Monolithic Power Systems Inc. MP1918GQE-Z

Overview

MP1918GQE-Z from Monolithic Power Systems is a 100V, high-frequency half-bridge gate driver IC optimized for enhancement-mode GaN FETs and low-threshold N-channel MOSFETs. It features independent HS/LS TTL inputs, separate source/sink gate outputs (HGP/HGN/LGP/LGN), internal bootstrap voltage clamping to VCC, and operation up to several MHz in synchronous buck, half-bridge, and Class-D amplifier topologies.

For engineers reviewing the MP1918GQE-Z datasheet, MP1918GQE-Z pinout, MP1918GQE-Z application, or MP1918GQE-Z equivalent, this driver enables precise dead-time control, dV/dt-immune turn-off via 0.27Ω pull-down, and gate voltage safety for GaN devices through BST-SW clamping - critical for high-efficiency >1MHz power conversion designs.

Technical Context

The MP1918 implements dual independent level-shifted drivers with dedicated high-side floating bias rail (VBST-SW) operating up to 100VDC and clamped to ≤106% of VCC. Its architecture separates gate drive paths: HGP/HGN control HS-FET turn-on/turn-off independently from LGP/LGN for LS-FET, enabling asymmetric slew rate tuning via external gate resistors.

UVLO protection operates on both VCC (3.7–4.5V threshold) and VBST-SW (80–92% of VCC), with distinct logic states defined in Table 2. Bootstrap charging is gated exclusively by PWML = high, eliminating uncontrolled VBST-SW overshoot during LS-FET off-time - a key reliability feature for GaN gate integrity.

Key Specifications

Pinout & Package

MP1918GQE-Z is housed in a QFN-14 (3mm × 3mm) package with wettable flanks for automated optical inspection. The exposed thermal pad is connected to PGND internally and must be soldered to a PCB thermal plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-frequency half-bridge gate driver applications.

Compared with LM5113SDX/NOPB and UCC27611DR, MP1918GQE-Z uniquely integrates BST clamping, sub-2ns delay matching, and dual independent gate outputs in a 3×3mm wettable-flank package - delivering GaN-optimized reliability and layout simplicity not found in general-purpose drivers.

Availability

MP1918GQE-Z is available at Aetrix Electronics and suitable for high-frequency telecom PSUs, Class-D audio amplifiers, synchronous buck converters, and industrial motor drives requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MP1918GQE-Z 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management ICs, with over two decades of expertise in DC-DC conversion, motor control, and gate driver innovation.

The MP1918 belongs to MPS's high-frequency GaN-optimized driver product line, engineered specifically to address gate voltage safety, timing precision, and layout robustness challenges in >500kHz power stages using wide-bandgap transistors.

FAQ

What is the maximum recommended switching frequency for MP1918GQE-Z?

The MP1918GQE-Z supports operation "up to several MHz" per its datasheet description, with verified performance at 1MHz in typical application circuits. Its 15ns minimum gate output pulse width and <30ns propagation delays enable reliable operation at 2–3MHz in optimized layouts with low-inductance gate loops and proper bootstrap capacitor placement.

Does MP1918GQE-Z require an external bootstrap diode?

No. The MP1918GQE-Z uses an internal bootstrap switch and clamping circuitry that eliminates the need for an external diode. Bootstrap charging occurs only when PWML is high, and VBST-SW is actively clamped to ≤106% of VCC - removing reverse recovery concerns and layout sensitivity associated with discrete diodes.

How does the MP1918GQE-Z protect GaN FETs from overvoltage stress?

It employs dual protection: (1) VBST-SW clamping limits bootstrap voltage to 106% of VCC, ensuring gate-source voltage stays within typical GaN FET ratings (e.g., ±6V), and (2) UVLO on VBST-SW forces HS-FET off when bootstrap voltage drops below 80% of VCC, preventing partial turn-on and avalanche stress during startup or fault conditions.

Can MP1918GQE-Z drive both GaN and silicon MOSFETs?

Yes. It is explicitly designed for enhancement-mode GaN FETs and low-threshold N-channel MOSFETs. Its 0.27Ω pull-down and 1.2Ω pull-up resistances, TTL-compatible inputs, and 5A sink capability provide optimal drive strength for both technologies - though gate resistor values may require adjustment to match specific device Q_g and dV/dt requirements.

What is the purpose of the separate AGND and PGND pins?

AGND serves as the reference for PWM inputs and internal logic to minimize noise coupling from high-current switching paths. PGND provides the low-inductance return for LS gate drive and VCC decoupling. Separating them prevents ground bounce from corrupting input signals and improves noise immunity - especially critical in high-dV/dt GaN applications where common-source inductance can induce false triggering.

Is MP1918GQE-Z RoHS and halogen-free compliant?

Yes. All MPS parts, including MP1918GQE-Z, are lead-free, halogen-free, and fully compliant with the EU RoHS directive. Full compliance documentation and material declarations are available on the MPS Quality Assurance website.