Monolithic Power Systems Inc. MEZD41503A-B

Overview

MEZD41503A-B from Monolithic Power Systems is a ready-to-use, fixed-frequency boost DC-DC power module integrating the MP3429 controller, 1.5µH inductor, and full passive BOM. It delivers 12V at 3A from 3.7–10V input, achieves ≤80mV output ripple at full load, and features over-temperature protection at 150°C. Used in industrial HMIs requiring compact 12V rail generation from wide-input battery or adapter sources.

For engineers reviewing the MEZD41503A-B datasheet, MEZD41503A-B pinout, MEZD41503A-B application, or MEZD41503A-B equivalent, key selection criteria include input voltage range (3.7–10V), regulated 12V output accuracy (±2.2%), 600kHz switching frequency, thermal derating behavior, and compatibility with MP3429-based custom designs.

Technical Context

The MEZD41503A-B implements a synchronous boost topology using the MP3429 QFN-16 controller IC, operating at a fixed 600kHz switching frequency with internal compensation. It supports output voltages of 5V or 12V via external resistor dividers (R2/R3) and includes dedicated OLIM, MODE, EN, and SS pins for current limit setting, mode selection, enable control, and soft-start configuration.

Thermal management relies on copper pour and the integrated 1.5µH/19A inductor with 3.3mΩ DCR. Protection functions include over-temperature shutdown at 150°C and no short-circuit tolerance-output must be externally safeguarded. Efficiency peaks at 97.2% under 6.6V→12V/3A conditions.

Key Specifications

Pinout & Package

MEZD41503A-B is a 6-pin through-hole module (2.54mm pitch) with dual-pad VIN, GND, and VOUT terminals for high-current routing. No IC-level package; board-level mechanical outline measures 22.0 × 18.0 × 7.5 mm (L×W×H).

Key Features

Applications

Availability

MEZD41503A-B is available at Aetrix Electronics and suitable for industrial HMIs, portable test equipment, smart sensor hubs, and POS terminal peripherals requiring stable component supply with documented thermal performance and open-source design files.

Supply support for MEZD41503A-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, and automotive applications.

The mEZD series delivers pre-validated, open-design DC-DC power modules targeting rapid prototyping and production deployment of efficient, thermally robust step-up supplies in space-constrained systems.

FAQ

What input voltage range does the MEZD41503A-B support?

The MEZD41503A-B operates from 3.7V to 10V DC input. This range accommodates fully charged 2S Li-ion batteries (up to 8.4V), 9V wall adapters, and USB-C PD sources. Input below 3.7V will cause dropout; operation above 10V risks damage to the integrated MP3429 controller.

Can the output voltage be adjusted to 5V instead of 12V?

No - the MEZD41503A-B is factory-configured for 12V output using specific R2/R3 resistor values (187kΩ/3kΩ). The mEZD41503A-A variant is configured for 5V. To change output voltage, a different mEZD41503A-X variant or a custom MP3429-based design is required.

Does this module include short-circuit protection?

No - the datasheet explicitly states "No output short allowed." The MEZD41503A-B lacks active short-circuit protection. External current limiting (e.g., polyfuse or electronic fuse) must be added in series with VOUT to prevent damage during fault conditions.

What is the thermal performance under full 3A load?

At 3A output and 85°C ambient, the MEZD41503A-B maintains safe operation with natural convection cooling when mounted per the reference layout. Derating begins above 60°C ambient; full 3A is guaranteed only up to 85°C case temperature, with OTP triggering at 150°C junction.

Is the MP3429 controller accessible for custom configuration?

Yes - the MP3429's EN, SS, MODE, OLIM, COMP, and FB pins are brought out to test points on the board. Users can modify soft-start timing, current limit, and operating mode using external components, as detailed in the MP3429 datasheet and mEZD41503A-X reference design.

What is the end-of-life status of this part?

The mEZD41503A-X family is marked "END OF LIFE, REFER TO MP3429" in the documentation. MEZD41503A-B remains available through Aetrix Electronics for legacy design support and existing production, but new designs should evaluate the MP3429 IC with updated reference layouts.