Texas Instruments LMG3411R050RWHT

Overview

LMG3411R050 from Texas Instruments is a 600-V, 50-mΩ integrated GaN power stage with cycle-by-cycle overcurrent protection, direct-drive gate architecture, and internal buck-boost converter for –14-V turn-off bias. It delivers 34-A continuous drain current at 25°C, supports >100 V/ns slew rates, and enables high-density totem-pole PFC and industrial motor drives.

For engineers reviewing the LMG3411R050 datasheet, LMG3411R050 pinout, LMG3411R050 application, or LMG3411R050 equivalent, key selection criteria include its adjustable slew rate (25–100 V/ns), 20-ns propagation delay, integrated fault reporting via push-pull FAULT pin, and compatibility with unregulated +12-V supply only - eliminating external gate bias rails.

Technical Context

The LMG3411R050 implements a Direct-Drive GaN architecture using an internal silicon series FET and buck-boost converter to generate –14-V VNEG for reliable GaN turn-off, eliminating cascode complexity and common-source inductance. Its gate driver is trimmed for threshold variation compensation and operates with zero reverse recovery charge (Qrr = 0 nC).

Protection is hardware-based and fully integrated: cycle-by-cycle OCP triggers within 35 ns after blanking (55 ns), OTP trips at 165°C with 25°C hysteresis, and UVLO on VDD (9.1 V turn-on, 8.5 V turn-off) ensures robust startup. The device sustains 720-V surge and 150 V/ns dv/dt immunity without external components.

Key Specifications

Pinout & Package

LMG3411R050 uses an 8.00 mm × 8.00 mm QFN-32 package (RWH) with exposed thermal pad. The package integrates power, control, and protection functions in a single surface-mount unit optimized for low-inductance high-voltage layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar GaN power stage applications.

Compared with LMG3410R050, LMG3411R050 provides automatic fault recovery per PWM cycle - critical for motor drives with peak torque surges. Against GS66508T, it eliminates 7 external components (bias supply, OCP comparator, isolator, etc.), reducing PCB area by 35% and improving reliability via monolithic integration.

Availability

LMG3411R050 is available at Aetrix Electronics and suitable for high-density industrial and consumer power supplies, solar inverters, and uninterruptible power supplies requiring stable component supply across multi-year production cycles.

Supply support for LMG3411R050 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management ICs, with decades of automotive and industrial qualification expertise.

The LMG341xR050 product line was designed to replace silicon MOSFETs and cascode GaN solutions in high-frequency, high-efficiency power conversion - targeting 1–10 kW systems where size, efficiency, and reliability are paramount.

FAQ

What distinguishes LMG3411R050 from LMG3410R050?

The LMG3411R050 implements cycle-by-cycle overcurrent protection, allowing automatic fault recovery each PWM cycle, whereas the LMG3410R050 uses latched OCP requiring manual reset. All other electrical specs, pinout, package, and thermal performance are identical between the two parts. This makes LMG3411R050 ideal for applications like motor drives where transient overloads must not interrupt operation.

Does LMG3411R050 require an external negative gate bias supply?

No. The LMG3411R050 integrates a buck-boost DC-DC converter that generates –14 V (VNEG) internally. This eliminates the need for external isolated negative bias supplies, simplifying layout and reducing BOM count. Only a 2.2-µF capacitor from VNEG to SOURCE is required for stability.

How is slew rate adjusted on LMG3411R050?

Slew rate is set by connecting a resistor from the RDRV pin (Pin 30) to SOURCE. Values of 15 kΩ, 45 kΩ, and 150 kΩ yield typical slew rates of 100 V/ns, 50 V/ns, and 25 V/ns respectively. This resistor selection directly controls turn-on edge speed without altering gate drive voltage or requiring firmware changes.

Can LMG3411R050 operate with only a +12-V supply?

Yes. The LMG3411R050 is designed to operate from a single unregulated +12-V supply on VDD (Pin 27). Its internal LDO generates 5 V for external isolators, and the buck-boost converter derives –14 V for GaN turn-off - no additional power rails are needed for basic operation.

What is the role of the FAULT pin on LMG3411R050?

The FAULT pin (Pin 32) is a push-pull active-low output that asserts during overcurrent, overtemperature, or UVLO events. In LMG3411R050, it clears automatically at the end of each PWM cycle when OCP triggers - enabling cycle-by-cycle current limiting. This behavior differs from latched alternatives and allows real-time fault monitoring without system interruption.