Monolithic Power Systems Inc. MP86884DQKT-P

Overview

MP86884DQKT-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, operates from 4.5 V–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 core voltage regulation in high-density server VRMs.

For engineers reviewing the MP86884DQKT-P datasheet, MP86884DQKT-P pinout, MP86884DQKT-P application, or MP86884DQKT-P equivalent, key selection criteria include its 55 A continuous current capability, 3 ns/8 ns dead-time control, bootstrap-enabled high-side drive, integrated thermal monitoring via VTEMP, and compatibility with VR12.5 controllers like MP2935 for phase-current balancing and droop control.

Technical Context

The MP86884DQKT-P implements a fully integrated half-bridge topology with matched HS/LS silicon, driver logic, and analog sensing circuitry on a single die. Its tri-state PWM interface enables seamless coordination with multi-phase controllers, while internal dead-time generation (3 ns rising / 8 ns falling) prevents shoot-through without external timing components.

Current sensing is implemented as a proportional 10 µA/A current source referenced to PGND, supporting cycle-by-cycle overcurrent protection and phase-current summation across multiple phases. Temperature sensing uses a calibrated 10 mV/°C slope with –100 mV offset on VTEMP, allowing direct junction temperature readout relative to VSS.

Key Specifications

Pinout & Package

MP86884DQKT-P uses a 34-pin 6×6 mm TQFN package with dual exposed thermal pads (SW and PGND) and optimized layout for high-current switching. The package conforms to JEDEC MO-220 and includes 0.5 mm pitch leads with coplanarity ≤0.10 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP86884DQKT-P, MP86957DQKT-P trades integrated thermal sensing for higher current and frequency headroom, while ISL99227BIRZ-T7A adds digital telemetry at the cost of larger size and external component dependencies - making MP86884 optimal for analog-controlled, space-constrained server VRMs.

Availability

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

Supply support for MP86884DQKT-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 across Asia and North America and global manufacturing partnerships.

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

FAQ

What is the maximum allowable continuous current for MP86884DQKT-P?

The MP86884DQKT-P is rated for 55 A continuous output current under standard thermal conditions (TA = 25°C, θJA = 29°C/W, 4-layer PCB). Derating is required above 85°C ambient or with reduced airflow; full 55 A operation assumes proper PCB copper area, thermal vias, and input/output capacitor placement per MPS layout guidelines.

How does the tri-state PWM interface function in multi-phase operation?

When the PWM pin is floated or driven to 1.45–3.2 V (mid-state), the MP86884DQKT-P places its SW node in high-impedance mode, effectively disabling that phase. This enables dynamic phase shedding controlled by the VR controller, improving light-load efficiency without requiring external MOSFET gate drivers or disable logic.

Can MP86884DQKT-P operate without an external bootstrap diode?

Yes - the MP86884DQKT-P integrates an internal bootstrap switch, eliminating the need for an external bootstrap diode. A 0.22–1 µF ceramic capacitor must be placed between BST and SW pins, and the device automatically manages charge transfer during each switching cycle to sustain high-side gate drive.

What is the purpose of the VTEMP pin and how is it calibrated?

VTEMP provides a voltage output proportional to junction temperature: VTEMP = (T_J × 10 mV/°C) – 100 mV. At 80°C, VTEMP reads 700 mV. Measurement must be taken between VTEMP and VSS pins. This output enables real-time thermal monitoring and per-phase derating without external thermistors or ADCs.

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

Yes - pulling the SYNC pin low activates diode emulation mode, turning off the low-side FET after inductor current crosses zero. This reduces reverse recovery losses in light-load conditions. The feature is controller-independent and requires only a pull-down resistor on SYNC, with no additional timing or configuration needed.

What is the recommended bootstrap capacitor value and placement?

MPS specifies a 0.22–1 µF X7R ceramic capacitor between BST and SW pins, placed as close as possible to the device with minimal trace length. Capacitance below 100 nF is prohibited. A 3.3 Ω series resistor is recommended to damp ringing, and the capacitor must be rated for ≥16 V DC working voltage.

How is current sense accuracy affected by PCB layout and external components?

CS pin accuracy (±4% at 30 A) assumes proper layout: short traces to ground, use of 1% tolerance R_CS, and optional RC filter (e.g., 10 kΩ + 100 pF) for noise immunity. Long CS traces or shared ground paths introduce offset errors; MPS recommends routing CS directly to controller's current-sense amplifier with guard traces.