Monolithic Power Systems Inc. MEZD41502A-B

Overview

MEZD41502A-B from Monolithic Power Systems is a ready-to-use, fixed-frequency boost DC-DC power module delivering 12 V at up to 2 A from a 2.7–10 V input. It integrates the MP3429 controller, power inductor, and full passive BOM in a compact board format, designed for space-constrained industrial and portable systems requiring stable 12 V rail generation from single-cell Li-ion or multi-cell alkaline sources.

For engineers reviewing the MEZD41502A-B datasheet, MEZD41502A-B pinout, MEZD41502A-B application, or MEZD41502A-B equivalent, key selection criteria include its 600 kHz switching frequency, ±2.2% output voltage accuracy, 97.4% peak efficiency at 12 V/2 A, short-circuit protection behavior, and thermal shutdown at 150°C - all validated under natural convection cooling.

Technical Context

The MEZD41502A-B implements a synchronous boost topology using the MP3429 QFN-16 controller IC with integrated gate drivers and current-mode control. Its fixed 600 kHz switching frequency enables predictable EMI filtering and compact external component sizing, while the internal compensation network eliminates loop tuning effort.

Output voltage is set via external resistor dividers (R2 = 68 kΩ, R3 = 10 kΩ for 12 V), and regulation maintains ±0.3% line and ±0.5% load variation across full operating range. No output short-circuit tolerance is specified - sustained shorting triggers overcurrent latch-off.

Key Specifications

Pinout & Package

MEZD41502A-B is supplied as a 6-pin through-hole board-level module (not an IC package). Physical dimensions and mounting match standard 2.54 mm pitch headers. Input and output terminals are duplicated for current sharing and low-impedance connection.

Key Features

Applications

Availability

MEZD41502A-B is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, IoT gateway power stages, and test & measurement probe supplies requiring stable component supply and rapid prototyping support.

Supply support for MEZD41502A-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, automotive, and consumer applications.

The mEZD series delivers fully assembled, tested, and characterized DC-DC power modules targeting engineers needing turnkey power solutions without layout or validation overhead.

FAQ

Is MEZD41502A-B a drop-in replacement for MEZD41502A-A or MEZD41502A-C?

No. While pin-compatible and mechanically identical, MEZD41502A-B uses different feedback resistors (R2 = 68 kΩ, R3 = 10 kΩ) to set 12 V output and is optimized for 2.7–10 V input. MEZD41502A-A targets 2.7–4.2 V/5 V, and MEZD41502A-C targets 3.4–13 V/15 V. Swapping requires verifying input source compatibility and load transient response.

Does MEZD41502A-B support output short-circuit protection?

No. The datasheet explicitly states "No output short allowed" and confirms no automatic recovery or hiccup mode. Sustained short-circuit causes immediate shutdown and requires power cycle to restore operation. External fuse or e-fuse is recommended for system-level protection.

Can MEZD41502A-B be used with forced-air cooling to exceed 2 A?

No. The 2 A rating is validated under natural convection only. Although thermal derating curves show improved power handling with airflow, the module lacks thermal pads or exposed copper for heatsink attachment, and no forced-air test data is published. Exceeding 2 A risks OTP activation or long-term reliability degradation.

What is the role of the NC pins R6 and R7 on the board?

R6 and R7 are unpopulated (NC) resistor locations reserved for optional external compensation or soft-start adjustment. They are not required for standard operation. The module uses internal compensation tuned for the default 12 V configuration; adding components here may destabilize regulation unless re-characterized per MP3429 datasheet guidelines.

Is the MP3429 controller accessible for firmware control or monitoring?

No. The MP3429 inside MEZD41502A-B operates in fixed-function mode with no exposed communication interface (I²C, SPI, or PMBus). Pins like SS (soft-start), MODE (PWM/PFM), and COMP (compensation) are internally connected or terminated. Only VIN, GND, and VOUT are user-accessible.

How does MEZD41502A-B compare to the end-of-life-recommended MP3429 IC?

MEZD41502A-B is a complete module integrating MP3429, inductor, and passives; MP3429 is just the controller IC requiring external FETs, inductor, and compensation. MEZD41502A-B saves ~12 weeks of power stage design/validation but offers no configurability. MP3429 allows adjustable frequency, PFM mode, and external current sensing - critical for custom topologies.