Monolithic Power Systems Inc. MP86884-3DQKT-LF-Z

Overview

MP86884-3DQKT-LF-Z 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 6×6 mm TQFN package. It delivers 55 A continuous output current, supports 100 kHz–1 MHz switching, operates from 4.5 V to 14 V input, and features integrated current sense (±4% accuracy at 30 A), temperature sense (10 mV/°C), and tri-state PWM interface - enabling precise multi-phase buck regulation for server core voltage rails.

For engineers reviewing the MP86884-3DQKT-LF-Z datasheet, MP86884-3DQKT-LF-Z pinout, MP86884-3DQKT-LF-Z application, or MP86884-3DQKT-LF-Z equivalent, key selection criteria include its 55 A continuous current rating, 3 ns / 8 ns dead-time control, bootstrap-enabled high-side drive, integrated thermal monitoring via VTEMP, and compatibility with VR12.5 multi-phase controllers such as MP2935.

Technical Context

The MP86884 implements a fully integrated half-bridge topology with matched HS/LS silicon, driver logic, and protection circuitry on a single die. Its tri-state PWM interface enables seamless coordination with external phase controllers, while internal dead-time generation (3 ns rising / 8 ns falling) prevents shoot-through without external timing components.

Current sensing uses a 10 µA/A proportional current source on the CS pin, supporting cycle-by-cycle overcurrent detection and phase-current balancing in multi-phase systems. Junction temperature is monitored via the VTEMP pin (10 mV/°C with –100 mV offset), allowing real-time thermal feedback to system controllers.

Key Specifications

Pinout & Package

The MP86884-3DQKT-LF-Z is housed in a 34-pin 6×6 mm TQFN package with dual exposed pads (SW and PGND) for thermal and electrical performance. Pin numbering follows JEDEC MO-220 standard; top marking includes "MP86884".

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP86884-3DQKT-LF-Z, MP86957 offers higher voltage tolerance but removes tri-state control and thermal sensing, while ISL99227 trades current capacity and telemetry for lower gate drive voltage and simpler interface - making MP86884 optimal for thermally constrained, multi-phase server VRMs requiring full telemetry.

Availability

MP86884-3DQKT-LF-Z is available at Aetrix Electronics and suitable for server core voltage regulation, GPU power modules, and high-density telecom rectifiers requiring stable component supply, RoHS6 compliance, and long-term lifecycle support.

Supply support for MP86884-3DQKT-LF-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 power ICs, with design centers across Asia and North America and global manufacturing partnerships.

The MP86884 belongs to MPS's Intelli-Phase™ family - engineered specifically for high-efficiency, high-current, multi-phase buck converters in data center and AI infrastructure, where integration, thermal performance, and telemetry are critical.

FAQ

What is the recommended bootstrap capacitor value for MP86884-3DQKT-LF-Z?

The datasheet specifies a 0.22 µF to 1 µF ceramic capacitor between BST and SW pins. A 0.47 µF X7R 16 V capacitor placed adjacent to the device is typical. Values below 100 nF are prohibited due to insufficient charge hold during high-duty-cycle operation.

How does the MP86884 implement diode emulation mode?

Driving the SYNC pin low enables diode emulation: the LSFET turns off when inductor current crosses zero, eliminating reverse recovery losses. This mode is confirmed functional across –40°C to +125°C and improves light-load efficiency without requiring controller firmware changes.

Can the CS pin be used for overcurrent protection without an external controller?

No - the CS pin outputs a 10 µA/A current source requiring an external resistor to generate a voltage. Overcurrent detection and response (e.g., latch-off) are handled internally only for HS (80 A) and LS (–30 A) limits; the CS signal itself is for external monitoring and balancing.

What is the thermal resistance from junction to case (θJC) for this TQFN package?

The measured θJC is 8°C/W, per JESD51-7 on a 4-layer PCB. This value assumes proper soldering of both SW and PGND exposed pads to internal copper planes - critical for achieving rated 55 A continuous current in sustained operation.

Is the MP86884-3DQKT-LF-Z pin-compatible with earlier MP8688x revisions?

Yes - the MP86884-3DQKT-LF-Z is a RoHS-compliant, tape-and-reel variant of the MP86884DQKT. Pinout, functionality, and thermal characteristics are identical to Rev. 1.02; the suffix denotes packaging (LF = lead-free, Z = tape & reel) and does not indicate a silicon revision.

How is the VTEMP pin calibrated, and what is its measurement reference point?

VTEMP outputs a voltage equal to (T_J × 10 mV/°C) – 100 mV, referenced strictly between VTEMP and VSS pins. The –100 mV offset ensures monotonic output down to 0°C; accuracy is maintained across –40°C to +125°C junction range per characterization data.

Does the MP86884 support phase shedding in multi-phase systems?

Yes - via the tri-state PWM interface. When PWM is floated or driven to mid-state (1.45–3.20 V), the SW node enters high-impedance state, effectively disabling that phase. This behavior is explicitly supported and characterized for coordinated phase shedding with VR controllers like MP2935.