Monolithic Power Systems Inc. MEZD71202A-G

Overview

MEZD71202A-G from Monolithic Power Systems is a 2A, synchronous step-down DC/DC power supply module with 4.5–24V input and fixed 5.0V output, housed in an FCQFN3x3-16 package. It integrates MOSFETs, controller, and compensation, supports hiccup-mode short-circuit protection, ±2.5% output voltage accuracy, and delivers up to 95% efficiency at 3.3V/2A under 12V input - used in industrial I/O modules requiring compact, regulated 5V rails.

For engineers reviewing the MEZD71202A-G datasheet, MEZD71202A-G pinout, MEZD71202A-G application, or MEZD71202A-G equivalent, key selection criteria include input voltage range (4.5–24V), guaranteed 2A continuous output, thermal shutdown at 150°C, hiccup-mode fault recovery, and compatibility with standard 0402/0805/1206 passives in DIY layout.

Technical Context

The MEZD71202A-G implements a constant-on-time (COT) control architecture enabling fast transient response and stable operation without external compensation. It integrates high- and low-side power MOSFETs, internal LDO for VCC bias, and a precision bandgap reference for output regulation.

Its FCQFN3x3-16 package features exposed thermal pad for PCB heat sinking, and the EN pin enables precise power sequencing via logic-level enable/disable. The PGND/AGND separation supports noise-sensitive analog load interfacing while maintaining robust switching performance.

Key Specifications

Pinout & Package

MEZD71202A-G is packaged in FCQFN3x3-16 with wettable flank leads and an exposed thermal pad (Pin 16). The package measures 3.0mm × 3.0mm × 1.0mm and requires solder paste stencil design per IPC-7527 for reliable reflow.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 2A fixed-output DC/DC module applications.

Compared with MEZD71202A-G, MPM3530GQV offers higher current, integrated magnetics, and extended temperature rating but requires layout revision; TSM12020S provides drop-in voltage compatibility at the cost of thermal performance and package size - neither matches the original's 24V input capability or hiccup-mode reliability.

Availability

MEZD71202A-G is available at Aetrix Electronics and suitable for industrial I/O modules, factory automation sensor hubs, embedded HMI controllers, and medical diagnostic peripherals requiring stable component supply despite its end-of-life status.

Supply support for MEZD71202A-G 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, automotive, and consumer markets.

The mEZD71202A series was designed as a ready-to-use, open-layout DC/DC module family targeting rapid prototyping and low-risk production deployment of 1–5V, 1–3A point-of-load supplies in space-constrained industrial edge devices.

FAQ

Is MEZD71202A-G still in production?

No - MEZD71202A-G is officially end-of-life per Monolithic Power Systems' notification. Aetrix Electronics holds remaining authorized inventory and supports legacy design continuity through controlled distribution and cross-reference guidance to MPM3530GQV.

What is the recommended replacement for MEZD71202A-G?

The MPM3530GQV is the direct, pin-compatible successor from MPS. It supports 4.5–18V input, delivers 5V/3A, integrates the power inductor, and operates from –40°C to +125°C - requiring only minor PCB layout updates for the smaller 3.0×3.0mm footprint and revised thermal pad pattern.

Does MEZD71202A-G require external feedback resistors?

No - MEZD71202A-G-G has a factory-trimmed internal feedback network for 5.0V output. No external resistors are needed, simplifying layout and eliminating tolerance drift from external components. Output voltage cannot be adjusted.

Can MEZD71202A-G operate at 24V input continuously?

Yes - the device is rated for continuous operation across its full 4.5–24V input range. At 24V input and 5V/2A output, efficiency drops to ~87%, and thermal management becomes critical; minimum 100mm² copper pour under the thermal pad is mandatory for safe operation at full load.

What is the purpose of the NC pins (4–15)?

Pins 4 through 15 are not electrically connected internally and serve only mechanical functions - providing structural rigidity and solder joint reliability. They must remain unconnected in the schematic and may be tied to ground on the PCB solely for mechanical anchoring, per MPS layout guidelines.

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

Under sustained short-circuit conditions, MEZD71202A-G cycles between 100ms off-time and brief on-pulse attempts. This limits average power dissipation to <1W, preventing thermal damage while allowing automatic recovery once the fault is removed - unlike latch-off protection which requires power cycle reset.

Is the thermal pad (Pin 16) electrically connected to ground?

Yes - the exposed thermal pad is internally connected to PGND. It must be soldered to a dedicated, low-impedance PCB ground plane with ≥6 thermal vias (0.3mm diameter) to ensure both thermal performance and electrical integrity for the power ground return path.