Monolithic Power Systems Inc. MEZDPD3603A-84DD

Overview

mEZDPD3603A-84DD from Monolithic Power Systems is a programmable, fully integrated DC/DC power supply module delivering up to 3A continuous output current with adjustable output voltage from 0.6V to 12V, operating from a 4.5–36V input range. It features I²C-based configuration, one-time programmable (OTP) memory, and built-in protection including hiccup-mode short-circuit and over-temperature shutdown at 175°C. It is deployed in industrial control systems requiring field-configurable, EN55022 Class B-compliant power rails.

For engineers reviewing the mEZDPD3603A-84DD datasheet, mEZDPD3603A-84DD pinout, mEZDPD3603A-84DD application, or mEZDPD3603A-84DD equivalent, this module supports rapid bench evaluation via USB-to-I²C interface, real-time register tuning, OTP configuration lock-in, and thermal-aware layout per four-layer PCB guidelines.

Technical Context

The mEZDPD3603A-84DD integrates a synchronous buck controller, power MOSFETs, compensation network, and internal 5V LDO (VCC) into a single DIP package. Its I²C interface enables dynamic adjustment of output voltage, current limit, switching frequency (typ. 500 kHz), and protection thresholds without hardware changes.

It implements digital fault management with dedicated FT̅ (open-drain fault indicator) and PG (power-good) signals, and supports multi-module addressing via external resistor on ADD pin. The SYNC input allows clock synchronization across multiple modules to reduce EMI.

Key Specifications

Pinout & Package

Package: Standard DIP (16 mm × 23 mm × 6.5 mm), surface-mount, fully encapsulated module with exposed thermal pad on bottom.

Key Features

Applications

Availability

mEZDPD3603A-84DD is available at Aetrix Electronics and suitable for industrial PLC I/O modules, factory automation controllers, test & measurement equipment, and programmable logic controller backplanes requiring stable component supply, field-programmable flexibility, and long-term lifecycle support.

Supply support for mEZDPD3603A-84DD 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 California and serving global industrial, automotive, and computing markets since 1997.

The mEZD family delivers fully integrated, programmable DC/DC power modules targeting rapid prototyping and production-ready power solutions for space-constrained, thermally demanding industrial applications.

FAQ

What is the difference between OTP and RAM programming modes?

In OTP mode, configuration values (output voltage, current limit, switching frequency) are written once to non-volatile memory and persist after power loss. In RAM mode, settings are stored in volatile registers and require reprogramming at each power-on. RAM mode supports unlimited writes for development; OTP mode ensures configuration security and repeatability in production.

Can mEZDPD3603A-84DD operate without external I²C communication?

Yes. Units shipped with default configuration (e.g., mEZDPD3603A-0001) deliver 5 V at 3 A immediately upon enabling EN, with no I²C required. All programmable parameters retain factory defaults unless explicitly modified via GUI or register write.

How is thermal performance managed in the DIP package?

The module uses an exposed thermal pad on the bottom side, designed for direct soldering to a large internal or bottom-layer copper pour. Layout guidelines specify four-layer PCB construction, multiple thermal vias, and minimized high-current trace lengths to maintain case temperature rise ≤60°C at full load and 85°C ambient.

Does mEZDPD3603A-84DD support parallel operation for higher current?

No. The device does not include current-sharing circuitry or master/slave synchronization beyond clock alignment via SYNC. Parallel operation is not supported or characterized; for >3 A, use a higher-current module such as mEZD81260A.

What external components are mandatory for basic operation?

Mandatory components include: one 4.7 µF ceramic input capacitor (CIN) placed within 5 mm of VIN/GND pins; two 22 µF X7R output capacitors (COUT) placed adjacent to VOUT/GND; and a 1 µF ceramic capacitor on VCC. No inductor or feedback resistors are required-the module is fully integrated.

Is EN55022 Class B compliance verified with specific layout?

Yes. Class B emissions compliance is validated using the reference layout in the datasheet (four-layer PCB, specified capacitor placement, and recommended input filter with FB1 bead). Deviations-especially in ground plane integrity or input capacitor location-may degrade EMI performance and invalidate certification.

What failure conditions trigger the FT̅ pin assertion?

FT̅ asserts low during detected overcurrent (exceeding programmed limit), overtemperature (>175°C die temperature), input undervoltage lockout (VIN < ~4.2 V), or internal fault (e.g., VCC regulator failure). It remains asserted until fault clears and device resets, either automatically after hiccup timeout or via EN toggle.