RT8859AGQW

Overview

The RT8859AGQW is a VR12/IMVP-7 compliant CPU power controller featuring two voltage rails: a multi-phase CORE VR and a single-phase AXG VR. It utilizes G-NAVP topology for optimized AVP performance and supports mode transitions. The device includes a built-in Serial VID interface, high-accuracy DAC (0.25V to 1.52V, 5mV steps), and ADC for platform settings. Input voltage ranges from 10.8V to 13.2V, with output voltages adjustable between 0.25V and 1.52V. It operates within a temperature range of -40°C to 85°C and is housed in a 56-WQFN (7x7) package.

Feature Summary

• Implements proprietary G-NAVP topology derived from finite DC gain compensator with current mode control for easy PWM configuration.
• Integrates Serial VID interface for direct communication with Intel VR12/IMVP-7 compliant CPUs.
• Provides differential remote voltage sensing and built-in ADC for precise platform programming functions.
• Includes comprehensive fault protection mechanisms such as overvoltage, undervoltage, negative voltage, overcurrent, and UVLO.

Applications

• Intel IMVP-7 compliant CPU core power supply design
• VR12 standard processor voltage regulation modules
• Multi-phase synchronous buck controller implementations

Procurement Notes

Verify component authenticity through authorized distributors or original manufacturer channels. Confirm RoHS compliance status and lead-free soldering compatibility prior to integration. Check for obsolete status indicators as availability may be limited. Ensure packaging specifications match surface mount requirements for the 56-WQFN footprint.

Selection Notes

Select this controller for applications requiring strict adherence to Intel VR12/IMVP-7 specifications. The integrated G-NAVP topology simplifies compensation setup compared to traditional designs. Consider the dual-rail architecture if both CORE and AXG voltage regulation are needed in a single solution. Evaluate thermal management needs given the 56-pin WQFN package constraints.

Part Context

This component belongs to the Richtek RT8859 series of CPU power controllers. It is designed specifically for high-performance computing environments where precise voltage positioning and transient response are critical. The series supports various phase configurations to meet diverse processor power demands while maintaining efficiency across different load conditions.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing PCB layouts and control algorithms when considering alternative devices.

FAQ

What topology does the RT8859AGQW use for its PWM control?

It uses the proprietary G-NAVP topology, which is derived from a finite DC gain compensator with current mode control.

How does the device handle Active Voltage Positioning (AVP)?

It features a quick response mechanism for optimized AVP performance during load transients, meeting all Intel CPU requirements.

What is the accuracy of the internal DAC?

The built-in high-accuracy DAC converts SVID codes ranging from 0.25V to 1.52V with 5mV per step.