Texas Instruments LMG3422R050RQZR

Overview

LMG3422R050 from Texas Instruments is a 600V, 50mΩ GaN FET with integrated gate driver, cycle-by-cycle overcurrent protection (<100ns response), 20–150V/ns adjustable slew rate, and digital temperature PWM output - designed for high-density hard-switching power converters such as server PSUs and telecom rectifiers.

For engineers reviewing the LMG3422R050 datasheet, LMG3422R050 pinout, LMG3422R050 application, or LMG3422R050 equivalent, this device delivers verified 720V surge withstand capability, JEDEC JEP180 qualification for hard-switching topologies, and precise thermal feedback via 9kHz duty-cycle-encoded TEMP pin - critical for EMI-optimized, thermally robust high-frequency designs.

Technical Context

The LMG3422R050 integrates a silicon-based gate driver with programmable drive strength (via RDRV pin), enabling precise control of turn-on slew rate from 20V/ns to 150V/ns without external components. Its depletion-mode GaN FET operates with internal buck-boost converter (VNEG/BBSW) and 5V LDO (LDO5V) for isolated gate bias generation.

It implements real-time fault detection including overcurrent (40–60A threshold), short-circuit (60–90A), overtemperature (175°C GaN junction), and VDD/VNEG UVLO - all with sub-150ns fault-to-turnoff latency. Unlike LMG3426R050/LMG3427R050, it lacks ZVD or ZCD features, making it optimized for standard hard-switching rather than soft-switching topologies.

Key Specifications

Pinout & Package

LMG3422R050 uses the RQZ (54-pin VQFN) package, 12.00mm × 12.00mm, with exposed thermal pad internally connected to SOURCE, GND, and NC2 pins. The package supports high-current routing and low-inductance layout for GaN switching integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMG3426R050, LMG3422R050 removes ZVD functionality to reduce pin count and simplify control interface - ideal for fixed-frequency hard-switching where ZVS is not implemented. Versus GAN063-650WSB, LMG3422R050 integrates driver, protection, and thermal telemetry, cutting bill-of-materials by 7 components and eliminating 3x layout risk points.

Availability

LMG3422R050 is available at Aetrix Electronics and suitable for server PSU primary switches, telecom rectifier high-side switches, solar inverter DC-link stages, and industrial motor drive half-bridges requiring stable component supply, JEDEC-qualified reliability, and GaN-specific thermal management support.

Supply support for LMG3422R050 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 focused on analog, embedded processing, and power management technologies - serving industrial, automotive, and communications markets with high-reliability, application-optimized solutions.

The LMG342xR050 product line was developed to replace silicon MOSFETs in high-frequency, high-efficiency power conversion - delivering integrated GaN switching with driver, protection, and telemetry in a single low-inductance package for next-generation SMPS designs.

FAQ

What is the maximum continuous drain current rating for LMG3422R050?

The LMG3422R050 is rated for 44A RMS drain current under recommended operating conditions. This value assumes proper PCB thermal design with the exposed thermal pad soldered to a multi-layer copper plane. At 125°C junction temperature, R_DS(on) rises to 73mΩ, increasing conduction loss - thermal modeling must verify sustained operation at full RMS current.

Does LMG3422R050 support zero-voltage switching (ZVS) or zero-current switching (ZCS)?

The LMG3422R050 does not include ZVD or ZCD functionality - those features are exclusive to LMG3426R050 (ZVD) and LMG3427R050 (ZCD). While the LMG3422R050 can operate in ZVS circuits, it provides no dedicated detection or timing signals to assist with adaptive dead-time control or soft-switching optimization.

How is the temperature of LMG3422R050 reported, and what is its accuracy?

The LMG3422R050 reports junction temperature via a 9kHz PWM output on the TEMP pin, where duty cycle linearly encodes temperature from 0.3% at 25°C to 82% at 150°C. Accuracy is ±5°C across the full range, calibrated at wafer test - no external calibration or lookup table is required for basic thermal monitoring.

What protection features are built into LMG3422R050?

The LMG3422R050 integrates cycle-by-cycle overcurrent protection (40–60A threshold), latched short-circuit protection (60–90A), GaN junction overtemperature shutdown (175°C), VDD UVLO (6.1–7.5V window), and VNEG UVLO (–13.6 to –12.1V). All protections trigger FAULT pin assertion and disable the FET within ≤145ns.

Can LMG3422R050 be used with a 5V logic controller without level shifting?

Yes - the IN pin accepts CMOS-compatible inputs with 1.7–2.45V positive-going threshold and 0.7–1.3V negative-going threshold, making it directly compatible with 3.3V and 5V microcontrollers. No external level shifter is required, and the 100–200kΩ internal pulldown ensures defined state during startup or reset.