Monolithic Power Systems Inc. MEZD72401A-G

Overview

MEZD72401A-G from Monolithic Power Systems is a 1A, synchronous step-down DC/DC power supply module with fixed 5.0V output, 4.5–36V input range, ±2.5% output voltage accuracy, 400kHz switching frequency, and hiccup-mode short-circuit protection. It integrates power MOSFETs, inductor, and compensation circuitry in a QFN-16 package and is used in industrial control power rails requiring compact, ready-to-use regulation.

For engineers reviewing the MEZD72401A-G datasheet, MEZD72401A-G pinout, MEZD72401A-G application, or MEZD72401A-G equivalent, key selection factors include input voltage headroom (VIN > VOUT +1V), thermal derating above 85°C ambient, hiccup-mode fault response, and compatibility with 22µF ceramic output capacitance at 10V rating.

Technical Context

The MEZD72401A-G implements a current-mode controlled synchronous buck converter with integrated high- and low-side MOSFETs, internal compensation, and a dedicated EN pin for external enable control. It supports adjustable soft-start via external capacitor on the EN pin and includes open-drain power-good (PG) signaling through the VOUT pin during valid regulation.

Thermal management relies on PCB copper area under the exposed thermal pad (Pin 16) and operates with over-temperature shutdown at 150°C (rising edge). Input ripple rejection is maintained across 4.5–36V via feedforward compensation, and line/load regulation remains within ±1% typical at 3.3V output under full load.

Key Specifications

Pinout & Package

MEZD72401A-G uses a thermally enhanced QFN-16 package (5mm × 5mm × 1.0mm) with an exposed thermal pad (Pin 16) requiring solder connection to PCB ground plane for thermal conduction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down power module applications.

Compared with MEZD72401A-G, MPM3530GQV offers higher current and frequency for denser designs, while TFS7701-5.0 trades integration for mechanical flexibility-neither matches the exact 1A/5V/QFN-16 form factor and thermal performance of the original.

Availability

MEZD72401A-G is available at Aetrix Electronics and suitable for industrial PLC I/O power, automotive body control modules, point-of-load telecom supplies, and medical diagnostic sensor interfaces requiring stable component supply despite end-of-life status.

Supply support for MEZD72401A-G 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 applications.

The mEZD72401A series belongs to MPS's ready-to-use DC/DC module product line, designed to replace discrete buck regulator designs with fully integrated, tested, and characterized power solutions for rapid prototyping and production deployment.

FAQ

Is MEZD72401A-G still in production?

No - MEZD72401A-G is officially marked End-of-Life (EOL) by Monolithic Power Systems as of Rev. 1.5 (July 2019). The recommended replacement is MPM3530GQV, which shares identical pinout, package, and functional architecture with enhanced current and frequency specs.

What is the minimum input voltage required for 5V output?

The minimum input voltage is 6.5V, as specified in the "Input Voltage (V)" row for option G in the ordering table. This satisfies the VIN > VOUT + 1V requirement for proper regulation and dropout margin under full load and temperature extremes.

Does MEZD72401A-G require external feedback resistors?

No - MEZD72401A-G is a fixed-output module with internal feedback divider. No external resistors are needed for voltage setting. The 'G' suffix denotes factory-trimmed 5.0V output, verified to ±2.5% accuracy across temperature and line/load conditions.

How is power-good signaling implemented?

Power-good is indicated via the VOUT pin: when regulation is valid, VOUT remains at 5.0V; during undervoltage, overtemperature, or short-circuit faults, VOUT is actively pulled low (open-drain behavior), enabling direct connection to MCU reset or supervisor inputs without external logic.

Can MEZD72401A-G operate with forced-air cooling?

Yes - the QFN-16 thermal pad design supports both natural convection and forced-air cooling. Derating curves in the datasheet show 1A output sustained up to 105°C ambient with 200LFM airflow, extending usable temperature range beyond the standard −40°C to +85°C rating.

What is the purpose of the BST pin?

The BST (bootstrap) pin is internally connected to the high-side MOSFET gate driver and requires a 0.1µF ceramic capacitor between BST and SW pins. This capacitor sustains gate drive voltage during high-side conduction and is mandatory for stable operation - omission causes immediate dropout or oscillation.

Are Gerber files and BOM publicly available?

Yes - Monolithic Power Systems provides complete open-design resources including Gerber files, assembly drawings, and bill-of-materials for the mEZD72401A series upon request to [email protected]. These files are intended for copy-exact manufacturing and layout verification.