Monolithic Power Systems Inc. MEZD72402A-F

Overview

MEZD72402A-F from Monolithic Power Systems is a ready-to-use, synchronous step-down DC/DC power supply module delivering 2 A at 3.3 V from a 4.5–36 V input. It integrates controller, MOSFETs, inductor, and input/output capacitors in a QFN-16 package, features hiccup-mode short-circuit protection, ±2.5% output voltage accuracy, and operates across –40°C to +85°C ambient. Used in industrial control power rails requiring compact, pre-validated 3.3 V conversion.

For engineers reviewing the MEZD72402A-F datasheet, MEZD72402A-F pinout, MEZD72402A-F application, or MEZD72402A-F equivalent, key selection criteria include verified 2 A continuous output at 3.3 V, 400 kHz fixed switching frequency, hiccup-mode fault response, thermal shutdown at 150°C, and compatibility with 24 V nominal bus systems in DIN-rail-mounted equipment.

Technical Context

This module implements a fully integrated buck converter architecture with internal high- and low-side MOSFETs, fixed 400 kHz oscillator, and internal compensation. Output voltage is set by factory-trimmed resistors (no external feedback required), supporting only fixed-output variants like 3.3 V (suffix F).

It employs thermal foldback and OTP-triggered shutdown at 150°C, plus line/load regulation better than ±1% under full load. Input UVLO is active below ~4.2 V (for 4.5 V min rating), and startup is controlled via EN pin with internal pull-up.

Key Specifications

Pinout & Package

Package: QFN-16, 5 mm × 5 mm × 1.6 mm, exposed thermal pad (PGND-connected). Pinout confirmed from DIY72402-AX schematic and top-view layout in Rev. 1.4 datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output, integrated buck converter applications.

Compared with MPM3530GQV and TFS7702H, MEZD72402A-F offers plug-and-play 3.3 V operation with minimal layout overhead, whereas alternatives require either external feedback tuning or cannot match the exact output voltage and protection behavior in space-constrained industrial modules.

Availability

MEZD72402A-F is available at Aetrix Electronics and suitable for industrial PLC power rails, railway signaling interfaces, factory automation sensor hubs, and outdoor telecom remote units requiring stable component supply despite its End-of-Life status.

Supply support for MEZD72402A-F 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 and modules for industrial, automotive, and computing markets.

The mEZD72402A series belongs to MPS's ready-to-use power module product line, designed to eliminate design risk and accelerate time-to-market for engineers needing pre-validated, compact DC/DC solutions in harsh environments.

FAQ

Is MEZD72402A-F still in production?

No - MEZD72402A-F is officially End-of-Life per MPS documentation (Rev. 1.4, Feb 2018), with direct migration guidance to MPM3530. Aetrix Electronics maintains legacy stock and supports last-time buys with full traceability and extended warranty terms for qualified industrial programs.

Can MEZD72402A-F be used with 12 V input?

Yes - the 4.5–36 V input range fully covers 12 V nominal systems, including automotive 12 V (with transient tolerance up to ±25%) and industrial 12 V DC supplies. Efficiency exceeds 90% at 12 V input and 2 A load per published curves.

What is the role of the exposed thermal pad?

The exposed thermal pad (Pin 16) is electrically connected to PGND and serves as the primary heat path. It must be soldered to a dedicated copper pour with ≥4 thermal vias to an internal ground plane to maintain junction temperature below 125°C at full load and 85°C ambient.

Does MEZD72402A-F require an enable signal to operate?

No - the module starts automatically when VIN exceeds UVLO threshold (~4.2 V). The EN pin is not brought out; startup is unconditional. There is no standby or shutdown control - operation is always active when input is valid.

How is output voltage accuracy affected by load step changes?

Load regulation is ±1% (typ.) from minimum to full load at 3.3 V output. Transient response shows 0.75 ms rise time (0%→90%), and output deviation remains within ±3.3% for 1 A step loads, per test data at VIN=24 V and T_A=25°C.

Are Gerber files and BOM publicly available?

Yes - MPS provides complete open-design resources including Gerber files, assembly drawings, and full BOM (with manufacturer PNs and packages) upon request to [email protected]. These files are referenced in Rev. 1.4 datasheet and used in the DIY72402-AX reference layout.

What is the maximum recommended PCB copper thickness for thermal pad connection?

MPS recommends ≥2 oz (70 µm) copper on the layer connected to the thermal pad, with ≥4 x 0.3 mm diameter vias filled or capped to inner ground planes. Thicker copper (3–4 oz) further reduces θ_JA by up to 15%, especially under forced-air cooling.