Monolithic Power Systems Inc. MEZD72401A-B

Overview

MEZD72401A-B from Monolithic Power Systems is a ready-to-use, 1A synchronous step-down DC/DC power supply module with fixed 1.2V output, 4.5–36V input range, ±2.5% output voltage accuracy, 400kHz switching frequency, and hiccup-mode short-circuit protection. It integrates power MOSFETs, controller, and compensation, targeting industrial control rails and embedded microcontroller core supplies.

For engineers reviewing the MEZD72401A-B datasheet, MEZD72401A-B pinout, MEZD72401A-B application, or MEZD72401A-B equivalent, key selection factors include its fixed-output configuration, thermal derating behavior up to 125°C ambient, integrated over-temperature (150°C trip) and over-current protection, and compatibility with standard 0805/1206 passive footprints in DIY layouts.

Technical Context

The MEZD72401A-B implements a constant-on-time (COT) control architecture enabling fast transient response without external loop compensation. Its internal synchronous rectification eliminates external Schottky diode requirements and achieves >90% peak efficiency at 24V_IN/3.3V_OUT.

It operates across -40°C to +85°C ambient with built-in OTP (150°C), hiccup-mode short-circuit protection, and line/load regulation of ±1% (typ.) under full load. Input voltage must exceed output by ≥1V for stable operation.

Key Specifications

Availability

MEZD72401A-B is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, medical sensor signal conditioning, and edge AI inference accelerators requiring stable component supply during legacy design support phases.

Supply support for MEZD72401A-B 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, and automotive applications.

The mEZD72401A series was designed as an integrated, board-level DC/DC solution to reduce layout complexity and accelerate time-to-power for space-constrained embedded systems using fixed-output configurations.

FAQ

Is MEZD72401A-B still in active production?

No - MEZD72401A-B is End-of-Life (EOL) per Monolithic Power Systems' official notice. It is superseded by the MPM3530, which offers improved efficiency, smaller QFN-16 package, and extended temperature range. Aetrix Electronics maintains limited legacy stock for last-time buys and repair fulfillment.

What are the physical dimensions and mounting requirements?

The MEZD72401A-B module measures 12.2mm × 12.2mm × 4.4mm (L×W×H) with a 3-pin through-hole footprint (VIN, GND, VOUT). It requires no heatsink under natural convection at ≤1A load and 25°C ambient; thermal derating begins above 85°C ambient per published curves.

Can the output voltage be adjusted externally?

No - MEZD72401A-B is a fixed-output variant (1.2V). The 'B' suffix denotes factory-trimmed 1.2V; other variants (e.g., 'F' = 3.3V, 'G' = 5.0V) are discrete part numbers. Adjustable versions are not offered in the mEZD72401A series.

Does it require external components to operate?

Yes - minimal external components are required: input capacitor (≥2.2µF ceramic), output capacitor (≥22µF ceramic), and optional enable pull-up resistor. The BOM lists exact values and footprints (0402, 0805, 1206) for DIY implementation; Gerber files are available from MPS upon request.

How does hiccup-mode short-circuit protection behave?

Upon sustained short-circuit, the device shuts down output, waits ~500ms, then attempts soft-start recovery. This cycle repeats until fault clears. It prevents thermal runaway and enables automatic system recovery without manual reset or power cycling.

What is the calculated MTBF and reliability data?

MEZD72401A-B has a calculated MTBF of 4185 × 10³ hours per MIL-HDBK-217F (ground benign environment). FIT rate is 0.24. No accelerated life test reports or burn-in data are published; reliability is based on Monolithic Power's internal qualification per JEDEC JESD47.