Monolithic Power Systems Inc. EV4541-N-00A

Overview

EV4541-N-00A from Monolithic Power Systems is an evaluation board for the MP4541 synchronous buck converter IC, demonstrating 5V/0.8A output from 8–80V input with integrated 625mΩ/380mΩ MOSFETs, constant-on-time control, and hiccup-mode OCP/SCP - used to validate high-voltage DC-DC conversion in industrial power supplies and battery-pack systems.

For engineers reviewing the EV4541-N-00A datasheet, EV4541-N-00A pinout, EV4541-N-00A application, or EV4541-N-00A equivalent, this board enables rapid validation of MP4541's light-load PSM efficiency, adjustable VOUT via R1/R2 divider, EN-controlled sequencing, and thermal performance up to 0.8A under 72V input.

Technical Context

The EV4541-N-00A implements the MP4541 IC in a fixed 5V output configuration using a 40.2kΩ/10kΩ resistor divider (VFB = 1V), supporting input voltages from 8V to 80V and delivering up to 0.8A continuous output current with 33µH inductor and optimized ceramic capacitor network (C1A–C5).

It demonstrates constant-on-time (COT) control architecture with configurable switching frequency (100kHz–1MHz), internal soft-start, loop compensation, and valley-current-limit protection - validated across line/load regulation, startup/shutdown transients, and short-circuit recovery waveforms per Rev. 1.0 test report.

Key Specifications

Availability

EV4541-N-00A is available at Aetrix Electronics and suitable for industrial power supply validation, high-voltage battery pack prototyping, and printer power board development requiring stable component supply and documented reference design fidelity.

Supply support for EV4541-N-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 a focus on integrated DC-DC solutions for industrial, computing, and automotive markets.

The EV4541-N-00A belongs to MPS's evaluation board product line, designed specifically to accelerate adoption of their MP4541 synchronous buck converter by providing fully tested, layout-optimized hardware with complete test data and schematic documentation.

FAQ

What is the default output voltage and how is it set?

The EV4541-N-00A is configured for 5V output using a resistor divider (R1 = 40.2kΩ, R2 = 10kΩ) referenced to the MP4541's 1V feedback threshold. This ratio yields VOUT = 1V × (1 + 40.2kΩ/10kΩ) = 5.02V, verified in load regulation tests across 0–0.8A.

Can the output voltage be adjusted, and what components must be changed?

Yes - VOUT is adjustable via the FB resistor divider. Replace R1 and R2 to achieve target output using VOUT = 1V × (1 + R1/R2). The board includes pads for 0603 resistors, and Equation (1) in the Quick Start Guide provides exact calculation guidance.

How is enable/disable functionality implemented on this board?

The EN pin (Pin 5 of MP4541GN) is brought out to a test point. Driving EN >1.35V enables regulation; driving EN <0.4V disables the converter and places it in ultra-low quiescent current state - confirmed in EN On/Off transient waveforms on pages 7–8.

What inductor and capacitors are used, and why were they selected?

L1 is a 33µH, 1.4A ISAT shielded inductor (Würth 7447779133); C1A–C5 use X7R/X7S ceramics (Murata/WE) rated ≥100V input or ≥16V output. This selection ensures low ripple, stability under COT control, and thermal margin up to 0.8A at 72V input.

Does the board support frequency adjustment, and how is it done?

Yes - switching frequency is set by connecting a resistor (R4) between FREQ and GND. With R4 = 100kΩ, frequency is ~500kHz; values from 10kΩ to 200kΩ yield 1MHz to 100kHz per MP4541 datasheet. R4 is populated as 100kΩ by default.

Are efficiency curves provided, and under what conditions were they measured?

Yes - Figure 1 shows efficiency vs. load (0–0.8A) at VIN = 12V, 48V, and 72V, all with VOUT = 5V, L = 33µH, TA = 25°C. Peak efficiency reaches 90% at mid-load, consistent with MP4541's PSM operation and low RDS(on) MOSFETs.