Monolithic Power Systems Inc. MP86884DQKT-Z

Overview

MP86884DQKT-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, features integrated current and temperature sensing, and operates from 4.5 V to 14 V input - optimized for server core voltage regulation.

For engineers reviewing the MP86884DQKT-Z datasheet, MP86884DQKT-Z pinout, MP86884DQKT-Z application, or MP86884DQKT-Z equivalent, key selection criteria include tri-state PWM compatibility, 55 A phase-current capability, dead-time control (3 ns rising / 8 ns falling), bootstrap-enabled high-side drive, and multi-phase current/temperature sense interface support.

Technical Context

The MP86884 functions as a self-contained half-bridge power stage with integrated driver logic, HS/LS FETs, and analog sensing circuitry. Its tri-state PWM input enables seamless integration with multi-phase VR controllers (e.g., MP2935), while internal dead-time control prevents shoot-through and optimizes efficiency across 100 kHz–1 MHz operation.

Current sensing is implemented via a 10 µA/A proportional current source on the CS pin, supporting cycle-by-cycle overcurrent protection and phase balancing. Temperature sensing uses the VTEMP pin with 10 mV/°C gain and −100 mV offset, enabling real-time junction monitoring and system-level thermal management in multi-phase configurations.

Key Specifications

Pinout & Package

MP86884DQKT-Z is housed in a thermally enhanced 6 mm × 6 mm TQFN package with exposed thermal pad (pins 1–6, 8–21, 22–23). The package supports high-current routing and efficient heat dissipation via PCB copper planes and vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP86884DQKT-Z, MP86957DQKT-Z offers higher current headroom in identical form factor, while ISL99390HRZ-T trades sensing integration and thermal capability for smaller footprint - making MP86884 the optimal balance of current, sensing, and thermal performance for mainstream server VRMs.

Availability

MP86884DQKT-Z is available at Aetrix Electronics and suitable for server core voltage regulation, GPU power delivery, and AI accelerator voltage rails requiring stable component supply, long-term lifecycle assurance, and RoHS6-compliant packaging.

Supply support for MP86884DQKT-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 - engineered specifically for high-efficiency, high-density multi-phase VRMs in datacenter and AI infrastructure, where integration, thermal performance, and sensing fidelity are critical.

FAQ

What is the maximum allowable continuous output current for MP86884DQKT-Z?

The MP86884DQKT-Z is rated for 55 A continuous output current under specified thermal conditions (TA = +25°C, θJA = 29 °C/W). This rating assumes proper PCB layout with adequate copper area, thermal vias, and input/output capacitance. Derating is required above +25°C ambient or with reduced airflow.

Does MP86884DQKT-Z support diode emulation mode, and how is it enabled?

Yes - diode emulation mode is enabled by pulling the SYNC pin low. In this mode, the low-side FET turns off when inductor current crosses zero, reducing reverse conduction losses during light-load conditions. The feature is fully integrated and requires no external components beyond the SYNC pull-down resistor.

How is current sensing implemented, and what external components are needed?

Current sensing uses a 10 µA/A proportional current source on the CS pin. A single resistor (R_CS) from CS to ground converts current to voltage (e.g., 100 mΩ yields 1 V/A). No op-amp is required. A small capacitor (≤100 pF) may be added for noise filtering, but is optional per the datasheet.

What is the function of the DT (Dead Time) pin, and should it be configured?

The DT pin adjusts internal dead-time duration. By default, it is recommended to leave DT floating to use the factory-trimmed values (3 ns rising / 8 ns falling). External configuration is only needed for specialized timing tuning and requires careful validation to avoid shoot-through or excessive dead time.

Can MP86884DQKT-Z be used in single-phase applications, or is it limited to multi-phase?

MP86884DQKT-Z is fully functional in single-phase buck converters and supports standalone operation. However, its tri-state PWM interface, current/temperature sense outputs, and thermal design are optimized for multi-phase coordination - especially with controllers like MP2935 - where benefits in phase balancing and thermal mapping are maximized.

What is the recommended bootstrap capacitor value and placement for MP86884DQKT-Z?

A 0.22 µF to 1 µF ceramic capacitor is recommended between BST and SW pins. It must be placed within 2 mm of the BST pin with short, wide traces. Capacitance below 100 nF is prohibited. A 3.3 Ω series resistor between BST and the capacitor improves stability but is not mandatory per datasheet guidelines.

Is MP86884DQKT-Z pin-compatible with earlier revisions like MP86884DQKT?

Yes - MP86884DQKT-Z is the tape-and-reel variant of MP86884DQKT and shares identical pinout, electrical characteristics, and thermal behavior. The "-Z" suffix denotes packaging format only; no functional or mechanical differences exist between the two orderables.