Monolithic Power Systems Inc. EVQ4560-Q-00A

Overview

EVQ4560-Q-00A from Monolithic Power Systems is a fully assembled and tested evaluation board for the MPQ4560 step-down DC/DC converter IC, supporting 8–55V input and delivering regulated 5V/2A output at 700kHz switching frequency. It integrates the MPQ4560DQ QFN10 (3mm×3mm) regulator with internal 250mΩ MOSFET, current-mode control, and programmable soft-start. Designed for high-voltage industrial and automotive power conversion validation.

For engineers reviewing the EVQ4560-Q-00A datasheet, EVQ4560-Q-00A pinout, EVQ4560-Q-00A application, or EVQ4560-Q-00A equivalent, this board enables rapid functional verification of the MPQ4560's 55V-input buck regulation, EN-controlled startup, FB-based output adjustment, and thermal performance under 2A load - prior to custom PCB design.

Technical Context

The EVQ4560-Q-00A implements the MPQ4560's current-mode control architecture with fixed 700kHz switching frequency, 0.8V feedback reference, and integrated 250mΩ high-side MOSFET. Input UVLO is preset to ~3.8V via R1/R2 divider; EN threshold is 1.23V (falling) / 1.55V (rising).

Output voltage is set to 5V using R6 (23.7kΩ) and R8 (124kΩ); compensation network includes C10 (330pF), R5 (47.5kΩ), and C7/C9 (0.1μF). Layout features dual inductors (L1 = 10μH/2.4A, L2 = 22μH/3A) and multi-capacitor filtering across VIN, SW, and VOUT nodes.

Key Specifications

Availability

EVQ4560-Q-00A is available at Aetrix Electronics and suitable for high-voltage power system validation, automotive subsystem prototyping, and industrial DC/DC design verification requiring stable component supply and pre-tested reference performance.

Supply support for EVQ4560-Q-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 core expertise in DC/DC converters, LED drivers, and motor drivers.

This evaluation board supports the MPQ4560 product line - designed for wide-input industrial and automotive power supplies where 55V operation, integrated MOSFETs, and current-mode stability are critical.

FAQ

What is the purpose of the EVQ4560-Q-00A?

The EVQ4560-Q-00A is a ready-to-use evaluation board for the MPQ4560 buck converter IC. It allows engineers to validate 5V/2A output performance, EN control behavior, transient response, and thermal characteristics under real 8–55V input conditions - without designing a custom PCB.

Can I adjust the output voltage?

Yes. The board is configured for 5V output using R6 (23.7kΩ) and R8 (124kΩ), but VOUT can be adjusted from 0.8V upward by recalculating R8 per the formula: R8 = 29.625 × (VOUT − 0.8) kΩ. Compensation components must be reselected per the MPQ4560 datasheet when changing VOUT.

Is the switching frequency adjustable on this board?

No. Although the MPQ4560 supports programmable frequency up to 2MHz via the FREQ pin, the EVQ4560-Q-00A fixes frequency at 700kHz using internal oscillator configuration - no external resistor is populated on the FREQ node.

What is the role of the magnetic beads FB1 and FB2?

FB1 and FB2 (BLM31PG330SH1L, 1206) are placed between VIN and the MPQ4560's BST and SW pins to suppress high-frequency noise coupling into the bootstrap circuit and switching node, improving EMI performance and gate-drive stability.

Why is this board marked "Not Recommended for New Designs"?

MPS has superseded the EVQ4560-Q-00A with the EVQ4572-QB-00A evaluation board for the newer MPQ4572 - which offers improved efficiency, lower quiescent current, and enhanced protection features. Legacy design reuse is supported, but new projects should adopt the updated platform.

Does the board include input overvoltage or reverse-polarity protection?

No. The EVQ4560-Q-00A provides no integrated input overvoltage clamping or reverse-polarity protection. Users must ensure external input conditioning - such as TVS diodes or ideal diode controllers - when operating in harsh environments like automotive or industrial settings.