Monolithic Power Systems Inc. MEZD72401A-E

Overview

MEZD72401A-E from Monolithic Power Systems is a 1A, synchronous step-down DC/DC power supply module with fixed 2.5V 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 components in a QFN-16 package and is used in industrial control power rails requiring compact, ready-to-use regulation.

For engineers reviewing the MEZD72401A-E datasheet, MEZD72401A-E pinout, MEZD72401A-E application, or MEZD72401A-E equivalent, key selection considerations include input voltage headroom (VIN > VOUT +1V), thermal derating above 85°C ambient, hiccup-mode fault response, and compatibility with 22µF X7T/X5R output capacitors per the reference design.

Technical Context

This module implements a current-mode controlled synchronous buck converter with integrated high- and low-side MOSFETs, internal bootstrap diode, and fixed-frequency PWM operation at 400kHz. It supports output voltages from 1.0V to 12V via factory-set options and requires no external feedback resistors.

Protection features include over-current detection triggering hiccup mode, over-temperature shutdown at 150°C, and under-voltage lockout. The device operates across –40°C to +85°C ambient and maintains ±1% line/load regulation at 3.3V output under full load.

Key Specifications

Pinout & Package

Package: QFN-16, 5.5mm × 5.2mm × 1.8mm body, exposed thermal pad (PGND-connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MEZD72401A-E, MPM3530GQV offers 3× output current at larger footprint and cost, while TFS7702-2.5 trades lower ripple tolerance and tighter accuracy for higher switching frequency and smaller passive count - both require layout revision and thermal revalidation.

Availability

MEZD72401A-E is available at Aetrix Electronics and suitable for industrial PLC I/O modules, factory automation sensor hubs, medical diagnostic front-ends, and test & measurement signal generators requiring stable component supply and long-term design continuity.

Supply support for MEZD72401A-E 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, computing, automotive, and telecom applications.

The mEZD72401A series belongs to MPS's ready-to-use power module product line, designed to eliminate power design complexity by integrating all active and passive power-stage components into a single surface-mount package for rapid deployment in space-constrained systems.

FAQ

Is MEZD72401A-E still in active production?

No - MEZD72401A-E is End-of-Life (EOL) as stated in the official datasheet revision 1.5. Monolithic Power Systems recommends migration to MPM3530GQV for new designs. Aetrix Electronics maintains limited legacy stock for existing production continuity but does not offer long-term EOL support.

What is the recommended input capacitor configuration?

The reference design specifies a 0.22µF X5R 0402 ceramic capacitor (C1) placed adjacent to the VIN pin, plus bulk capacitance using two 22µF X7T/X5R 0805 capacitors (C3/C4) on the output side. Input bulk capacitance is not explicitly defined in the BOM but should provide ≥10µF low-ESR ceramic or polymer near the module.

Can MEZD72401A-E be used with an input voltage below 4.5V?

No - the absolute minimum input voltage is 4.5V. Operation below this threshold violates the specified VIN_MIN condition (VIN must exceed VOUT by at least 1V), and the device will not regulate. For 2.5V output, minimum valid input is 3.5V, but the datasheet enforces 4.5V as the hard lower limit regardless of output setting.

Does the thermal pad (Pin 16) require solder paste and reflow connection?

Yes - the exposed thermal pad must be soldered to a dedicated PCB copper pour connected to PGND. The datasheet states it is "tied to PGND" and is essential for thermal performance and electrical noise control. Omitting this connection risks thermal shutdown and increased output ripple.

How does hiccup-mode short-circuit protection behave under sustained fault?

Upon short-circuit detection, the device disables switching, waits a fixed recovery interval (~100ms), then attempts restart. If the fault persists, it repeats the cycle indefinitely - limiting average power dissipation to safe levels without requiring manual reset or external circuitry.

Are Gerber files and BOM publicly available for MEZD72401A-E?

Yes - Monolithic Power Systems provides open design files including Gerber data, complete BOM with manufacturer PNs, and schematic for the DIY72401-AX reference board. These are accessible upon request via [email protected] and are intended for direct copy-exact implementation.

What is the MTBF value and how was it calculated?

The calculated MTBF is 4185 × 10³ hours, derived per MIL-HDBK-217F reliability prediction methodology at 25°C ambient. This is a theoretical metric based on component count, stress factors, and failure rate models - not an empirically measured lifetime. Actual field reliability depends on thermal management, voltage derating, and PCB layout quality.