Monolithic Power Systems Inc. MEZD72401A-C

Overview

MEZD72401A-C from Monolithic Power Systems is a ready-to-use, 1A synchronous step-down DC/DC power supply module with fixed 1.5V 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, targeting industrial control I/O modules requiring compact, robust 1.5V rail generation.

For engineers reviewing the MEZD72401A-C datasheet, MEZD72401A-C pinout, MEZD72401A-C application, or MEZD72401A-C equivalent, key selection criteria include input voltage headroom (VIN > VOUT +1V), thermal derating above 85°C ambient, hiccup-mode fault recovery behavior, and compatibility with 0805/1206 external capacitors per reference design.

Technical Context

This module implements a fully integrated buck converter with internal high- and low-side MOSFETs, fixed-frequency current-mode control, and internal compensation. It supports output voltages from 1.0V to 12V via factory-set options - the -C suffix denotes 1.5V output.

Thermal management relies on PCB copper area and natural convection; power derating begins at 85°C ambient, with over-temperature protection triggering at 150°C. Input under-voltage lockout and over-voltage protection are built-in, and enable (EN) pin control is available via external pull-up.

Key Specifications

Pinout & Package

Package: Integrated QFN-based module with integrated inductor; 16-pin QFN footprint (U1 position in DIY schematic), but only 3 terminals brought out to board edges: VIN, GND, VOUT. Mechanical outline matches DIY72401-AX reference layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 1A integrated buck regulator applications.

Compared with MEZD72401A-C, MPM3530GQV offers longer-term availability and tighter regulation, while TSM10501.5 trades hiccup recovery for slightly better accuracy and higher frequency - both require validation of EN timing and thermal performance under identical airflow conditions.

Availability

MEZD72401A-C is available at Aetrix Electronics and suitable for industrial PLC I/O modules, factory automation sensor hubs, medical diagnostic interface boards, and ruggedized data acquisition units requiring stable component supply despite end-of-life status.

Supply support for MEZD72401A-C 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 power module product line, designed to accelerate development of compact, reliable DC/DC solutions for space-constrained industrial and medical equipment.

FAQ

Is MEZD72401A-C still in production?

No - MEZD72401A-C is officially marked End-of-Life by Monolithic Power Systems as of Rev. 1.5 (July 2019). Aetrix Electronics maintains limited legacy stock and supports last-time buys with full traceability and documentation. Migration to MPM3530GQV is recommended for new designs.

What is the minimum input voltage required for 1.5V output?

The datasheet specifies VIN must be at least 1V higher than VOUT for proper regulation. Therefore, minimum input voltage is 2.5V. However, the rated input range starts at 4.5V - operation below that is not characterized or guaranteed for stability, efficiency, or protection behavior.

Can MEZD72401A-C be used without the enable (EN) pin connected?

Yes - the EN pin is internally pulled high. Leaving it open defaults to enabled operation. Pulling EN low disables output and reduces quiescent current to <10µA. No external pull-up resistor is required unless active control or precise power sequencing is needed.

Does the module require external compensation components?

No - MEZD72401A-C is fully compensated internally. The reference design uses only input/output capacitors and an integrated inductor. No external RC networks, compensation pins, or loop-stability adjustments are needed for stable operation across the full load and temperature range.

How does hiccup-mode protection behave during sustained short-circuit?

Under sustained short-circuit, the module cycles into current-limit, shuts down, cools briefly (~100ms), then attempts restart. This repeats until fault is cleared. Unlike latch-off, it avoids permanent disable but limits average power dissipation to safe thermal levels - verified per MIL-HDBK-217F MTBF of 4185×10³ hours.

What is the recommended PCB layout for thermal performance?

Use ≥2 oz copper on top and bottom layers with thermal vias under the module's exposed pad (connected to GND). Maintain ≥100 mm² total copper area for GND plane. Follow the DIY72401-AX Gerber files: place 2×22µF 0805 output caps within 3mm of VOUT/GND pins and minimize VIN loop area with 0.22µF 0402 near VIN pin.

Is the 1.5V output adjustable via external resistors?

No - MEZD72401A-C has factory-trimmed, non-adjustable 1.5V output. The -C suffix indicates fixed 1.5V configuration. Adjustable versions (e.g., mEZD72402A-X) exist but require different part numbers and are not pin-compatible with this module.