Monolithic Power Systems Inc. MP86884DQKT-LF-P

Overview

MP86884DQKT-LF-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 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 across 4.5 V–14 V input range-designed for server core voltage regulation.

For engineers reviewing the MP86884DQKT-LF-P datasheet, MP86884DQKT-LF-P pinout, MP86884DQKT-LF-P application, or MP86884DQKT-LF-P equivalent, key selection criteria include tri-state PWM compatibility, 55 A phase-current capability, bootstrap-based high-side drive, ±4% current sense accuracy at 30 A, and diode emulation mode via SYNC pin control.

Technical Context

The MP86884 functions as a self-contained half-bridge power stage with integrated driver logic, dead-time control (3 ns rising / 8 ns falling), and cycle-by-cycle current limiting (HS: 80 A, LS: –30 A). Its tri-state PWM interface enables seamless coordination with multi-phase VR controllers like MP2935.

Current sensing is implemented via a 10 µA/A proportional current source on the CS pin, while junction temperature is monitored through the VTEMP pin (10 mV/°C with –100 mV offset). The device enters high-impedance state when PWM floats or is driven to mid-voltage (1.45–3.20 V), and supports diode emulation when SYNC is pulled low.

Key Specifications

Pinout & Package

MP86884DQKT-LF-P uses a 34-pin 6×6 mm TQFN package with exposed thermal pad (pins 1–6 and 8–21 connected to SW and PGND respectively). Pin numbering follows JEDEC MO-220 standard; top marking "MP86884" confirms revision and lot traceability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP86884DQKT-LF-P, MP86957 offers higher current headroom but reduced frequency flexibility, while ISL99390 provides integrated signal conditioning at the cost of layout incompatibility and increased BOM count for decoupling.

Availability

MP86884DQKT-LF-P is available at Aetrix Electronics and suitable for server core voltage regulation, GPU core regulators, and modular power supply units requiring stable component supply, RoHS6-compliant packaging, and production-ready thermal performance.

Supply support for MP86884DQKT-LF-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 analog and power ICs, with design centers in the US, China, and Taiwan, and manufacturing partners across Asia.

The MP86884 belongs to MPS's Intelli-Phase™ family-engineered specifically for high-density, multi-phase DC/DC conversion in datacenter and AI hardware, emphasizing integration, thermal intelligence, and controller interoperability.

FAQ

What is the recommended bootstrap capacitor value for MP86884DQKT-LF-P?

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 within 2 mm of the BST pin is optimal for minimizing ringing and ensuring reliable high-side gate drive across 100 kHz–1 MHz operation.

How does the MP86884 handle overcurrent events on the low-side FET?

When the LSFET current reaches –30 A (absolute value), the device immediately disables the LSFET for that switching cycle while maintaining HS operation. This cycle-by-cycle clamping prevents inductor saturation and maintains regulator stability without latching off the entire stage.

Can MP86884DQKT-LF-P operate without an external controller?

No-it requires an external PWM or multi-phase VR controller (e.g., MP2935, IR352xx) to drive the PWM and SYNC pins. The device contains no internal PWM generator or feedback loop; it functions solely as a controlled power stage with sensing and protection.

What is the purpose of the DT pin, and should it be connected?

The DT pin sets non-default dead time; the datasheet recommends leaving it floating to use the factory-trimmed values (3 ns rising / 8 ns falling). Connecting external resistance alters timing and may increase shoot-through risk unless validated with waveform analysis.

How is junction temperature calculated from the VTEMP pin voltage?

VTEMP = (T_J × 10 mV/°C) – 100 mV. To obtain T_J, measure voltage between VTEMP and VSS, then compute T_J = (V_VTEMP + 100 mV) / 10 mV/°C. For example, 700 mV reading corresponds to 80°C junction temperature.

Is the EN pin edge-sensitive or level-sensitive?

The EN pin is level-sensitive: pulling it low forces SW into high-impedance state regardless of PWM state, and releasing it (to ≥2 V) allows normal operation once VDDDRV and VBST reach valid thresholds. No internal debouncing or pulse detection is implemented.

Does MP86884DQKT-LF-P support phase shedding in multi-phase systems?

Yes-via the EN pin. Each MP86884 can be independently enabled/disabled by its EN signal, allowing dynamic phase shedding under light load. The device's Hi-Z state ensures zero current contribution and minimal body-diode conduction loss during inactive phases.