Texas Instruments LMG3411R050RWHR

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 negative turn-off bias. It delivers 20 ns propagation delay, 25–100 V/ns user-adjustable slew rate, and operates in high-density totem-pole PFC and industrial motor drives.

For engineers reviewing the LMG3411R050 datasheet, LMG3411R050 pinout, LMG3411R050 application, or LMG3411R050 equivalent, key selection considerations include its 32-pin QFN package, cycle-by-cycle OCP behavior (vs. latched OCP in LMG3410R050), RDRV-based slew control, fault status signaling, and integrated -14 V VNEG rail generation.

Technical Context

The LMG3411R050 implements a Direct-Drive GaN architecture using an internal silicon series FET and buck-boost converter to generate VNEG (–14 V) for reliable GaN turn-off-eliminating external negative bias supplies. Its gate driver is trimmed for threshold variation compensation and immune to >150 V/ns drain dv/dt.

It integrates three critical supply rails: 12-V VDD input, 5-V LDO5V output for isolators, and regulated VNEG for gate control. Protection includes <100 ns overcurrent response, UVLO on all supplies, and thermal shutdown at 165 °C with 25 °C hysteresis-enabling self-protected operation without external components.

Key Specifications

Pinout & Package

LMG3411R050 is housed in an 8.0 mm × 8.0 mm, 32-pin QFN package (RWH) with exposed thermal pad. The package supports high-current routing and low-inductance layout for GaN switching performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMG3410R050, LMG3411R050 offers automatic fault recovery per PWM cycle-ideal for dynamic loads-while GS66508T demands full external support circuitry, increasing bill-of-materials and validation effort despite higher voltage margin.

Availability

LMG3411R050 is available at Aetrix Electronics and suitable for high-density industrial motor drives, solar inverters, uninterruptible power supplies, and high-voltage battery chargers requiring stable component supply and long-term production continuity.

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 reliability validation in automotive, industrial, and computing markets.

The LMG341x family was designed specifically for high-frequency, high-efficiency power conversion-targeting totem-pole PFC, server PSUs, and renewable energy inverters where GaN's zero reverse recovery and low capacitance deliver measurable system-level gains.

FAQ

What distinguishes LMG3411R050 from LMG3410R050?

The core distinction is overcurrent protection behavior: LMG3411R050 implements cycle-by-cycle current limiting, allowing automatic recovery each PWM cycle after fault clearance, whereas LMG3410R050 uses latched OCP requiring IN pin hold-low or VDD power cycle. All other specifications-including pinout, R_DS(on), V_DS, and thermal metrics-are identical for both LMG3411R050 and LMG3410R050.

How does the RDRV pin adjust slew rate in LMG3411R050?

The RDRV pin on LMG3411R050 accepts an external resistor to ground that sets the gate drive strength: 15 kΩ yields ~100 V/ns, 45 kΩ yields ~50 V/ns, and 150 kΩ yields ~25 V/ns. This resistor directly controls turn-on dv/dt without altering gate loop inductance or requiring external gate resistors-enabling EMI optimization while preserving fast turn-off characteristics.

Does LMG3411R050 require an external negative voltage supply?

No, LMG3411R050 does not require an external negative voltage supply. It integrates a buck-boost DC-DC converter that generates a regulated –14 V VNEG rail internally from the 12 V VDD input. Users connect an external inductor between BBSW and SOURCE and a 2.2 µF capacitor from VNEG to SOURCE to complete the bias supply.

What is the role of the FAULT pin on LMG3411R050?

The FAULT pin on LMG3411R050 is a push-pull, active-low digital output signaling overcurrent, overtemperature, or UVLO faults. Unlike latched versions, it clears automatically when the IN input goes low-enabling cycle-by-cycle recovery. It interfaces directly with MCU GPIOs and requires no external pull-up resistor due to its internal active drive.

Can LMG3411R050 operate without the LDO5V output connected?

Yes, LMG3411R050 can operate without loading the LDO5V output. The 5 V LDO is optional and intended solely to power external digital isolators or level shifters. If unused, the LDO5V pin should be left floating or bypassed with a 1 µF capacitor to SOURCE for stability-no load is required for core GaN switching functionality.