Monolithic Power Systems Inc. EVQ1925-R-00A

Overview

EVQ1925-R-00A from Monolithic Power Systems is a high-frequency, half-bridge gate driver evaluation board configured as a buck converter and built around the MPQ1925HR QFN-8 gate driver IC. It supports 0–100V input voltage, delivers up to 4.5A sink current per channel at 12V VDD, features independent INH/INL PWM inputs with dead-time control, and demonstrates fast switching with <5ns channel-to-channel delay.

For engineers reviewing the EVQ1925-R-00A datasheet, EVQ1925-R-00A pinout, EVQ1925-R-00A application, or EVQ1925-R-00A equivalent, this board enables rapid validation of MPQ1925-based half-bridge topologies in telecom power supplies, avionics DC/DC converters, and active-clamp forward designs under real-world thermal and layout conditions.

Technical Context

The EVQ1925-R-00A implements a functional buck converter using the MPQ1925HR's independently controlled high-side (DRVH) and low-side (DRVL) drivers, each with matched propagation delay (<5ns) and integrated bootstrap diode. It operates with VDD = 8–15V and VPOWER = 0–100V, supporting 200kHz PWM with 200ns dead time as validated in test results.

Board-level protection includes HS/LS under-voltage lockout (UVLO), and its layout incorporates dedicated 2mm and 1mm needle terminals for VPOWER, VLOAD, INH, INL, DRVH, DRVL, SW, and GND-enabling direct oscilloscope probing and external signal injection without soldering.

Key Specifications

Availability

EVQ1925-R-00A is available at Aetrix Electronics and suitable for motor driver development, avionics DC/DC converter prototyping, and telecom half-bridge power supply design requiring stable component supply, quick-turn evaluation, and production-representative thermal and EMI behavior.

Supply support for EVQ1925-R-00A 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 core expertise in DC/DC converters, gate drivers, and motor control solutions.

The MPQ1925 product line targets high-efficiency, high-frequency power conversion systems where tight timing control, low quiescent current (<150 µA), and integrated bootstrap diodes reduce bill-of-materials count in space-constrained applications.

FAQ

What is the primary function of the EVQ1925-R-00A evaluation board?

The EVQ1925-R-00A is a fully assembled, tested buck converter reference design that demonstrates the MPQ1925HR gate driver's performance in real half-bridge operation. It provides accessible signals (INH, INL, DRVH, DRVL, SW), configurable power rails (VDD, VPOWER), and load terminals (VLOAD) for immediate functional validation without PCB redesign.

Can the EVQ1925-R-00A be used with other gate drivers besides MPQ1925HR?

No - the board is specifically laid out for the MPQ1925HR in QFN-8 (4 mm × 4 mm) package, including optimized gate loop area, bootstrap capacitor placement, and UVLO threshold resistors. Substituting another IC would require significant rework due to pinout, drive strength, and bootstrap architecture differences.

What dead time is recommended when driving INH and INL on this board?

The board was validated with 200 ns dead time at 200 kHz PWM frequency. This value prevents shoot-through while maintaining efficiency in buck operation with 48 V input and 1 A load. Dead time must be generated externally via controller; the board itself does not generate or adjust it.

Does the EVQ1925-R-00A include overcurrent or thermal protection?

No - the board implements only the MPQ1925HR's built-in HS/LS UVLO protection. It lacks current-sense circuitry, thermal shutdown ICs, or fault reporting outputs. Users must add external protection (e.g., current-shunt monitor + comparator) for robust system-level safety.

How are the power and signal connections made to the board?

Power and signals connect via labeled 1 mm and 2 mm needle terminals: VDD/GND (driver supply), VPOWER/GND (high-side input), VLOAD/GND (output), plus INH, INL, DRVH, DRVL, and SW test points. No soldering is required - all interfaces support spring-loaded probes or standard banana jacks with adapters.

Is the EVQ1925-R-00A RoHS-compliant and production-ready?

Yes - the board uses RoHS-compliant components and follows MPS's qualified manufacturing process. While intended for evaluation, its 4-layer PCB stack-up, thermal vias under U1, and layout practices align with production-grade design rules for high-frequency gate drivers.