Monolithic Power Systems Inc. EVQ2451-G-01A

Overview

EVQ2451-G-01A from Monolithic Power Systems is an evaluation board for the MPQ2451 fixed-frequency 2MHz step-down DC/DC converter IC, supporting 8–36V input and delivering regulated 5V/0.3A output with integrated high-side MOSFET, current-mode control, and soft-start. It enables rapid validation of high-voltage power conversion in space-constrained industrial and automotive applications.

For engineers reviewing the EVQ2451-G-01A datasheet, EVQ2451-G-01A pinout, EVQ2451-G-01A application, or EVQ2451-G-01A equivalent, this board provides verified layout, BOM, test data, and EN-controlled startup behavior - critical for evaluating MPQ2451-based 5V supply designs under real load and thermal conditions.

Technical Context

The EVQ2451-G-01A implements a synchronous buck topology using the MPQ2451 QFN6L-2×2mm IC, which integrates a 36V-rated high-side MOSFET and internal current-mode PWM controller. It operates at a fixed 2MHz switching frequency to minimize external passive size, with built-in soft-start (preventing inrush) and thermal shutdown.

Board-level design includes a 6.8μH power inductor (VLS3015E-6R8M), 2.2μF/16V input capacitors, 4.7μF/6.3V output capacitors, and a 33pF compensation capacitor (C6) matching the MPQ2451's Type-II loop compensation requirements per its datasheet.

Key Specifications

Availability

EVQ2451-G-01A is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial sensor node supplies, and battery-powered portable instrumentation requiring stable component supply, fast design iteration, and pre-validated EMI compliance.

Supply support for EVQ2451-G-01A 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 analog semiconductor company specializing in high-performance power management ICs, including DC/DC converters, LED drivers, and motor drivers, with global manufacturing and quality certifications.

The MPQ2451 product line targets high-input-voltage, low-output-current applications where small solution size, light-load efficiency, and robust thermal performance are essential - especially in automotive and industrial environments.

FAQ

What is the primary purpose of the EVQ2451-G-01A board?

This board is a fully assembled, tested evaluation platform for the MPQ2451 step-down regulator IC. It allows engineers to validate 5V/0.3A power delivery from 8–36V inputs, verify thermal behavior, assess EMI performance, and prototype feedback adjustments - without designing a custom PCB.

Can the output voltage be adjusted, and how?

Yes. The board ships with fixed 5V output via R1=23.7kΩ and R2=124kΩ. To change V_OUT, replace R1 and R2 using the formula R1 = R2 × (V_OUT − 0.8V)/0.8V. Compensation components (C6, C7) may require recalibration per MPQ2451 datasheet guidelines.

Does the board include thermal protection and startup safeguards?

Yes. The underlying MPQ2451 IC features internal thermal shutdown and soft-start circuitry. Test reports confirm no inductor current runaway during cold start, and board operation safely halts above 150°C junction temperature, resuming after cooldown.

What are the key passive components used on this board?

The board uses a TDK VLS3015E-6R8M 6.8μH power inductor, Murata GRM188R61C225KE15D 2.2μF/16V input caps, GRM188R60J475KE19D 4.7μF/6.3V output caps, and ZLLS350TA Schottky diode - all selected to match MPQ2451's 2MHz operation and transient response targets.

Is EN pin functionality demonstrated on this board?

Yes. The EN pin is brought out to a test point and supports logic-level control: applying >1.8V enables regulation; <1.2V disables it. Floating EN defaults to OFF - verified in startup tests and documented in the Quick Start Guide.

How does this board support EMI-sensitive designs?

Test data shows the board meets EN55022 Class B conducted and radiated emissions limits at 3m without external filters. Layout follows MPS-recommended practices: tight power loops, ground plane integrity, and strategic placement of C6 (33pF NP0) for noise suppression.