Monolithic Power Systems Inc. MP86934GLT-P

Overview

MP86934GLT-P from Monolithic Power Systems is a monolithic half-bridge Intelli-Phase solution integrating high- and low-side MOSFETs, gate drivers, current sense, and temperature sense in a single FC-TQFN-21 (3mm × 4mm) package. It delivers 25A continuous output current, operates from 4.5V–16V input, supports 100kHz–2MHz switching, and is compliant with Intel DrMOS V4.0 for server VR applications.

For engineers reviewing the MP86934GLT-P datasheet, MP86934GLT-P pinout, MP86934GLT-P application, or MP86934GLT-P equivalent, key selection criteria include tri-state PWM compatibility, integrated fault reporting (OC/OT), ±15A bidirectional current limit, 10mV/°C temperature sensing accuracy, and thermal resistance θJB = 2.2°C/W for high-density multi-phase buck regulator designs.

Technical Context

The MP86934GLT-P implements a synchronous half-bridge topology with adaptive dead-time control (3ns rising / 8ns falling for positive current), bootstrap gate drive, and diode emulation mode enabled via SYNC or tri-state PWM. Its internal current sense (10μA/A gain, ±3% accuracy) and temperature sense (10mV/°C, −100mV offset at 25°C) feed real-time feedback to external controllers.

It features dual fault latching: high-side overcurrent (60A limit, 4-cycle latch), overtemperature shutdown (160°C threshold, 20°C hysteresis), and SW-to-PGND short detection - all reported on the shared VTEMP/FLT pin pulled to 3.3V during fault. Standby mode disables CS and VTEMP/FLT outputs after 2μs of floating/mid-voltage SYNC.

Key Specifications

Pinout & Package

MP86934GLT-P uses an FC-TQFN-21 (3mm × 4mm) package with exposed thermal pad. Pin 1 is marked by index area; recommended land pattern includes full thermal pad soldering and ≥8 vias to inner ground planes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL99390HRZ-T and TPS53679RSMT, MP86934GLT-P offers optimal balance of current density (25A in 3×4mm), tri-state PWM compatibility for analog/digital hybrid controllers, and unified VTEMP/FLT reporting - making it ideal for cost-sensitive, space-constrained VR14-compliant designs without digital management overhead.

Availability

MP86934GLT-P is available at Aetrix Electronics and suitable for server CPU core regulators, AI accelerator VRMs, and telecom baseband power supplies requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for MP86934GLT-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 MP86934 belongs to MPS's Intelli-Phase™ DrMOS product line, engineered specifically for high-efficiency, high-density multi-phase buck regulators in datacenter and AI infrastructure where thermal performance, fault resilience, and layout simplicity are critical.

FAQ

What is the purpose of the tri-state PWM input on MP86934GLT-P?

The tri-state PWM input enables diode emulation mode without external circuitry: when PWM is floated or held at 1.3–1.7V for ≥50ns, the high-side FET turns off and low-side FET conducts until zero-current detection. This reduces light-load losses in CCM/DCM boundary operation and is essential for VR14 compliance in server VRMs.

How does the VTEMP/FLT pin function during normal operation versus fault conditions?

During normal operation, VTEMP/FLT outputs a voltage proportional to junction temperature (0.15V at 25°C, +10mV/°C). During any fault (overcurrent, overtemperature, or SW–PGND short), it hard-pulls to 3.3V regardless of temperature - providing unambiguous, latchable fault signaling to the system controller using a single GPIO.

What is the minimum recommended bootstrap capacitor value for MP86934GLT-P?

MPS specifies a 0.1μF to 1μF ceramic capacitor between BST and SW pins. For 25A continuous operation at 2MHz, a 0.22μF X7R 0402 capacitor placed directly adjacent to pins 21 and 2–4 is recommended to maintain >3V gate drive margin under worst-case dV/dt and minimize bootstrap droop.

Can MP86934GLT-P be used in single-phase applications?

Yes - MP86934GLT-P is commonly deployed in single-phase high-current applications such as GPU core supplies or FPGA auxiliary rails. Its 25A rating, integrated current sense, and thermal performance make it viable for up to 30A peak loads with appropriate PCB copper and airflow, though multi-phase use maximizes its efficiency advantages.

What is the significance of θJB = 2.2°C/W in thermal design?

θJB = 2.2°C/W means that with 1W of power dissipation, the junction-to-board temperature rise is only 2.2°C - enabling >20W total loss handling on standard FR4 with 2oz copper and 8+ thermal vias. This eliminates need for thermal pads or heatsinks in most 1U server applications, simplifying mechanical integration.

Does MP86934GLT-P require external current-sense resistors?

No - MP86934GLT-P integrates a bi-directional current-sense amplifier with 10μA/A gain. An external resistor (RCS) is required only to convert the CS pin's current output into a measurable voltage (e.g., 10kΩ for 100mV/A), but no shunt resistor is needed in the power path, preserving efficiency and reducing board space.