Monolithic Power Systems Inc. MP86992GMJ-P

Overview

MP86992GMJ-P from Monolithic Power Systems is a monolithic half-bridge Intelli-Phase™ power stage integrating high- and low-side MOSFETs with gate drivers, delivering 50A continuous output current across 3V–16V input range. It features Accu-Sense™ bidirectional current sensing (5μA/A gain), junction temperature reporting (8mV/°C), tri-state PWM interface, and operates up to 3MHz switching frequency. It is deployed in server core voltage regulation where compact size and thermal efficiency are critical.

For engineers reviewing the MP86992GMJ-P datasheet, MP86992GMJ-P pinout, MP86992GMJ-P application, or MP86992GMJ-P equivalent, key selection criteria include its LGA-41 (5mm×6mm) thermal performance (θJB = 2.2°C/W), dead-time control (2–28ns), cycle-by-cycle current limiting (75A HS / –35A LS), and fault reporting via TOUT/FLT pin.

Technical Context

The MP86992GMJ-P implements a fully integrated half-bridge topology with internal level-shifted gate drivers and zero-crossing detection (ZCD) for diode emulation mode. Its tri-state PWM input enables seamless transition between active switching and high-impedance states without external logic, supporting multi-phase controllers requiring phase-current balancing and active voltage positioning.

It integrates analog sensing functions: IOUT provides proportional current-source output (±250μA at ±50A), while TOUT/FLT delivers temperature-proportional voltage (8mV/°C offset +800mV at 25°C) and pulls to VDD during faults-enabling unified thermal monitoring and three-fault classification (HS overcurrent, OTP >160°C, SW–PGND short) via PWM pin resistance encoding.

Key Specifications

Pinout & Package

The MP86992GMJ-P is housed in an LGA-41 package (5mm × 6mm), optimized for low thermal resistance (θJB = 2.2°C/W) and high-current PCB routing via 24 PGND pads and distributed VIN connections.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar half-bridge power stage applications.

Compared with MP86956GQ-P and ISL99390HRZ-T, the MP86992GMJ-P uniquely combines 50A capacity, integrated temperature sensing with fault classification, and tri-state PWM compatibility-making it the only option supporting closed-loop thermal throttling and seamless multi-phase synchronization in next-gen server VRMs.

Availability

MP86992GMJ-P is available at Aetrix Electronics and suitable for server core voltage regulation, GPU power delivery, AI accelerator modules, and high-density telecom rectifiers requiring stable component supply and long-term production continuity.

Supply support for MP86992GMJ-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 power management ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP86992 belongs to MPS's Intelli-Phase™ family-engineered specifically for high-current, high-frequency multi-phase buck regulators in datacenter and AI infrastructure, emphasizing thermal density, sensing fidelity, and controller interoperability.

FAQ

What is the recommended bootstrap capacitor value for MP86992GMJ-P?

A 0.1µF to 0.22µF ceramic capacitor is required between BST and SW pins. This value ensures sufficient charge transfer to maintain high-side gate drive above VIN during continuous conduction mode at 50A, especially at 1–3MHz switching frequencies. Placement must be within 2mm of the BST pin per layout guidelines.

How does the tri-state PWM function enable diode emulation mode?

When PWM is driven to 1.1–1.8V (tri-state window) or left floating, the internal current source pulls it to ~1.45V, triggering immediate HS-FET turn-off and LS-FET activation until zero-current detection occurs. This eliminates body-diode conduction loss without requiring external control logic or additional gate drivers.

Can MP86992GMJ-P operate with a 5V input supply?

Yes-its 3V–16V input range fully supports 5V intermediate bus operation. At 5V input, the device maintains 50A capability with appropriate input capacitance and thermal management; efficiency drops ~2–3% versus 12V operation due to higher conduction loss, but remains >92% at 30A per phase.

What is the purpose of connecting AGND and PGND at the VDD decoupling capacitor?

This single-point connection prevents noise coupling from high-current PGND transients into the analog reference (AGND), ensuring stable VDD regulation and accurate IOUT/TOUT/FLT sensing. It avoids ground loops that would degrade current-sense accuracy beyond the specified ±2% gain error.

How is over-temperature protection triggered and released?

OTP activates at junction temperature >160°C, latching off the HS-FET and pulling TOUT/FLT to VDD. The latch is cleared only by toggling EN, or cycling VIN/VDD power-ensuring safe thermal recovery before resuming operation. No automatic reset occurs to prevent thermal runaway.

Does MP86992GMJ-P support multi-phase current balancing?

Yes-its IOUT pin delivers real-time, bidirectional current data (5μA/A) with ±2% gain accuracy, enabling the controller to perform per-phase current measurement and dynamic duty-cycle adjustment. Combined with synchronized PWM timing (<40ns skew), this supports precise current sharing across ≥4 phases.

What is the maximum allowable negative inductor current before LS-FET shutdown?

The LS-FET shuts down at –35A valley current, with a 200ns forced HS-FET on-time to clamp further negative excursion. This protects against reverse conduction in light-load discontinuous conduction mode while avoiding false fault reporting-unlike HS overcurrent, this event does not trigger TOUT/FLT or latch.