Monolithic Power Systems Inc. EV3429-L-00A

Overview

EV3429-L-00A from Monolithic Power Systems is an evaluation board designed to demonstrate the MP3429 synchronous boost converter IC, a 600kHz fixed-frequency, COT-controlled DC-DC converter supporting 2.7–8.4V input and delivering up to 9V/3.5A (30W) from single-cell battery sources. It integrates 6.5mΩ HS and 10mΩ LS MOSFETs, features programmable UVLO, 150°C thermal shutdown, and MODE pin-selectable PSM/FCCM/USM operation.

For engineers reviewing the EV3429-L-00A datasheet, EV3429-L-00A pinout, EV3429-L-00A application, or EV3429-L-00A equivalent, this board enables rapid validation of MP3429's transient response, efficiency at 3.6V→9V/3A (>95%), light-load mode behavior, and output voltage adjustment via external resistor divider (R1=750kΩ, R2=93.1kΩ).

Technical Context

The EV3429-L-00A implements the MP3429GL in a 3×4mm QFN-13 package with 1.5μH power inductor, six 22μF input/output ceramic capacitors, and precision feedback resistors (R1/R2) setting VOUT=9V (VFB=1V). Its layout supports thermal management for 21.5A peak switch current and 30W average load under constrained PCB area.

Test conditions confirm stable operation across startup/shutdown, EN control, and load transients (0↔3.5A at 25mA/μs), with adaptive COT control delivering fast regulation (<100μs recovery) in PSM, FCCM, and USM modes - verified at VIN=3.3V, VOUT=9V, TA=25°C.

Key Specifications

Availability

EV3429-L-00A is available at Aetrix Electronics and suitable for notebook power rail validation, Bluetooth speaker battery-boost applications, and portable POS system design requiring stable component supply and rapid prototyping support.

Supply support for EV3429-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 analog and mixed-signal semiconductor company specializing in high-efficiency power management ICs for consumer, industrial, and automotive markets.

The MP3429 product line targets compact, high-power-density battery-powered systems requiring wide VIN range, integrated FETs, and selectable light-load efficiency modes - optimized for space-constrained portable electronics.

FAQ

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

The EV3429-L-00A board is factory-configured for 9V output using R1=750kΩ and R2=93.1kΩ, based on the MP3429's 1V feedback reference (VOUT = VFB × (1 + R1/R2)). Output voltage can be adjusted by changing R2 while maintaining R1 at 750kΩ per the datasheet formula.

How do I change the operating mode (PSM/FCCM/USM)?

Mode selection is controlled via jumper J1: connect pins 1–2 for FCCM, pins 2–3 for PSM, or leave pin 2 floating for USM (>23kHz switching). The MODE pin on U1 (MP3429GL) directly interfaces with J1; no soldering or component changes are required.

What is the maximum continuous output current and what limits it?

Maximum continuous output current is 3.5A at VIN=2.7V and VOUT=9V, limited primarily by PCB thermal performance and case temperature rise. At higher input voltages (e.g., VIN=3.3V), full 3.5A is sustainable; at VIN=2.7V, derating is required to maintain case temperature below 150°C.

Does the board include soft-start and compensation circuitry?

Yes - the EV3429-L-00A exposes SS (soft-start) and COMP (compensation) pins of the MP3429GL. External capacitor on SS sets startup ramp time; COMP connects to an RC network (C6=6.8nF, R3=6.8kΩ) pre-tuned for stability with the 1.5μH inductor and 22μF output capacitors.

Can this board be used with input voltages below 2.7V?

No - the MP3429 IC has a minimum startup voltage of 2.7V and operational lower limit of 0.8V only after startup. The EV3429-L-00A is validated and rated for 2.7V–8.4V input; operation below 2.7V will prevent initial start-up and is outside specification.

Is overtemperature protection active and how is it implemented?

Yes - the MP3429 integrates a 150°C thermal shutdown circuit that disables switching and holds EN low until junction temperature falls below hysteresis threshold (~140°C). This protection is fully functional on the EV3429-L-00A and verified in thermal stress testing.

What components are included for EMI filtering and stability?

The board uses six 22μF X5R 1210 ceramic capacitors (C1A–C1C, C2A–C2C) for bulk input/output energy storage, plus 0.1μF X7R 0603 (C2D, C5) for high-frequency decoupling, 4.7μF (C3) for mid-band filtering, and 22nF (C4) + 6.8nF (C6) for noise suppression and loop compensation - all selected per MPS application guidelines.