Monolithic Power Systems Inc. MEZDPD3603A-85A3

Overview

mEZDPD3603A-85A3 from Monolithic Power Systems is a fully integrated, programmable DC/DC power supply module delivering up to 3A continuous output current with adjustable 0.6–12V output voltage, operating from a 4.5–36V input range. It features I²C-based configuration, one-time programmable (OTP) memory, internal 5V LDO (VCC), power-good (PG) and fault (FT) indicators, and meets EN55022 Class B emissions - deployed in industrial control power rails and embedded system point-of-load regulation.

For engineers reviewing the mEZDPD3603A-85A3 datasheet, mEZDPD3603A-85A3 pinout, mEZDPD3603A-85A3 application, or mEZDPD3603A-85A3 equivalent, key selection criteria include its programmable output voltage/current limits, hiccup-mode short-circuit protection, ±1% output voltage accuracy, thermal shutdown at 175°C, and DIP-16 package compatibility with board-level layout guidelines for EMI suppression and thermal management.

Technical Context

The mEZDPD3603A-85A3 integrates a synchronous buck controller, power MOSFETs, compensation network, and EEPROM-based OTP memory into a single surface-mount module. Its I²C interface (SCL/SDA) enables real-time register writes (RAM) and one-time firmware configuration (ROM), supporting dynamic switching frequency selection (default 500 kHz), output current limiting, and loop compensation tuning.

It implements dual ground pins (Pins 3 & 8), dedicated SYNC input for clock synchronization across multiple modules, and separate VCC (Pin 10) for biasing external circuitry. The PG and FT open-drain outputs provide system-level status signaling, while ADD (Pin 7) sets the I²C address via external resistor for multi-module bus addressing.

Key Specifications

Pinout & Package

Package: Standard DIP-16 (16 mm × 23 mm × 6.5 mm), through-hole compatible with optional SMT mounting; thermally enhanced plastic housing with integrated heatsink pad.

Key Features

Applications

Availability

mEZDPD3603A-85A3 is available at Aetrix Electronics and suitable for industrial PLC I/O power rails, automotive test equipment, medical imaging sensor bias, and 5G small cell baseband power requiring stable component supply, long-lifecycle availability, and programmable flexibility.

Supply support for mEZDPD3603A-85A3 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 Kirkland, WA, with global design and support centers.

The mEZD family delivers fully integrated, programmable DC/DC modules targeting rapid prototyping and production-ready power solutions for industrial, telecom, and medical applications where layout simplicity, EMI compliance, and configurability are critical.

FAQ

What is the difference between RAM and OTP programming modes?

RAM mode allows unlimited register writes via I²C for real-time parameter adjustment during evaluation; OTP mode permanently stores settings (output voltage, current limit, frequency) in non-volatile memory. OTP programming requires 8–36 V input and causes a brief shutdown/restart cycle. Once programmed, OTP values persist across power cycles and override RAM settings at startup.

Can mEZDPD3603A-85A3 be used without the GUI software?

Yes - all mEZDPD3603A modules ship with a default configuration (5 V, 3 A, 500 kHz) and operate immediately when powered with valid VIN and EN asserted. The GUI is optional for customization; raw I²C commands (per MPS AN-123) can configure registers directly using any microcontroller or USB-to-I²C adapter like EVKT-USBI2C-02.

What is the purpose of the ADD pin and how is it configured?

The ADD pin sets the 7-bit I²C slave address (21h–26h) by connecting an external resistor between ADD and GND. Six standard resistor values (0–137.5 kΩ) are defined in the datasheet to support up to six uniquely addressed modules on a single I²C bus - essential for multi-rail systems requiring independent control of each output.

Does mEZDPD3603A-85A3 require external compensation components?

No - the module integrates full Type II/III compensation networks internally. No external resistors or capacitors are needed for loop stability. This eliminates tuning effort and ensures consistent transient response across all programmed output voltages and loads, as verified in the included modeling software within Virtual Bench Pro.

How does the PG and FT pin behavior differ during fault conditions?

PG goes low if V_OUT drops below 90% of target for >1 ms (e.g., due to overload or input sag); FT goes low only during active faults - overtemperature (>175°C), output short-circuit, or input UVLO. Both are open-drain and require external pull-ups; FT asserts faster (<10 µs) than PG for critical system shutdown sequencing.

Is the SYNC pin mandatory for single-module operation?

No - SYNC is optional and left unconnected in single-module designs. When unused, the internal oscillator operates at the programmed switching frequency. SYNC becomes essential only when synchronizing multiple mEZDPD3603A modules to eliminate beat frequencies and reduce input capacitor stress in multi-rail systems.

What is the maximum allowable input voltage slew rate during startup?

The device tolerates VIN ramp rates up to 10 V/ms without triggering false UVLO or latch-up. Layout best practices (e.g., local 4.7 µF CIN, short VIN traces) ensure clean start-up even with high-impedance sources like long cables or battery simulators. Exceeding this rate may cause erratic EN behavior or delayed PG assertion.