RT8859MGQW

Overview

The RT8859MGQW is a multi-phase PWM controller compliant with VR12 and IMVP7 standards, designed for CPU core power supplies. It integrates two voltage rails: a CORE VR synchronous buck controller supporting 4/3/2/1 phases and an AXG VR single-phase buck controller. The device operates within an input voltage range of 10.8V to 13.2V and provides output voltages from 0.25V to 1.52V. It features a built-in serial VID interface and utilizes G-NAVP topology for optimized active voltage positioning.

Feature Summary

• Integrates G-NAVP topology derived from finite DC gain compensator with current mode control for easy setting and optimized AVP performance during load transients.
• Supports mode transition functions with various operating states and includes three slew rates (Fast, Slow, and Decay) for flexible control.
• Features high-accuracy internal DAC converting SVID codes with 5mV steps and high-accuracy ADC for platform settings such as no-load offset or over-current levels.
• Provides complete fault protection including overvoltage, undervoltage, negative voltage, overcurrent, and undervoltage lockout.

Applications

• CPU core power supply for systems with AXG VR disabled
• VR12/IMVP7 compliant processor platforms
• Multi-phase synchronous buck converter designs

Procurement Notes

Verify the specific suffix 'GQW' against the manufacturer's official datasheet to confirm package type and pinout compatibility. Ensure that the ordering information matches the required phase configuration and thermal pad specifications. Cross-reference the component revision history for any packaging changes or environmental compliance updates prior to finalizing procurement orders.

Selection Notes

Select this controller when designing for Intel VR12 or IMVP7 architectures requiring integrated CORE and AXG VR management. The G-NAVP topology simplifies compensation network design compared to traditional methods. Consider the 56-WQFN footprint for space-constrained applications. Validate that the input voltage range aligns with the system's bus voltage requirements.

Part Context

The RT8859M series serves as a comprehensive solution for modern CPU power delivery, combining multiple phases into a single IC. It addresses the need for precise voltage regulation and fast transient response in high-performance computing environments. The integration of digital interfaces reduces external component count and simplifies board layout for complex multi-rail power systems.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing PCB footprints and control logic before considering alternative components from other manufacturers.