Monolithic Power Systems Inc. MP86934GLT-Z

Overview

MP86934GLT-Z 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 to 16V input, supports 100kHz–2MHz switching, and accepts tri-state PWM for multi-phase buck regulators in server VRMs.

For engineers reviewing the MP86934GLT-Z datasheet, MP86934GLT-Z pinout, MP86934GLT-Z application, or MP86934GLT-Z equivalent, key selection criteria include its DrMOS V4.0 compliance, integrated fault reporting (OC/OT), dual-function VTEMP/FLT pin, and bootstrap-enabled high-side drive architecture optimized for high-density power delivery.

Technical Context

The MP86934GLT-Z implements a synchronous half-bridge topology with adaptive dead-time control (3ns rising / 8ns falling for positive current), internal bootstrap switch, and diode emulation mode triggered via SYNC or tri-state PWM. Its gate driver operates from a dedicated 3.0–3.6V VCC rail independent of VIN.

It integrates analog sensing functions: bi-directional current sense (10μA/A gain, ±3% accuracy over 5–30A), junction temperature monitoring (10mV/°C, −100mV offset at 25°C), and combined fault reporting on VTEMP/FLT-pulling to 3.3V upon overcurrent (4-cycle latch), overtemperature (>160°C), or SW-to-PGND short.

Key Specifications

Pinout & Package

MP86934GLT-Z is housed in a 21-pin FC-TQFN package (3mm × 4mm, 0.5mm pitch) with exposed thermal pad for enhanced power dissipation. The package complies with JEDEC MO-220 and features coplanarity ≤0.10mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IR35201MTRPBF and TPS53679RSLR, the MP86934GLT-Z uniquely balances 25A capability, 3×4mm size, analog thermal/current sensing, and DrMOS V4.0 compliance-making it optimal for space-constrained, thermally aware analog-controlled VRMs where digital overhead is unnecessary.

Availability

MP86934GLT-Z is available at Aetrix Electronics and suitable for server core VRMs, telecom baseband processor supplies, and graphics card memory rails requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for MP86934GLT-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 power ICs, with design centers across Asia and North America.

The MP86934 belongs to MPS's Intelli-Phase™ DrMOS product line, engineered specifically for high-efficiency, high-density multi-phase buck converters in datacenter and networking infrastructure where thermal performance and analog signal integrity are critical.

FAQ

What is the function of the VTEMP/FLT pin?

The VTEMP/FLT pin serves dual roles: as an analog temperature sensor output (10mV/°C, −100mV offset at 25°C) during normal operation, and as an open-drain fault indicator that pulls to 3.3V upon overcurrent, overtemperature (>160°C), or SW-to-PGND short. Fault state overrides temperature reporting to ensure unambiguous system-level fault detection.

How does the MP86934GLT-Z support diode emulation mode?

Diode emulation is enabled by pulling SYNC low, driving PWM to mid-voltage (1.3–1.7V), or floating PWM. In this mode, the low-side FET turns on during positive inductor current and turns off at zero-crossing-reducing light-load switching losses without requiring controller-level DCM support.

What is the recommended bootstrap capacitor value and placement?

A 0.1µF to 1µF ceramic capacitor is recommended between BST and SW pins. It must be placed adjacent to the device with short, wide traces (≥20 mils) to minimize loop inductance. This ensures reliable high-side gate drive above VIN during switching transitions.

Can the MP86934GLT-Z operate without an external current sense resistor?

No-the CS pin outputs a bi-directional current (10μA/A) that requires an external resistor (R_CS) tied to a stable reference voltage (e.g., VCC-derived divider) to generate a measurable voltage. Equation 1 in the datasheet defines R_CS sizing to maintain CS voltage within 0.8–2.0V for accurate sensing up to ±25A.

What thermal management practices are critical for 25A operation?

Effective thermal management requires: (1) soldering the exposed thermal pad to a solid inner-layer ground plane using ≥9 thermal vias (0.2mm diameter), (2) minimizing θJB via wide PGND copper pours, and (3) ensuring θJB = 2.2°C/W is achieved in layout-verified by thermal simulation or IR imaging under 25A DC load at 12V_IN.

Is the MP86934GLT-Z RoHS and halogen-free compliant?

Yes-MP86934GLT-Z is lead-free, halogen-free, and fully compliant with the EU RoHS directive. MPS confirms green status per its Quality Assurance documentation, with material declarations available upon request for full supply chain traceability.

How is the overcurrent protection implemented and reset?

Overcurrent protection triggers after four consecutive high-side current limit events (60A threshold), latching the HSFET OFF and pulling VTEMP/FLT to 3.3V. The latch is cleared only by cycling VIN or VCC power-standby mode does not reset the fault, ensuring persistent fault visibility for system diagnostics.