STMicroelectronics PM6766

Overview

PM6766 from STMicroelectronics is a 6-phase VR12.5™ digital multiphase controller compliant with 25 MHz SVID bus rev. 1.2, supporting programmable IMAX (up to 255 A), TMAX (125 °C), VBOOT (0.4–1.55 V), and ADDRESS; delivers 0.5% Vout accuracy with calibration and implements digital STVCOT™ control for Intel® microprocessor core power regulation in high-current server and desktop platforms.

For engineers reviewing the PM6766 datasheet, PM6766 pinout, PM6766 application, or PM6766 equivalent, key selection criteria include VR12.5 SVID compliance, 6-phase DPM capability, autocalibration for DCR current sense, remote sensing architecture, and embedded NVM for persistent configuration storage in CPU voltage regulator modules.

Technical Context

The PM6766 implements a fully digital control loop using ST's proprietary STVCOT™ algorithm, enabling fast transient response and phase-independent regulation across all six channels. It supports VFDE (Voltage-Frequency Dynamic Efficiency) and dynamic phase management (DPM) to maintain optimal efficiency from light to full load without sacrificing regulation speed.

It interfaces exclusively via PMBus™ v1.2 and SVID rev. 1.2, with dual-bus operation allowing simultaneous SVID command execution and PMBus configuration reads/writes. Thermal compensation uses a single NTC sensor for TM (temperature monitoring), LL (load line), and IMON (current monitor) calibration.

Key Specifications

Pinout & Package

PM6766 is housed in a VFQFPN40 5 × 5 mm, 0.5 mm pitch, 40-pin package with exposed thermal pad (EP). Pin functions are validated per STMicroelectronics DocID026061 Rev 1 (March 2014).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multiphase digital controller applications.

Compared with ISL6384IRZ-T and TPS53689RTAT, PM6766 uniquely combines VR12.5 SVID compliance, 6-phase DPM, STVCOT™ digital control, and unified NTC thermal compensation-making it the only option qualified for Intel® server-class CPU core regulation with black box fault diagnostics.

Availability

PM6766 is available at Aetrix Electronics and suitable for server CPU core regulation, high-end desktop power delivery, workstation memory subsystems, and AI accelerator board power requiring stable component supply and long-term lifecycle support.

Supply support for PM6766 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and automotive-grade components since 1987.

The PM6766 belongs to ST's VR12.5 digital multiphase controller product line, engineered specifically for high-efficiency, high-accuracy CPU and memory voltage regulation in Intel®-based enterprise and performance computing platforms.

FAQ

Does PM6766 support both SVID and PMBus simultaneously?

Yes. PM6766 operates SVID and PMBus independently: SVID handles real-time processor VID updates at 25 MHz, while PMBus manages configuration, telemetry, and fault logging at standard I²C speeds. Both buses can be active concurrently without arbitration conflict or timing interference.

What is the function of the black box recorder in PM6766?

The black box recorder captures up to 16 sequential fault events-including overvoltage, undervoltage, overcurrent, and FB disconnect-with timestamps, register snapshots, and error codes. Data persists in NVM across power cycles and is accessible via PMBus for root-cause analysis without external debug tools.

Can PM6766 be used with DrMOS devices from vendors other than ST?

Yes. PM6766 supports flexible driver interface timing and gate-drive signal polarity configuration, enabling interoperability with industry-standard DrMOS devices from Infineon, Vishay, ON Semiconductor, and others-verified through ST's reference designs using IR35201 and TDA21472.

Is autocalibration performed automatically at power-on?

Autocalibration runs once during initial power-up and may be triggered manually via PMBus command. It calibrates voltage sense offset/gain and current sense gain using internal references and known load conditions, eliminating need for external trim components or factory calibration fixtures.