Monolithic Power Systems Inc. EV3431-L-00A

Overview

EV3431-L-00A from Monolithic Power Systems is an evaluation board designed to demonstrate the MP3431 synchronous boost converter IC, a 600kHz fixed-frequency, wide-input (3–8.4V), 9V/3.5A output converter delivering up to 30W from single-cell batteries in portable power applications.

For engineers reviewing the EV3431-L-00A datasheet, EV3431-L-00A pinout, EV3431-L-00A application, or EV3431-L-00A equivalent, this board enables rapid validation of MP3431's COT control, programmable input current limit (13A), light-load mode selection (PSM/USM/FCCM), thermal shutdown (150°C), and integrated 6.5mΩ/10mΩ MOSFET performance under real load transients and startup conditions.

Technical Context

The EV3431-L-00A implements the MP3431GL QFN-13 IC with constant-off-time (COT) control architecture, enabling fast transient response and stable regulation across 3–8.4V input while delivering 9V at up to 3.5A. It supports three selectable light-load operating modes-pulse-skipping (PSM), ultra-sound (USM >23kHz), and forced continuous conduction (FCCM)-via the MODE pin.

Board-level design includes external soft-start (SS), compensation (COMP), feedback (FB), and input current limit (ILIM) interfaces, along with a 1.5µH power inductor rated for 19A RMS and low-ESR 22µF ceramic output capacitors. Input UVLO and overtemperature protection are fully implemented per MP3431 specifications.

Key Specifications

Availability

EV3431-L-00A is available at Aetrix Electronics and suitable for notebook power rails, Bluetooth speaker battery-boost systems, and portable POS terminal DC-DC conversion requiring stable component supply and rapid prototyping capability.

Supply support for EV3431-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 expertise in DC-DC conversion, motor drivers, and LED lighting controllers.

The MP3431 product line targets compact, high-efficiency boost solutions for single-cell Li-ion and Li-polymer battery-powered devices where space, thermal headroom, and light-load efficiency are critical.

FAQ

What input voltage range is supported on the EV3431-L-00A board?

The board operates with a verified input range of 3V to 8.4V DC. It starts reliably from 2.7V per MP3431 specification, but the evaluation board layout and component ratings are optimized for 3–8.4V operation, including full 3.5A output capability at 3.3V input.

How do I adjust the output voltage on EV3431-L-00A?

VOUT is set by the R1/R2 resistor divider on the FB pin, using VOUT = VFB × (1 + R1/R2) where VFB = 1V. Default R1 = 750kΩ and R2 = 93.1kΩ yield 9V. Replace R2 to scale output linearly - e.g., 100kΩ yields ~9.5V - while maintaining stability per MP3431 compensation guidelines.

Which light-load modes does the board support, and how are they selected?

The board supports PSM, USM (>23kHz), and FCCM via jumper J1: connect pins 1–2 for FCCM, 2–3 for PSM, or leave pin 2 floating for USM. Mode selection directly configures the MP3431's internal control logic without firmware or external timing components.

Does the EV3431-L-00A include overcurrent protection?

Yes - the board implements MP3431's programmable input current limit (13A typical) via the ILIM pin and cycle-by-cycle peak inductor current limiting through the integrated 6.5mΩ/10mΩ MOSFETs. Overcurrent entry and recovery behavior is documented in test reports with controlled ramp loads.

Is the MP3431GL IC soldered to the board, and what package does it use?

Yes - the MP3431GL is permanently mounted in a 13-pin QFN package measuring 3mm × 4mm with exposed thermal pad. The board uses standard reflow-compatible layout and thermal vias beneath the IC to support sustained 30W operation and thermal testing per datasheet limits.