Monolithic Power Systems Inc. EV4470A-L-01A

Overview

EV4470A-L-01A from Monolithic Power Systems is a fully assembled and tested evaluation board for the MPQ4470AGL synchronous step-down converter, delivering 3.3V/5A output from a 4.5–36V input. It integrates internal 40mΩ high-side and 20mΩ low-side MOSFETs, operates at 500kHz switching frequency, and supports programmable soft-start and low-dropout mode.

For engineers reviewing the EV4470A-L-01A datasheet, EV4470A-L-01A pinout, EV4470A-L-01A application, or EV4470A-L-01A equivalent, this board enables rapid validation of MPQ4470AGL performance in automotive power rails, industrial POL systems, optical communication supplies, and notebook I/O power designs under real load and line transient conditions.

Technical Context

The EV4470A-L-01A implements a fixed 3.3V output configuration using the MPQ4470AGL IC, which features proprietary switching-loss-reduction technology and a 0.815V feedback reference. It lacks OVP latch functionality (distinguishing it from the MPQ4470GL-based EV4470-L-01A), enabling safer operation in systems where overvoltage recovery must be non-latching.

Board-level design includes a 10µH power inductor (Wurth 7443251000), dual 22µF/16V ceramic output capacitors, and precision resistor network (R1=31.6kΩ, R2=10kΩ) to set VOUT with ±1% regulation accuracy. Input filtering uses three parallel ceramic capacitors (10µF + 10µF + 0.1µF) across 1210 and 0603 packages.

Key Specifications

Availability

EV4470A-L-01A is available at Aetrix Electronics and suitable for automotive power rail validation, industrial point-of-load (POL) prototyping, and optical transceiver supply development requiring stable component supply and fast-turn evaluation support.

Supply support for EV4470A-L-01A 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 conversion, LED drivers, and motor control solutions.

The MPQ4470A product line delivers high-efficiency, fast-transient synchronous buck regulators for demanding 5A applications in space-constrained automotive, networking, and industrial environments - designed for robustness across wide input voltage ranges and rapid load steps.

FAQ

What input voltage range does the EV4470A-L-01A support?

The board accepts 4.5V to 36V DC input, validated per MPS datasheet test conditions. This range accommodates 12V and 24V automotive batteries, industrial 24V rails, and telecom 48V-derived supplies after intermediate regulation. UVLO threshold is set by R5/R8 divider to ~7.5V nominal turn-on.

How is output voltage set, and can it be adjusted?

VOUT is fixed at 3.3V via R1=31.6kΩ and R2=10kΩ, referencing the MPQ4470AGL's 0.815V FB pin. The board supports reconfiguration: replace R1/R2 to target other outputs (e.g., 5V, 1.8V), but compensation components (C4, R4, C6) must be recalculated per MPS AN-107 application note.

Does the EV4470A-L-01A include enable and power-good functions?

Yes. EN pin accepts 0–5V logic: >1.25V enables regulation; <0.86V disables it. PGOOD pin asserts high when VOUT is within ±10% of regulation and UVLO is cleared. Both signals are routed to test points and compatible with standard logic-level microcontrollers.

What thermal performance can be expected at full 5A load?

At VIN=12V, VOUT=3.3V, TA=25°C, the board achieves >92% peak efficiency and ΔT ≈ 28°C rise on the MPQ4470AGL QFN20 package. Thermal relief is provided by 6× PGND pads and internal copper planes; forced airflow improves sustained 5A capability.

Is the EV4470A-L-01A RoHS-compliant and lead-free?

Yes. All components-including MPQ4470AGL, Wurth inductor, Murata/TDK capacitors, and Yageo resistors-are RoHS-compliant and lead-free per MPS green status documentation. Board finish is ENIG, and solder paste meets IPC-J-STD-020 moisture sensitivity level 3.