Monolithic Power Systems Inc. MEZD41503A-A

Overview

MEZD41503A-A from Monolithic Power Systems is a ready-to-use, fixed-frequency boost DC-DC power module delivering 5 V at up to 3 A from a 2.7–4.2 V input. It integrates the MP3429 controller, power inductor, and full passive BOM in a compact board format. Designed for single-rail voltage boosting in portable USB-powered systems and low-voltage battery interfaces.

For engineers reviewing the MEZD41503A-A datasheet, MEZD41503A-A pinout, MEZD41503A-A application, or MEZD41503A-A equivalent, key selection criteria include its 5 V output accuracy (±2.2%), 37 mV typical ripple at 3.3 V→5 V/3 A, 96.7% peak efficiency, 600 kHz switching frequency, and integrated over-temperature protection at 150 °C.

Technical Context

The MEZD41503A-A implements a synchronous boost topology using the MP3429 QFN-16 controller IC with internal MOSFET drivers and fixed 600 kHz oscillator. It supports only 5 V output (A variant), unlike the B variant's 12 V option, and requires no external compensation due to factory-tuned loop stability.

Input range is strictly limited to 2.7–4.2 V - optimized for single-cell Li-ion/Li-polymer sources. Output regulation uses resistive feedback (R2/R3) tied to the FB pin of the MP3429, with ±0.2% line and ±0.5% load regulation confirmed across full operating conditions.

Key Specifications

Availability

MEZD41503A-A is available at Aetrix Electronics and suitable for portable medical monitors, USB-C power adapters, and handheld test equipment requiring stable component supply with pre-validated performance and minimal layout risk.

Supply support for MEZD41503A-A 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 integrated power modules for industrial, computing, and consumer applications.

The mEZD series delivers fully assembled, tested, and documented DC-DC boost modules targeting rapid prototyping and low-risk production integration where time-to-market and layout reliability are critical.

FAQ

What input voltage range is supported by the MEZD41503A-A?

The MEZD41503A-A accepts 2.7 V to 4.2 V DC input only - specifically engineered for single-cell lithium-based batteries. Operation outside this range may cause malfunction or damage. It does not support inputs above 4.2 V, unlike the MEZD41503A-B variant (3.7–10 V).

Can the output voltage be adjusted to 12 V?

No. The MEZD41503A-A is factory-configured for 5 V output only, using fixed resistor values (R2 = 187 kΩ, R3 = 3 kΩ). To obtain 12 V, use the MEZD41503A-B variant, which uses different feedback resistors (R2 = 68 kΩ, R3 = 10 kΩ) and supports 3.7–10 V input.

Is short-circuit protection implemented on this module?

The MEZD41503A-A does not include automatic short-circuit recovery or hiccup-mode protection. The datasheet explicitly states "No output short allowed." Sustained output shorts will trigger over-temperature shutdown but may cause irreversible damage without external current limiting.

What is the thermal performance under full 3 A load?

At 3 A output and 3.3 V input, the module reaches ~75 °C case temperature under natural convection at 25 °C ambient. Derating begins above 60 °C ambient per the published power derating curve; forced airflow or heatsinking extends full-load capability.

Does this module require external components for basic operation?

No. The MEZD41503A-A is a complete, ready-to-use solution: all passives, the MP3429 controller, and the 1.5 µH power inductor are integrated onto the PCB. Only input and output capacitors (already mounted) and connectors are needed - no additional ICs, resistors, or layout effort required.

What is the recommended replacement since this part is end-of-life?

MPS officially designates MP3429GL as the functional replacement IC. For module-level replacement, engineers should evaluate the MPQ3429-AEC1-based reference designs or contact MPS for updated mEZ variants. Aetrix can support transition with cross-reference analysis and sample availability.