Monolithic Power Systems Inc. MEZD71202A-E

Overview

MEZD71202A-E from Monolithic Power Systems is a 2A, synchronous step-down DC/DC power supply module with 4.5–24V input and fixed 2.5V output, integrated inductor, FCQFN3x3-16 package, ±2.5% output voltage accuracy, and hiccup-mode short-circuit protection. It delivers regulated power for FPGA I/O banks, industrial PLC logic rails, and embedded microcontroller core supplies.

For engineers reviewing the MEZD71202A-E datasheet, MEZD71202A-E pinout, MEZD71202A-E application, or MEZD71202A-E equivalent, key selection criteria include input voltage range (4.5–24V), output current capability (2A continuous), thermal derating behavior above 85°C ambient, and compatibility with 3.3V/5V system-level enable sequencing.

Technical Context

This module integrates a controller, power MOSFETs, and a shielded 3.3µH inductor into a single FCQFN3x3-16 package. It operates at a fixed 400kHz switching frequency and uses internal compensation to simplify layout while maintaining ±1% line and load regulation across full operating conditions.

The device implements over-temperature protection (trip at 150°C), over-current protection with hiccup recovery, and under-voltage lockout (UVLO) with hysteresis. Output voltage is factory-set to 2.5V via internal resistor divider; no external feedback components are required.

Key Specifications

Pinout & Package

FCQFN3x3-16 package with exposed thermal pad; 3.0mm × 3.0mm footprint, 0.5mm pitch, 0.8mm max height. Pin 1 marked by dot; top-side silkscreen indicates VIN, GND, VOUT orientation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down power module applications.

Compared with MEZD71202A-E, MPM3530GQV offers higher current and smaller size but sacrifices input voltage flexibility, while TSM12202S trades integration for broader lifecycle support and thermal robustness in harsh environments.

Availability

MEZD71202A-E is available at Aetrix Electronics and suitable for FPGA I/O banks, industrial PLC logic rails, and embedded microcontroller core supplies requiring stable component supply and rapid prototyping support.

Supply support for MEZD71202A-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, and automotive markets.

The mEZD71202A series targets space-constrained, high-reliability embedded systems needing plug-and-play DC/DC conversion with minimal external components and verified thermal performance.

FAQ

Is MEZD71202A-E still in active production?

No - MEZD71202A-E is End-of-Life (EOL) as stated in the official Monolithic Power Systems documentation. Customers are directed to migrate to the MPM3530 series. Aetrix Electronics maintains limited legacy stock for last-time buys and provides technical migration support for redesign efforts.

What is the recommended input capacitor configuration?

The datasheet specifies a 0.22µF X5R ceramic capacitor (0402) placed adjacent to Pin 1 (VIN), plus a 4.7µF X7R (1206) for mid-frequency filtering. These values are validated for stability across the full 4.5–24V input range and prevent input voltage droop during 2A load transients.

Can MEZD71202A-E be used with an input voltage below 4.5V?

No - the absolute minimum input voltage is 4.5V, and operation below this threshold will cause UVLO activation and output disable. The device requires VIN ≥ VOUT + 1V, so 2.5V output mandates ≥3.5V minimum; however, the specified operational floor remains 4.5V per electrical characteristics table.

Does the thermal pad require solder paste stencil aperture adjustment?

Yes - the exposed thermal pad (Pins 4–16) must be soldered using a 70–80% copper fill stencil aperture to ensure void-free thermal interface. Insufficient paste volume causes elevated junction temperatures and premature OTP triggering under 2A continuous load at 85°C ambient.

What is the purpose of the "DIY" designation in the reference design?

The "DIY" label refers to Monolithic Power's open-design initiative: full Gerber files, BOM, and schematic are provided for customer-modified layouts. This enables custom thermal vias, mechanical cutouts, or mixed-voltage board integration without NDA restrictions.

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

Upon short-circuit detection, MEZD71202A-E disables switching, waits ~500ms, then attempts restart. If the fault persists, it repeats the cycle indefinitely - limiting average power dissipation to <150mW and preventing thermal damage to the internal MOSFETs or inductor.

Is output voltage adjustable via external resistors?

No - MEZD71202A-E has a factory-programmed 2.5V output. The internal feedback divider is trimmed and inaccessible; no external resistor network can modify the setpoint. For adjustable versions, refer to the mEZD71202A-X series with suffixes A–G indicating fixed outputs only.