Monolithic Power Systems Inc. MP86884DQKT-LF-Z

Overview

MP86884DQKT-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 frequency, 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 compatibility - deployed in multi-phase buck regulators for server core voltage regulation.

For engineers reviewing the MP86884DQKT-LF-Z datasheet, MP86884DQKT-LF-Z pinout, MP86884DQKT-LF-Z application, or MP86884DQKT-LF-Z equivalent, key selection criteria include verified 55 A continuous current capability, validated dead-time control (3 ns rising / 8 ns falling), integrated thermal monitoring via VTEMP, and compatibility with VR12.5 controllers such as MP2935 in 4-phase configurations.

Technical Context

The MP86884 functions as a self-contained half-bridge power stage with internal HS/LS FETs and driver logic, eliminating external gate drive components. Its tri-state PWM interface enables seamless integration with multi-phase controllers supporting diode emulation mode (via SYNC pin) and phase current balancing via summed CS outputs.

Thermal management is implemented through a dedicated VTEMP pin delivering junction temperature-proportional voltage (10 mV/°C offset −100 mV), while current sensing uses a 10 μA/A current source referenced to PGND. Protection includes cycle-by-cycle overcurrent limiting (HS: 80 A, LS: −30 A) and UVLO on VIN (4.4 V threshold, 300 mV hysteresis).

Key Specifications

Pinout & Package

MP86884DQKT-LF-Z is housed in a thermally enhanced 6 mm × 6 mm TQFN package with exposed thermal pad (pins 1–6 and 8–21). Pin numbering follows JEDEC MO-220 standard; pin 1 is marked by index area on top view. The package supports ≤260 °C reflow and is RoHS6 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP86884DQKT-LF-Z, MP86956 offers +5 A headroom and integrated bootstrap diode at slight cost premium, while ISL99390 trades compactness for wider input range and higher voltage robustness - both require revalidation of CS/VTEMP interface timing and thermal layout.

Availability

MP86884DQKT-LF-Z is available at Aetrix Electronics and suitable for server core voltage regulation, GPU power delivery, and AI accelerator power modules requiring stable component supply across extended production lifecycles.

Supply support for MP86884DQKT-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 mixed-signal ICs for power management, motion control, and automotive applications.

The MP86884 belongs to MPS's Intelli-Phase™ family of integrated power stages, designed specifically for high-current, high-frequency multi-phase buck converters in data center and AI infrastructure.

FAQ

What is the maximum allowable junction temperature for MP86884DQKT-LF-Z?

The absolute maximum junction temperature is 150°C, with recommended continuous operation limited to 125°C. Thermal design must ensure θJA ≤ 29°C/W on a 4-layer PCB per JESD51-7; exceeding 125°C triggers thermal shutdown via internal protection circuitry linked to the VTEMP pin output.

Can MP86884DQKT-LF-Z operate without an external bootstrap capacitor?

No - the BST pin requires a 0.22 µF to 1 µF ceramic capacitor connected between BST and SW to generate the floating supply for the high-side gate driver. Omitting this capacitor prevents HS FET turn-on and causes immediate functional failure; minimum capacitance is strictly 100 nF per layout guidelines.

How does the current sense (CS) pin interface with a multi-phase controller?

The CS pin sources 10 µA per 1 A of low-side FET current. In multi-phase systems, CS outputs from all MP86884 units are summed through matched resistors into a single current sense amplifier input, enabling real-time phase current balancing and cycle-by-cycle overcurrent protection without additional signal conditioning.

Is the EN pin necessary for normal operation?

Yes - EN must be pulled high (≥2 V) to enable switching. Pulling EN low forces the SW node into high-impedance state regardless of PWM state, providing hardware-level safety during startup, fault recovery, or system reset. It is not optional for reliable sequencing in VRMs.

What is the function of the DT pin, and should it be left floating?

The DT pin adjusts dead time between HS and LS FET switching. Per datasheet, it is recommended to leave DT floating to use the default 3 ns (rising) / 8 ns (falling) setting. Driving DT externally is only required when optimizing for specific FETs or frequencies outside typical 600 kHz operation.

Does MP86884DQKT-LF-Z support automatic phase shedding?

No - automatic phase shedding is controlled by the external multi-phase controller (e.g., MP2935), not the MP86884 itself. The MP86884 responds to tri-state PWM commands and EN signals from the controller to enter high-Z state, but does not autonomously shed phases based on load conditions.

How is temperature sensing calibrated using the VTEMP pin?

VTEMP outputs voltage = (Junction Temperature × 10 mV/°C) − 100 mV. At 80°C, output is 700 mV. Calibration requires measuring VTEMP relative to VSS (not PGND) with a precision ADC; offset error is factory-trimmed, and no user calibration is needed for ±2°C accuracy across −40°C to +125°C.