Texas Instruments LMG3522R030QRQSRQ1

Overview

LMG3522R030QRQSRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified 650V, 30mΩ GaN power FET with integrated gate driver, cycle-by-cycle overcurrent protection (<100 ns response), digital temperature PWM output, and 20–150 V/ns adjustable slew rate. It operates from 7.5–18 V supply and targets high-density automotive on-board chargers and DC/DC converters.

For engineers reviewing the LMG3522R030QRQSRQ1 datasheet, LMG3522R030QRQSRQ1 pinout, LMG3522R030QRQSRQ1 application, or LMG3522R030QRQSRQ1 equivalent, this device delivers verified hard-switching capability up to 720 V surge, 2 MHz switching frequency, and top-side cooled 12 mm × 12 mm VQFN package with separated electrical/thermal paths for minimal loop inductance.

Technical Context

The LMG3522R030QRQSRQ1 integrates a silicon-based gate driver with precision bias generation, enabling depletion-mode GaN FET control without external level shifters. Its direct-drive architecture eliminates cascode losses and supports first- and third-quadrant conduction with programmable turn-on slew rate via RDRV pin resistance (0–500 kΩ).

Protection logic includes latched short-circuit detection (75–105 A threshold), self-monitoring UVLO on VDD (6.4–7.6 V) and VNEG (−13.3 to −12.1 V), and dual thermal shutdowns (175°C GaN junction, 185°C driver). Fault reporting uses dedicated push-pull outputs: FAULT (global), OC (overcurrent only), and TEMP (9 kHz PWM with duty-cycle-encoded temperature).

Key Specifications

Pinout & Package

Top-side cooled 12 mm × 12 mm VQFN (RQS) package with 52 terminals; thermal pad internally connected to SOURCE and NC2 pins for low-impedance heat transfer. Electrical and thermal paths are physically decoupled to minimize power loop inductance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMG3522R030QRQSRQ1, the LMG3525R030RQ1 offers tighter slew control and higher driver thermal resilience but sacrifices adjustability, while the GS66508T demands full external support infrastructure yet provides greater gate timing flexibility for specialized topologies.

Availability

LMG3522R030QRQSRQ1 is available at Aetrix Electronics and suitable for automotive on-board chargers, server power supplies, telecom rectifiers, and industrial DC/DC converters requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.

Supply support for LMG3522R030QRQSRQ1 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 technologies, with decades of automotive-grade product validation and manufacturing excellence.

The LMG3522R030QRQSRQ1 belongs to TI's automotive-qualified GaN power stage family, designed specifically to replace silicon MOSFETs in high-frequency, high-efficiency power conversion systems for electric vehicles and industrial infrastructure.

FAQ

What is the maximum safe operating voltage for LMG3522R030QRQSRQ1 during surge conditions?

The LMG3522R030QRQSRQ1 is rated for 720 V drain-source surge voltage during hard-switching events, as confirmed in Section 5.1 Absolute Maximum Ratings. This exceeds its 650 V steady-state V_DS rating and enables robust operation in 400 V bus systems subject to IEC 61000-4-5 line surges. The device maintains functionality without latch-up or degradation under these transient conditions when operated within recommended thermal limits.

How does the RDRV pin adjust slew rate in LMG3522R030QRQSRQ1?

The RDRV pin on LMG3522R030QRQSRQ1 sets turn-on slew rate by configuring internal driver strength via an external resistor to SOURCE. A 0 Ω connection yields 150 V/ns, 300 kΩ yields ~90 V/ns, and open or >500 kΩ yields 20 V/ns - verified in Figure 5-4 and Table 5.5. This resistor-based control allows EMI tuning without modifying gate drive loop layout or adding external components.

Does LMG3522R030QRQSRQ1 support third-quadrant conduction, and how is it managed?

Yes, LMG3522R030QRQSRQ1 supports controlled third-quadrant (source-to-drain) conduction via intrinsic GaN channel enhancement when DRAIN voltage falls sufficiently negative relative to SOURCE. Section 7.3.1 defines this behavior and confirms V_T(3rd) = ±0.15 V threshold. The device includes third-quadrant detection (VT(3rd)) and zero-current sensing (IT(ZC)) to enable ideal-diode mode in bridge configurations without external circuitry.

What thermal metrics define the cooling performance of LMG3522R030QRQSRQ1?

LMG3522R030QRQSRQ1 features R_θJC(top) = 0.28 °C/W (junction-to-case, top surface), measured per JEDEC JESD51-2. Its top-side cooled VQFN package directs heat through the exposed thermal pad (internally tied to SOURCE and NC2) to an external heatsink, enabling high-power dissipation without relying on PCB copper area alone - critical for high-density OBC and PSU designs.

Can LMG3522R030QRQSRQ1 be used without the buck-boost converter (BBSW/VNEG)?

No - the LMG3522R030QRQSRQ1 requires the internal buck-boost converter to generate the −14 V VNEG bias for reliable depletion-mode GaN turn-off. Section 4 Pin Functions mandates connecting BBSW to SOURCE via a 3–10 µH inductor and VNEG to SOURCE via a 1–10 µF capacitor. Omitting this circuit results in incomplete channel cutoff and potential shoot-through or thermal runaway.