Monolithic Power Systems Inc. MEZD72402A-E

Overview

MEZD72402A-E from Monolithic Power Systems is a ready-to-use, synchronous step-down DC/DC power supply module delivering 2 A at 2.5 V output from a 4.5–36 V input. It integrates MOSFETs, controller, and compensation 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 for industrial power rails.

For engineers reviewing the MEZD72402A-E datasheet, MEZD72402A-E pinout, MEZD72402A-E application, or MEZD72402A-E equivalent, key selection criteria include its fixed 2.5 V output option (E suffix), 400 kHz switching frequency, 26.4 mV output ripple at 24 V_IN/3.3 V_OUT/full load, hiccup-mode fault response, and EOL status requiring migration planning to MPM3530.

Technical Context

The MEZD72402A-E implements a current-mode synchronous buck topology with integrated high- and low-side MOSFETs, enabling regulated 2.5 V output without external gate drivers. Its internal compensation network eliminates need for external loop components, and EN pin enables precise system-level power sequencing.

It employs thermal shutdown at 150°C (OTP) and hiccup-mode recovery after short-circuit events, with line regulation of ±1% over full input range and load regulation of ±1% from no-load to 2 A. Input voltage must exceed output by ≥1 V for stable operation.

Key Specifications

Pinout & Package

Package: QFN-16 (4 mm × 4 mm, 0.5 mm pitch), exposed thermal pad, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MEZD72402A-E, MPM3530 offers higher current headroom and modern thermal performance, while LMZ36002 provides vendor-diversity but sacrifices hiccup-mode fault recovery-making MPM3530 the recommended migration path per MPS documentation.

Availability

MEZD72402A-E is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and medical diagnostic sensors requiring stable component supply despite end-of-life status.

Supply support for MEZD72402A-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, automotive, and computing markets.

The mEZD72402A series was designed as a plug-and-play DC/DC power module family targeting rapid prototyping and cost-sensitive production of 2 A POL supplies with minimal external components.

FAQ

Is MEZD72402A-E still in production?

No. MEZD72402A-E is officially End-of-Life per MPS documentation dated February 2018. It is superseded by MPM3530, which offers enhanced current capability, efficiency, and thermal performance. Aetrix Electronics maintains limited legacy stock for last-time buys and migration support.

What is the function of the EN pin on MEZD72402A-E?

The EN (Enable) pin is not present on the MEZD72402A-E module. Unlike the DIY variant (DIY72402-AX), the mEZD72402A-E is a fully integrated, ready-to-use module with no external enable control - it powers up automatically when valid input voltage is applied within specification.

Can MEZD72402A-E operate with 5 V input?

No. The minimum input voltage is 4.5 V, but operation at 5 V is invalid because the device requires VIN ≥ VOUT + 1 V. With a fixed 2.5 V output, minimum valid input is 3.5 V - however, the datasheet specifies 4.5 V absolute minimum due to internal bias and startup margin requirements.

Does MEZD72402A-E require external compensation components?

No. The MEZD72402A-E integrates full internal compensation. No external capacitors or resistors are needed for loop stability - this is confirmed in the "Typical Application Circuit" and "Open Design Files" sections of the official Rev. 1.4 datasheet.

What is the thermal pad connection requirement for QFN-16 mounting?

The exposed thermal pad (Pin 16) must be soldered to a dedicated PCB copper pour connected to GND. Minimum recommended solder stencil aperture is 80% open area; thermal vias (≥6×0.3 mm) beneath the pad are required to achieve specified 85°C ambient operation at full 2 A load.

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

Upon short-circuit detection, MEZD72402A-E disables switching, waits ~500 ms, then attempts restart. If fault persists, it repeats the cycle indefinitely - limiting average power dissipation to <1 W and preventing thermal damage without requiring external reset circuitry.

Is the 2.5 V output trimmed at final test?

Yes. The E-suffix denotes factory-trimmed 2.5 V output with ±2.5% accuracy over temperature and line/load conditions. This is achieved via laser trimming of internal feedback divider, eliminating need for external resistor networks or post-assembly calibration.