Monolithic Power Systems Inc. MP2953BGU-0000-Z

Overview

MP2953BGU-0000-Z from Monolithic Power Systems is a digital 6-phase PWM controller compliant with Intel VR12.5 specifications, designed to regulate core voltage for high-performance CPUs and GPUs. It delivers precise load-line regulation, supports 1–6 phase operation, integrates on-chip EEPROM for configuration storage, and interfaces via PMBus and SVID for real-time monitoring and programming in server and telecom VR applications.

For engineers reviewing the MP2953BGU-0000-Z datasheet, MP2953BGU-0000-Z pinout, MP2953BGU-0000-Z application, or MP2953BGU-0000-Z equivalent, key selection considerations include VR12.5 compliance, 6-phase current balancing, PMBus programmability, differential remote sensing (VOSEN/VORTN), and integrated 3.3V/1.8V LDOs for system-level power sequencing and fault reporting.

Technical Context

The MP2953B implements a digital non-linear control architecture that unifies steady-state and transient response within a single power loop, eliminating separate compensation for load steps. It uses per-phase current sensing (CS1–CS6) and a summed CS_SUM signal to enable active phase-to-phase current balancing and accurate IMON-based total load current reporting.

Its dual-interface design integrates SVID for CPU-side VID commands and PMBus for system-level telemetry (voltage, current, temperature, power), while built-in protection logic handles RVP/OVP/UVP/OCP/OTP/UVLO with configurable responses (latch, hiccup, retry). The controller dynamically adjusts switching frequency per phase during transients to minimize output capacitor requirements.

Key Specifications

Pinout & Package

MP2953BGU-0000-Z is housed in a 5mm × 5mm QFN-40 package with exposed thermal pad (AGND-connected) for enhanced thermal dissipation in high-current VR applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital multi-phase VR controller applications.

Compared with MP2953BGU-0000-Z, MP2965 offers VR13 readiness and higher-resolution telemetry but requires updated firmware integration, while ISL6367IRZ provides pin-compatible analog control at lower system cost but sacrifices programmability and modern protection flexibility.

Availability

MP2953BGU-0000-Z is available at Aetrix Electronics and suitable for server core voltage regulation, GPU power delivery, and telecom base station VR applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for MP2953BGU-0000-Z 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, motion control, and automotive systems.

The MP2953B belongs to MPS's VR controller product line, engineered specifically for Intel VR12.5-compliant CPU/GPU core regulation with emphasis on digital control precision, PMBus telemetry, and seamless integration with MPS Intelli-Phase power stages.

FAQ

What is the function of the CS_SUM pin?

The CS_SUM pin aggregates total phase current from all active Intelli-Phase drivers via external current-sense resistors. It serves as the primary input for IMON analog current reporting and OCP detection, enabling accurate total load current measurement and overcurrent protection independent of individual phase currents.

Can MP2953BGU-0000-Z operate with fewer than six phases?

Yes-the MP2953B supports 1–6 phase configurations via PMBus register MFR_VR_CONFIG [14:12]. Unused PWM outputs enter high-impedance tri-state, and active phases automatically interleave. Pin-strapping is not required; configuration is stored in EEPROM and loaded at power-on.

How does the MP2953B handle thermal throttling?

The MP2953B monitors temperature via the TEMP pin (fed by Intelli-Phase VTEMP outputs) and asserts VRHOT# when exceeding the programmed threshold (default 150°C, ±30°C hysteresis). This open-drain signal connects directly to CPU PROCHOT# to trigger automatic frequency/voltage reduction before thermal shutdown.

Is the EEPROM pre-programmed for MP2953BGU-0000-Z?

Yes-MP2953BGU-0000-Z ships with factory-default EEPROM contents corresponding to "0000" configuration code, including VR12.5 compliance settings, 6-phase operation, and standard load-line parameters. Custom configurations can be written via PMBus STORE_USER_ALL command using MPS GUI software.

What protection features are configurable via PMBus?

VIN UVLO thresholds (turn-on/off), OVP/UVP limits, OTP trip point, and fault response modes (latch/hiccup/retry/no action) are all programmable via PMBus. The MP2953B also allows dynamic adjustment of load-line slope, current limit, and phase count-all stored in EEPROM for persistent operation.

Does MP2953BGU-0000-Z require external components for SVID interface termination?

Yes-SVID lines (SDIO, SCLK, ALT#) require external pull-up resistors to VTT (1.05V) with values between 50Ω and 55Ω, as specified in electrical characteristics. Internal termination is not provided; improper termination causes timing violations and SVID communication failure during VID updates.

What is the role of the VBOOT pin?

VBOOT sets the boot voltage level during soft-start via an external resistor divider. It determines the initial target output voltage before SVID commands arrive, ensuring controlled ramp-up and preventing inrush current. Default boot voltage is 0V if left unconnected, requiring valid SVID to initiate regulation.