Monolithic Power Systems Inc. MEZD72402A-C

Overview

MEZD72402A-C from Monolithic Power Systems is a ready-to-use, synchronous step-down DC/DC power supply module delivering 2 A at 1.5 V output from a 4.5–36 V input. It integrates controller, MOSFETs, inductor, and compensation components in a QFN-16 package, operating at 400 kHz with hiccup-mode short-circuit protection and ±2.5% output voltage accuracy. Used in industrial control power rails where compact, pre-validated 1.5 V biasing is required.

For engineers reviewing the MEZD72402A-C datasheet, MEZD72402A-C pinout, MEZD72402A-C application, or MEZD72402A-C equivalent, key selection factors include its fixed 1.5 V output option (C suffix), 2 A continuous load capability, integrated inductor, thermal derating behavior up to 85°C ambient, and EOL status requiring migration planning to MPM3530.

Technical Context

The MEZD72402A-C implements a constant-frequency current-mode synchronous buck converter with internal high- and low-side MOSFETs, supporting input voltages as low as 4.5 V (≥1 V above VOUT) and up to 36 V. Its 400 kHz switching frequency balances efficiency and EMI performance while enabling use of compact external capacitors (e.g., 22 µF X7T/X5R 0805).

It features hiccup-mode short-circuit protection, over-temperature shutdown at 150°C, and ±1% line/load regulation (at 3.3 V output). Output voltage ripple is 26.4 mV RMS under 24 V input, 3.3 V output, full-load conditions - confirming stable low-noise operation for sensitive analog or logic rails.

Key Specifications

Pinout & Package

Package: QFN-16, 5.5 mm × 5.5 mm × 1.6 mm, exposed thermal pad. Pin-compatible with DIY72402-AX reference design layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck module applications.

Compared with MEZD72402A-C, MPM3530 offers higher current and density but requires revalidation; TSM12024 retains 2 A capability but sacrifices integration and fault resilience - making MEZD72402A-C optimal for drop-in replacement where thermal and layout constraints permit its 5.5 mm footprint.

Availability

MEZD72402A-C is available at Aetrix Electronics and suitable for industrial PLC I/O modules, FPGA configuration rails, test equipment digital subsystems, and smart sensor signal conditioning requiring stable component supply despite end-of-life status.

Supply support for MEZD72402A-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, headquartered in Kirkland, WA, with global design and support centers.

The mEZD72402A series belongs to MPS's ready-to-use power module product line, designed to accelerate time-to-market for industrial and embedded systems requiring validated, compact DC/DC solutions without custom magnetics or loop compensation.

FAQ

Is MEZD72402A-C still in production?

No - MEZD72402A-C is officially End-of-Life (EOL) per MPS documentation. Production ceased after Rev. 1.4 (Feb 2018), and MPS recommends migration to MPM3530 for new designs. Aetrix Electronics maintains limited legacy stock with full traceability for ongoing maintenance and repair programs.

What does the 'C' suffix indicate in MEZD72402A-C?

The 'C' suffix specifies a factory-programmed 1.5 V fixed output voltage. This eliminates external feedback resistors and ensures ±2.5% accuracy without user calibration. Other options include A (1.0 V), B (1.2 V), D (1.8 V), E (2.5 V), F (3.3 V), and G (5.0 V).

Can MEZD72402A-C operate with 5 V input?

No - minimum input voltage is 4.5 V, but it must exceed output voltage by at least 1 V. For 1.5 V output, VIN must be ≥2.5 V; however, the device is not characterized or guaranteed below 4.5 V, and startup may fail due to insufficient gate drive headroom for internal MOSFETs.

How is thermal performance affected by PCB layout?

Thermal resistance drops significantly when the exposed thermal pad (Pin 16) is soldered to ≥4 cm² of inner-layer copper pour with ≥6 thermal vias. Without proper pad connection, junction temperature can exceed 150°C at 2 A load even at 25°C ambient - triggering OTP shutdown.

Does MEZD72402A-C support remote sensing?

No - it lacks dedicated sense pins and uses single-point output feedback. Output voltage regulation is referenced to the VOUT pin, so PCB trace IR drop between module and load causes proportional error. For loads >10 cm away, add local bulk capacitance and minimize trace length.

What is the recommended input capacitor for MEZD72402A-C?

MPS specifies a 0.22 µF X5R ceramic capacitor (0402) placed within 2 mm of VIN and GND pins, plus a 4.7 µF X7R (1206) for mid-frequency filtering. Total input capacitance should be ≥5 µF with ≤10 mΩ ESL to suppress high di/dt transients from the internal switch node.

Is there an enable pin or power-good signal?

No - MEZD72402A-C has no EN or PG pin. It starts up automatically when VIN exceeds UVLO threshold (~4.2 V). Output voltage ramp is controlled internally (0.75 ms typical), and no external sequencing or monitoring signals are provided.