Multiple-Time Programmable Non-Volatile Memory) is integrated into the RT3645 to store custom configurations, such as droop control settings, ICCMAX current, switching frequency, and SPM current thresholds. The configurations can be selected by placing a specified resistor between the ADDR pin and GND. The RT3645 also supports fault protections, including undervoltage-lockout (UVLO), undervoltage (UV), overvoltage (OV), overcurrent (OC), and SPS fault indication. The recommended junction temperature range is -40°C to 125°C.

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