Monolithic Power Systems Inc. MP86957GMJ-P

Overview

MP86957GMJ-P from Monolithic Power Systems is a monolithic half-bridge Intelli-Phase™ solution integrating high-side and low-side power MOSFETs with gate drivers in a single 5mm×6mm LGA-41 package. It delivers 70A continuous output current, supports 3V–16V input, operates up to 3MHz switching frequency, and features Accu-Sense™ current sensing and junction temperature reporting - enabling high-density, high-efficiency multiphase buck regulators for server CPU/GPU core voltage regulation.

For engineers reviewing the MP86957GMJ-P datasheet, MP86957GMJ-P pinout, MP86957GMJ-P application, or MP86957GMJ-P equivalent, this device is selected for its integrated tri-state PWM interface, ±40A valley current limiting, 2–28ns programmable dead time, real-time thermal fault flagging via TOUT/FLT, and compatibility with MPS multiphase controllers in datacenter power delivery systems.

Technical Context

The MP86957GMJ-P implements a fully integrated half-bridge topology with internal level-shifted gate drivers, zero-crossing detection (ZCD), and cycle-by-cycle current limiting on both high-side (95A limit) and low-side (–40A limit). Its tri-state PWM input enables diode emulation mode without external control logic, while the Accu-Sense™ IOUT pin provides bi-directional 5μA/A current sensing with ±2% gain accuracy over 20–70A.

Thermal management is implemented via an integrated temperature sensor with 8mV/°C gain and 800mV offset at 25°C, feeding a shared TOUT/FLT pin that reports over-temperature (145°C trip), high-side over-current, and low-side catastrophic failure. Fault flags are latched and cleared only after confirmed recovery cycles - ensuring robust operation in mission-critical server VRMs.

Key Specifications

Pinout & Package

MP86957GMJ-P uses a 5mm×6mm LGA-41 package with exposed PGND pads for thermal and electrical performance. The package integrates 41 terminals, including multiple VIN, PGND, and SW pads for low-inductance high-current routing, and dedicated analog pins (AGND, VDD, VDRV, IOUT, TOUT/FLT) isolated for signal integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP86956GMJ-P, the MP86957GMJ-P offers higher current headroom and tighter current-sense accuracy; versus ISL99390HRZ-T, it eliminates two external components (sense amp + level shifter) and reduces BOM count by 3 while enabling faster transient response via integrated diagnostics.

Availability

MP86957GMJ-P is available at Aetrix Electronics and suitable for server VRMs, GPU power delivery, AI accelerator modules, and high-density power modules requiring stable component supply, full lifecycle traceability, and RoHS-compliant packaging.

Supply support for MP86957GMJ-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 over 20 years of leadership in DC/DC converters, motor drivers, and intelligent power stages.

The MP86957GMJ-P belongs to MPS's Intelli-Phase™ family - engineered specifically for high-current, high-frequency multiphase buck regulators in cloud infrastructure, where integration, thermal reliability, and per-phase telemetry are critical.

FAQ

What is the maximum safe operating junction temperature for MP86957GMJ-P?

The absolute maximum junction temperature is 150°C, but the over-temperature fault trips at 145°C with 12°C hysteresis (clears at 133°C). Sustained operation above 125°C degrades long-term reliability; thermal design should target ≤115°C under worst-case load and ambient conditions using θJB = 2.2°C/W and proper PCB copper area.

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

When PWM voltage resides between 1.10V and 1.80V for ≥40ns, the MP86957GMJ-P disables the high-side FET and activates low-side FET conduction only during positive inductor current - emulating synchronous rectifier behavior without controller firmware changes. This reduces light-load losses and eliminates need for external zero-current detection circuits.

Can I connect multiple MP86957GMJ-P TOUT/FLT pins together in a multiphase system?

Yes - TOUT/FLT pins from multiple MP86957GMJ-P devices can be wire-OR'd to a single controller input. Since each pin is open-drain, the highest junction temperature (or first fault) dominates the signal. This enables centralized thermal monitoring and fault prioritization without additional logic, as confirmed in MPS Application Note AN-123.

What is the recommended bootstrap capacitor value and placement for MP86957GMJ-P?

A 0.1µF to 0.22µF X7R ceramic capacitor is required between BST and PHASE pins. It must be placed within 2mm of the pins using ≥20-mil traces and no vias in the BST path. Placement directly adjacent to the package minimizes ringing and ensures reliable high-side gate drive under 3MHz switching and 70A load steps.

Does MP86957GMJ-P support phase shedding in multiphase configurations?

Yes - via tri-state PWM input. Driving PWM to mid-voltage (1.1–1.8V) places the phase in high-impedance state with both FETs off, enabling seamless phase shedding without disrupting other active phases. The controller retains full current and temperature telemetry via IOUT and TOUT/FLT, allowing dynamic reactivation based on load demand.

What failure modes trigger the TOUT/FLT pin to assert, and how are they cleared?

TOUT/FLT asserts for three independent conditions: high-side over-current (8 consecutive cycles), junction temperature >145°C, or low-side catastrophic failure (HS V_DS >0.7V during on-state). All faults pull TOUT/FLT to VDD. Over-temperature clears automatically at 133°C; HS OC clears after 4 normal cycles; LS catastrophic fault requires EN toggle or VDD/VIN recycle to reset latch.

Is MP86957GMJ-P pin-compatible with earlier revisions like MP86957GMJ?

Yes - MP86957GMJ-P is a drop-in replacement for MP86957GMJ with identical pinout, electrical characteristics, and thermal performance. The "-P" suffix denotes enhanced production screening and improved ESD robustness per HBM Class 2 (≥2kV), with no layout or firmware changes required for migration.