Monolithic Power Systems Inc. EVQ3426-L-00A

Overview

EVQ3426-L-00A from Monolithic Power Systems is an evaluation board for the MPQ3426 6A, 35V current-mode boost converter IC, featuring programmable switching frequency (300kHz–2MHz), adjustable UVLO, soft-start, and thermal shutdown. It delivers 12V/2A output from 6–9V input using a 5.5μH inductor and ceramic capacitors, and is pre-configured with R2=178kΩ and R5=66.5kΩ for 12V output and 600kHz operation.

For engineers reviewing the EVQ3426-L-00A datasheet, EVQ3426-L-00A pinout, EVQ3426-L-00A application, or EVQ3426-L-00A equivalent, this board enables rapid validation of MPQ3426-based high-efficiency boost designs in telecom power supplies, audio biasing, and automotive subsystems-supporting quick VOUT and fSW reconfiguration via external resistors.

Technical Context

The EVQ3426-L-00A implements the MPQ3426 IC in a fixed-layout 2.5" × 2.5" PCB with exposed-pad QFN-14 footprint, supporting direct measurement of switch-node waveforms, load transient response, and efficiency across input voltage (6–9V) and temperature (−40°C to +140°C). It integrates all critical passive components-including 22μF/50V input cap (C1), 5.5μH/10A inductor (L1), and STPS5L60U Schottky diode (D1)-for immediate functional testing.

Board-level design enables full characterization of MPQ3426 features: programmable UVLO hysteresis via R4, soft-start timing via C9, and loop compensation via COMP pin access. CN1 jumper enables/disables EN signal, and test points provide direct access to VIN, VOUT, SW, AGND, and PGND nodes for oscilloscope probing.

Key Specifications

Availability

EVQ3426-L-00A is available at Aetrix Electronics and suitable for telecom power supply validation, audio microphone/tuner bias circuit prototyping, and automotive subsystem DC-DC stage development requiring stable component supply and fast time-to-test.

Supply support for EVQ3426-L-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 analog and power ICs, with over two decades of leadership in DC-DC conversion, LED drivers, and motor control solutions.

The MPQ3426 product line targets high-current, wide-input boost applications where compact size, low EMI, and flexible configuration are critical-especially in space-constrained telecom, audio, and automotive modules.

FAQ

What input voltage range is supported on the EVQ3426-L-00A board?

The board is validated for 6V–9V input per the Quick Start Guide, but it interfaces directly with the MPQ3426 IC, which operates from 3.2V to 22V. Operation outside 6–9V requires verification of inductor saturation, capacitor voltage rating, and thermal performance under load.

How do I adjust the output voltage on this evaluation board?

VOUT is set by the R2/R3 resistor divider on the FB pin. With R3 = 20kΩ fixed and VFB = 1.225V, replace R2 using the formula VOUT = VFB × (1 + R2/R3). For example, 15V output requires R2 ≈ 245kΩ (1% tolerance).

Can I change the switching frequency, and how?

Yes-frequency is set by resistor R5 on the FSET pin. Use the formula FSET (MHz) = 23 × R5^−0.86, where R5 is in kΩ. Default R5 = 66.5kΩ yields ~600kHz; reducing R5 increases fSW, enabling smaller inductors but requiring careful EMI filtering.

Does the board include thermal protection monitoring capability?

No dedicated thermal sensor is onboard, but the MPQ3426 IC integrates internal thermal shutdown at 160°C. Board-level thermal performance can be assessed via IR imaging of the U1 QFN-14 package and exposed pad, especially under sustained 2A load at elevated ambient temperatures.

Is the EN pin accessible for external control?

Yes-the EN function is routed to CN1 header pins. Installing the CN1 shunt jumper enables automatic enable at VIN application; removing it allows external TTL-compatible logic (0–1.2V = disable, >1.4V = enable) to control startup sequencing.

Are test points provided for key signals?

Yes-dedicated solder pads and vias offer direct access to VIN, VOUT, SW (switch node), AGND, and PGND. These support oscilloscope probing without soldering, enabling accurate measurement of ripple, switching waveforms, and ground separation effects.