Monolithic Power Systems Inc. MPQ4323GDE-AEC1-Z

Overview

MPQ4323GDE-AEC1-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, synchronous step-down DC/DC converter with integrated 70mΩ high-side and 50mΩ low-side MOSFETs, delivering 3A continuous output current. It operates from 3.3V to 36V input, tolerates 42V automotive load dump, and features 1μA shutdown current, 350kHz–2.5MHz configurable switching frequency, and power-good monitoring - deployed in automotive infotainment and ADAS power rails.

For engineers reviewing the MPQ4323GDE-AEC1-Z datasheet, MPQ4323GDE-AEC1-Z pinout, MPQ4323GDE-AEC1-Z application, or MPQ4323GDE-AEC1-Z equivalent, key selection criteria include cold-crank support (3.1V min VIN), CISPR25 Class 5 EMI compliance, wettable flank QFN-12 (2mm×3mm) package, and integrated low-dropout mode for automotive battery transients.

Technical Context

The MPQ4323GDE-AEC1-Z uses peak current mode control with frequency foldback during startup to prevent inductor current runaway. Its advanced asynchronous modulation (AAM) dynamically scales switching frequency under light loads to minimize gate-driving and switching losses, enabling ultra-low quiescent current operation.

Thermal management is enhanced by MeshConnect™ flip-chip packaging and symmetric VIN pinout, while protection features include hiccup-mode over-current protection, thermal shutdown at 160°C–185°C, and ±1.5% PG threshold hysteresis referenced to V_FB or V_OUT.

Key Specifications

Pinout & Package

MPQ4323GDE-AEC1-Z is housed in a wettable flank QFN-12 package measuring 2mm × 3mm with exposed thermal pad. The package supports automated optical inspection (AOI) and improves solder joint reliability in automotive reflow processes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down converter applications.

Compared with LM61480-Q1 and TPS543B20, MPQ4323GDE-AEC1-Z uniquely combines AEC-Q100 Grade 1, 42V load dump tolerance, wettable flank packaging, and CISPR25 Class 5 EMI compliance in a 2mm×3mm footprint - making it optimal for space-constrained, safety-critical automotive subsystems where board area and qualification rigor are primary constraints.

Availability

MPQ4323GDE-AEC1-Z is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS domain controllers, and digital instrument clusters requiring stable component supply across extended temperature and qualification requirements.

Supply support for MPQ4323GDE-AEC1-Z 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 for automotive, industrial, and consumer markets.

The MPQ4323 product line targets automotive power conversion with emphasis on AEC-Q100 qualification, load dump resilience, and EMI robustness - designed specifically for next-generation vehicle electronics demanding compact, reliable, and compliant DC/DC solutions.

FAQ

What is the minimum input voltage required for startup?

The MPQ4323GDE-AEC1-Z requires a minimum VIN of 3.9V to initiate startup, as defined by its UVLO rising threshold. Once operational, it sustains regulation down to 3.1V during cold-crank events, leveraging its low-dropout mode to maintain output stability without dropout.

Does this part support fixed-output voltage configurations?

Yes - MPQ4323GDE-AEC1-Z is the adjustable version, but fixed-output variants exist: MPQ4323GDE-33-AEC1-Z (3.3V) and MPQ4323GDE-38-AEC1-Z (3.8V). These integrate internal feedback resistors, eliminating external dividers while maintaining identical package, pinout, and qualification.

How is EMI performance validated for automotive use?

The MPQ4323GDE-AEC1-Z is certified to CISPR25 Class 5 for both conducted and radiated emissions (150kHz–1GHz) using standard test boards per ISO 7637-2 and ISO 11452-2. Its FSS modulation, symmetric VIN pinout, and MeshConnect™ packaging collectively suppress peak emissions below regulatory limits.

What thermal performance can be expected in the 2mm×3mm QFN package?

On a 4-layer 2oz copper evaluation board (EVQ4323-D-00A), the QFN-12 (2mm×3mm) variant achieves θ_JA = 35.5°C/W and θ_JC = 3.5°C/W. At 3A load and 12V input, case temperature rise remains under 30°C - enabling operation without heatsinks in most automotive ambient conditions.

Is the PG pin compatible with 1.8V or 3.3V logic systems?

Yes - the open-drain PG output requires an external pull-up to the host logic rail (1.8V, 3.3V, or 5V). Its VOL is ≤0.3V at 1mA sink current, ensuring valid low-state recognition across common logic families without level-shifting circuitry.

What protection features are included beyond over-current and thermal shutdown?

In addition to hiccup-mode OCP and thermal shutdown, the device integrates VIN over-voltage protection (35.5V–40V trip), bootstrap refresh monitoring, undervoltage lockout with hysteresis, and precise power-good detection with independent rising/falling thresholds and deglitch timing.

Can the switching frequency be synchronized to an external clock?

No - the MPQ4323GDE-AEC1-Z does not support external clock synchronization. Frequency is set solely via the resistor on the FREQ pin, with optional spread-spectrum modulation enabled internally. For sync-capable alternatives, consider MPS's MPQ4331 series.