Texas Instruments LMG3622REQR

Overview

LMG3622REQR from Texas Instruments is a 700V, 106mΩ gallium nitride (GaN) power FET with integrated gate driver, current-sense emulation, cycle-by-cycle overcurrent protection, and overtemperature reporting via open-drain FLT pin. It operates in hard-switched CCM, ZVS, and DCM topologies for high-frequency AC/DC converters, delivering 7.7A continuous drain current with 23ns turn-on delay (fastest slew setting) and 240μA quiescent current at 25°C.

For engineers reviewing the LMG3622REQR datasheet, LMG3622REQR pinout, LMG3622REQR application, or LMG3622REQR equivalent, key selection considerations include its programmable turn-on slew rate (four discrete settings), 8mm × 5.3mm 38-pin VQFN thermal-pad package, integrated current-sense emulation gain of 0.691mA/A, UVLO threshold of 9.3V (typ), and RθJC(bot) of 1.31°C/W for high-power-density designs.

Technical Context

The LMG3622REQR integrates a GaN FET, driver, and analog current-sense emulation block in a single die. Its driver features low propagation delay (23–107ns turn-on delay depending on RDRV setting), adjustable slew rate via external resistor (0–125 V/ns), and high CMTI due to minimized common-source inductance.

Current-sense emulation replaces the lossy external shunt by sourcing a scaled replica (0.691mA/A) of drain current from the CS pin, enabling direct thermal-pad grounding to PGND. Protection includes cycle-by-cycle current limit (8.5A typ), overtemperature shutdown (155°C typ), and under-voltage lockout (9.3V typ).

Key Specifications

Pinout & Package

LMG3622REQR uses an 8mm × 5.3mm 38-pin VQFN package (REQ) with exposed thermal pad (PAD) internally connected to S, AGND, and NC2 pins. The package supports high-current routing and low-inductance thermal path to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMG3622R035, the LMG3622REQR offers smaller footprint and lower quiescent current at the cost of higher R_DS(on); versus GS66508T, it trades discrete flexibility for faster time-to-market via integrated driver and current-sense emulation - reducing component count by ≥4 and eliminating shunt-related power loss.

Availability

LMG3622REQR is available at Aetrix Electronics and suitable for USB-C wall chargers, TV auxiliary power supplies, mobile fast charging adapters, and LED driver power supplies requiring stable component supply, long-term lifecycle support, and traceable GaN sourcing.

Supply support for LMG3622REQR 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs for industrial, automotive, and consumer markets.

The LMG3622REQR belongs to TI's GaN power stage product line, designed specifically to simplify high-efficiency, high-frequency SMPS design by integrating GaN FET, driver, protection, and current-sense functions into a thermally optimized QFN package.

FAQ

What is the maximum recommended drain-source voltage for continuous operation of the LMG3622REQR?

The LMG3622REQR is rated for 700V V_DS under normal continuous-conduction mode (CCM) operation with a 520V plateau voltage. During ZVS/DCM operation, the plateau voltage may reach 560V, and transient ringing is limited to 700V. For surge conditions, V_DS(surge) is 720V and V_{DS(tr)(surge)} is 800V - these are not for continuous use. Always refer to the absolute maximum ratings table in the LMG3622REQR datasheet for safe operating area boundaries.

How does the current-sense emulation function of the LMG3622REQR replace an external shunt resistor?

The LMG3622REQR's CS pin sources a current proportional to drain current (0.691mA per 1A) that flows through an external resistor (e.g., 100Ω) to AGND, generating a voltage signal identical to what a shunt would produce. This eliminates the power loss and board space of a discrete shunt, and allows the thermal pad to connect directly to power ground - improving thermal performance and simplifying layout. The LMG3622REQR also clamps CS to 2.55V to protect controller inputs if the resistor becomes disconnected.

Can the LMG3622REQR be used in both high-side and low-side switching configurations?

The LMG3622REQR is optimized for low-side switching in buck, flyback, and active-clamp topologies, with its source (S) pins and thermal pad internally tied to AGND. While it can be used in high-side configurations, doing so requires level-shifting the IN and EN signals and careful isolation of AGND from power ground - which negates the benefit of integrated current-sense emulation. TI recommends using the LMG3622REQR in low-side roles where its integrated features deliver maximum value.

What is the purpose of the RDRV pin on the LMG3622REQR, and how is it configured?

The RDRV pin on the LMG3622REQR sets the GaN FET's turn-on slew rate by connecting an external resistor to AGND. Four discrete settings (0–3) correspond to typical slew rates of 17, 42, 65, and 125 V/ns. Setting 0 uses an open circuit (120kΩ), while setting 3 uses a short (0Ω). The setting is latched at AUX power-up and remains fixed until next power cycle. This feature enables EMI optimization without changing gate resistance or layout.

Does the LMG3622REQR support burst-mode operation, and how is light-load efficiency achieved?

Yes, the LMG3622REQR supports burst-mode operation via its EN pin, which toggles between active mode (240μA quiescent current) and standby mode (50μA). Combined with low AUX UVLO hysteresis (250mV) and fast wake-up time (1.5μs), this enables compliant light-load efficiency in standards like DoE Level VI and CoC Tier 2. The LMG3622REQR's low standby IQ directly reduces no-load power consumption in AC/DC adapters and auxiliary supplies.