Monolithic Power Systems Inc. MEZD71201A-E

Overview

MEZD71201A-E from Monolithic Power Systems is a 1A, synchronous step-down DC/DC power supply module with fixed 2.5V output, 4.5–24V input range, ±2.5% output voltage accuracy, 400kHz switching frequency, and hiccup-mode short-circuit protection. It integrates power MOSFETs, inductor, and compensation circuitry, targeting space-constrained industrial and embedded power rails.

For engineers reviewing the MEZD71201A-E datasheet, MEZD71201A-E pinout, MEZD71201A-E application, or MEZD71201A-E equivalent, key selection factors include its integrated inductor, thermal shutdown at 150°C, -40°C to +85°C operating range, load regulation of ±1% (typ.), and EOL status requiring migration planning to MPM3530.

Technical Context

The MEZD71201A-E implements a current-mode controlled synchronous buck topology with internal high- and low-side MOSFETs, enabling efficient conversion across its 4.5–24V input range. It delivers regulated 2.5V output with 1A continuous current capability and supports external enable control via EN pin.

Its hiccup-mode short-circuit protection disables switching during fault conditions and auto-recovers after cooldown, while over-temperature protection triggers at 150°C. The module uses an FCQFN3x3-16 package with exposed thermal pad for enhanced heat dissipation.

Key Specifications

Pinout & Package

FCQFN3x3-16 package with wettable flank leads and exposed thermal pad (pin 16). Dimensions: 3.0mm × 3.0mm × 1.8mm. Thermal pad must be soldered to PCB ground plane for rated performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPM3530, MEZD71201A-E offers lower cost and simpler integration for fixed 2.5V/1A needs, while TSM10502 trades integration for input voltage headroom - both require revalidation of thermal and EMI performance in existing layouts.

Availability

MEZD71201A-E is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, automotive body electronics, and embedded computing applications requiring stable component supply despite end-of-life status.

Supply support for MEZD71201A-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, headquartered in Kirkland, WA.

The mEZD71201A series belongs to MPS's integrated power module product line, designed specifically for rapid deployment of compact, reliable DC/DC solutions in space- and time-constrained industrial and embedded systems.

FAQ

Is MEZD71201A-E still in active production?

No. MEZD71201A-E is officially End-of-Life (EOL) per Monolithic Power Systems' notification. Production ceased as of Rev. 1.6 (July 2019), and MPM3530 is designated as the recommended migration path. Aetrix Electronics maintains limited legacy stock with full traceability for last-time buys.

What is the thermal pad connection requirement for MEZD71201A-E?

The exposed thermal pad (pin 16) must be soldered to a dedicated PCB copper pour connected to system ground. Minimum recommended pad size is 3.0mm × 3.0mm with ≥4 thermal vias (0.3mm diameter) to inner ground layers. Failure to implement this results in thermal derating beyond published curves and potential OTP activation.

Can MEZD71201A-E operate with input voltage below 4.5V?

No. Absolute minimum input voltage is 4.5V. Operation below this threshold causes undervoltage lockout (UVLO) activation, disabling switching. The device will not regulate or deliver output current until VIN exceeds 4.5V with sufficient slew rate (>1V/ms) to avoid false triggering.

Does MEZD71201A-E support remote sensing?

No. MEZD71201A-E lacks dedicated sense pins and relies on local feedback at the VOUT pin. For applications requiring <1% output regulation under high-impedance PCB traces, an external LDO or discrete buck with remote sensing should be evaluated.

What is the startup time from EN assertion to regulated VOUT?

Typical startup time is 0.75ms (measured from 10% to 90% of 2.5V), consistent across input voltages from 4.5V to 24V. This value includes internal soft-start ramp and feedback loop stabilization; no external timing components are required or supported.

Are Gerber files and BOM publicly available for MEZD71201A-E?

Yes. MPS provides open design files including Gerber, BOM, and schematic for the DIY71201-AX reference layout. These are accessible via direct request to [email protected] and are intended for customer validation and derivative board development.

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

Upon short-circuit detection, MEZD71201A-E disables switching, waits ~500ms, then attempts restart. If fault persists, it repeats the cycle indefinitely. Average output current during hiccup is <5mA, limiting self-heating and enabling safe operation until fault removal without manual reset.