Monolithic Power Systems Inc. MP2932GQK-LF-P

Overview

MP2932GQK-LF-P from Monolithic Power Systems is a 6-phase synchronous buck PWM controller for microprocessor core voltage regulation, supporting VR10/VR11 dynamic VID protocols with 8-bit DAC voltage programming, ±0.5% system accuracy over 1.0–1.6V ID range, and dual-edge PWM for sub-20ns load transient response in server/desktop CPU power delivery.

For engineers reviewing the MP2932GQK-LF-P datasheet, MP2932GQK-LF-P pinout, MP2932GQK-LF-P application, or MP2932GQK-LF-P equivalent, key selection criteria include phase configurability (2–6 phases), DCR/resistor current sensing support, programmable droop slope, thermal monitoring outputs (VR_HOT/VR_FAN), and Intelli-phase driver interface compatibility.

Technical Context

The MP2932 implements a dual-edge PWM architecture with per-phase current balancing logic that compares individual channel sensed currents against the average of all active channels to adjust duty cycles in real time. It integrates a differential remote-sense amplifier (20MHz bandwidth) and supports both resistor- and DCR-based current sensing with 47–53μA typical ISEN tolerance at 50μA input.

Its voltage regulation loop uses a 80dB+ open-loop gain error amplifier referenced to a DAC output set by 8-bit ID inputs (ID0–ID7), with programmable offset via OFS pin (±400mV range) and load-line droop implemented through FB-to-VDIFF resistor networks. Thermal protection is managed via NTC-based TM pin interfacing with VR_HOT and VR_FAN open-drain outputs.

Key Specifications

Pinout & Package

MP2932GQK-LF-P is housed in a 48-pin QFN package (6mm × 6mm, 0.4mm pitch) with exposed thermal pad. Pin assignment follows MPS standard layout for multiphase VR controllers, supporting direct connection to MPS Intelli-phase drivers and motherboard VR thermal sensors.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL6367IRZ and RT8803AZSP, MP2932GQK-LF-P delivers faster transient response via dual-edge PWM, native Intelli-phase driver coordination, and dedicated thermal monitoring outputs-making it optimal for high-performance server/desktop VRs requiring precise load-line control and modular thermal management.

Availability

MP2932GQK-LF-P is available at Aetrix Electronics and suitable for desktop CPU core VR, server processor power, and memory subsystem POL applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP2932GQK-LF-P 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, with design centers in the US, China, and Taiwan.

The MP2932 belongs to MPS's VR controller product line, engineered specifically for Intel/AMD CPU core voltage regulation in high-density computing platforms where fast transient response, precise droop control, and thermal telemetry are critical.

FAQ

What is the function of the OFS pin on MP2932GQK-LF-P?

The OFS pin programs a DC offset voltage between REF and DAC pins using an external resistor to GND (negative offset, 0.4V reference) or VCC (positive offset, 1.6V reference). This enables fine-tuning of no-load output voltage to meet tight CPU VDD specifications without modifying the VID code or feedback network.

How does MP2932GQK-LF-P implement current balancing across phases?

MP2932 measures individual phase currents via ISEN+/- inputs, computes their average (IAVG), then adjusts each PWM duty cycle in real time to minimize deviation from IAVG. This closed-loop balancing achieves ≤5% inter-phase current mismatch across 0–100% load, ensuring uniform thermal stress and extended MOSFET lifetime.

Can MP2932GQK-LF-P operate with only 2 active phases?

Yes-MP2932 supports 2-, 3-, 4-, 5-, or 6-phase operation. For 2-phase mode, tie PWM3 to VCC; the internal logic disables PWM4–PWM6 and configures timing for interleaved 1–2 phase sequencing, maintaining full current-sense and droop functionality with reduced component count.

What triggers the VR_RDY signal to go high?

VR_RDY goes high after successful soft-start completion: VCC, EN_PWR, and EN_VTT must exceed their POR thresholds (≥4.5V, ≥0.88V, ≥0.88V), the DAC voltage must ramp to 1.1V, hold for ≥86μs, read a valid ID code, then ramp to final VID minus offset. Any OVP/UVP event or enable pin reset pulls VR_RDY low.

Does MP2932GQK-LF-P support both DCR and resistor-based current sensing?

Yes-MP2932 accepts either method. DCR sensing uses ISEN+/- differential inputs across an RC network matching the inductor's L/DCR time constant; resistor sensing places RSENSE in series with each inductor and connects ISEN+/- across it. Both yield 47–53μA typical ISEN current at 50μA reference, enabling identical current balancing and OCP behavior.

What is the purpose of the TM pin and how is it interfaced?

The TM pin interfaces with an NTC thermistor connected between TM and GND, plus a pull-up resistor to VCC. Its voltage decreases as VR temperature rises. Internal comparators monitor TM voltage to assert VR_HOT (trip at 1.4V) and VR_FAN (trip at 1.65V), enabling discrete thermal management without external ADCs or microcontrollers.