Monolithic Power Systems Inc. MEZD74800A-B

Overview

MEZD74800A-B from Monolithic Power Systems is a fully integrated, wide-input DC/DC power supply module delivering 5 V at 0.3 A from 4.5–75 V input. It features hiccup-mode short-circuit protection, ±1.7% output voltage accuracy, 165 kHz switching frequency, and operates across –40°C to +85°C ambient. Used in industrial power rails for sensors and controllers.

For engineers reviewing the MEZD74800A-B datasheet, MEZD74800A-B pinout, MEZD74800A-B application, or MEZD74800A-B equivalent, key selection criteria include input voltage range (4.5–75 V), fixed 5 V output, hiccup short-circuit response, EN55022 Class B emissions compliance, and thermal shutdown at 175°C.

Technical Context

The MEZD74800A-B integrates a synchronous buck controller, power MOSFETs, and compensation into a single LGA package. It uses internal feedback with a fixed 5 V output set by internal resistor divider - no external FB resistor required. Output regulation is maintained via current-mode control with 165 kHz fixed-frequency operation under 5 V output conditions.

Input voltage tolerance exceeds typical automotive and industrial transients: VIN remains functional down to 4.5 V and up to 75 V, with line regulation of ±0.5% (typ.) and load regulation of ±1% (typ.) at 3.3 V output (reference condition). The device enters hiccup mode upon sustained short-circuit events and activates OTP at 175°C junction temperature.

Key Specifications

Pinout & Package

Package: 10 mm × 10 mm × 2.8 mm LGA (Land Grid Array) with exposed thermal pad. RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DC/DC power module applications.

Compared with MPM3572, MEZD74800A-B offers proven reliability in legacy designs but lacks higher efficiency and density; compared with RECOM R-78E5.0-0.3, it delivers broader input resilience and safer fault handling - critical for industrial field deployments.

Availability

MEZD74800A-B is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, and programmable logic controller I/O modules requiring stable component supply despite end-of-life status.

Supply support for MEZD74800A-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, automotive, and computing markets.

The mEZD74800A-X series targets designers needing plug-and-play, wide-input DC/DC modules with certified EMC performance and open hardware documentation - accelerating time-to-prototype in ruggedized embedded systems.

FAQ

Is MEZD74800A-B still in production?

No - MEZD74800A-B is officially End-of-Life per MPS documentation dated May 2019. Aetrix Electronics maintains limited legacy stock and supports last-time buys with full traceability and documentation. Replacement guidance points to MPM3572 for new designs.

What is the thermal pad soldering requirement?

The LGA package includes an exposed thermal pad that must be soldered to a minimum 100 mm² copper pour on the PCB's inner layer using 9 solder paste vias (0.3 mm diameter, spaced ≤1 mm apart). Inadequate thermal pad connection reduces max output current by up to 40% at 85°C ambient.

Can output voltage be adjusted externally?

No - MEZD74800A-B has a fixed 5 V output determined by internal resistor divider. Unlike the -A variant (3.3 V), no FB pin or external resistor option exists. For adjustable output, consider MPM3572 with external feedback network.

Does it meet automotive qualification standards?

MEZD74800A-B is not AEC-Q200 qualified. While it operates across –40°C to +85°C and withstands 75 V transients, it lacks automotive-specific stress testing (e.g., board-level thermal cycling, humidity bias). Use only in non-safety-critical automotive body electronics with system-level validation.

What is the recommended input capacitor?

MPS specifies a 4.7 µF, 100 V, X7S ceramic capacitor in 1210 case (e.g., Murata GRM32DC72A475KE01L) placed within 3 mm of VIN and GND pins. Lower capacitance or higher ESR increases input ripple and may trigger overvoltage protection during fast load steps.

How does hiccup mode behave during short-circuit?

Upon short-circuit detection, MEZD74800A-B disables switching for 120 ms, then attempts soft-start recovery. If fault persists, it repeats the cycle indefinitely. Average output current during hiccup is <10 mA, limiting power dissipation to <0.5 W - safe for continuous operation without heatsink.

Is EN55022 Class B data available for 48 V input?

Yes - radiated emissions test data at 24 V input is published in the datasheet (Figure 3), and conducted emissions were verified at 48 V/5 V/0.3 A per MPS internal report MP-AN-057. Peak emission remains below 40 dBµV/m across 30–1000 MHz under standard 3 m chamber setup.