Monolithic Power Systems Inc. MPQ4323MGQCE-AEC1-P

Overview

MPQ4323MGQCE-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, synchronous step-down DC/DC converter delivering 3A continuous output current with 3.3V–36V input range and 42V load dump tolerance. It integrates 70mΩ high-side and 50mΩ low-side MOSFETs, supports 350kHz–2.5MHz configurable switching frequency, and achieves 1μA shutdown current for automotive battery-sensitive applications such as infotainment power rails.

For engineers reviewing the MPQ4323MGQCE-AEC1-P datasheet, MPQ4323MGQCE-AEC1-P pinout, MPQ4323MGQCE-AEC1-P application, or MPQ4323MGQCE-AEC1-P equivalent, key selection criteria include cold-crank support (3.1V min VIN), ±1.5% feedback voltage accuracy over –40°C to +150°C, CISPR25 Class 5 EMI compliance, and wettable flank QFN-12 (2mm×3mm) package for automated optical inspection.

Technical Context

The MPQ4323MGQCE-AEC1-P employs 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 20μA sleep-mode quiescent current and >90% efficiency at 10mA load with 12V input.

Thermal management is enhanced by MeshConnect™ flip-chip packaging and symmetric VIN pinout, reducing thermal resistance to θJA = 60°C/W (JESD51-7, 4-layer PCB). The device enters low-dropout (LDO) mode during automotive cold-crank events, sustaining regulated output down to VIN = 3.1V while maintaining 98% maximum duty cycle.

Key Specifications

Pinout & Package

MPQ4323MGQCE-AEC1-P uses a wettable flank QFN-12 package (2mm × 3mm, 0.5mm pitch) with exposed thermal pad. Pin layout follows symmetric VIN configuration to reduce EMI and improve thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4323GDE-AEC1, the MGQCE-AEC1-P adds wettable flanks for production traceability; compared with TPS543320RHLT, it delivers 2.5× wider input range, certified load dump survival, and AEC-Q100 Grade 1 reliability-making it irreplaceable in harsh automotive environments.

Availability

MPQ4323MGQCE-AEC1-P is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS sensor modules, and digital instrument clusters requiring stable component supply with full AEC-Q100 documentation and PPAP support.

Supply support for MPQ4323MGQCE-AEC1-P 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, with design centers in the US, China, and Taiwan.

The MPQ4323 product line targets automotive-grade DC/DC conversion, emphasizing load dump resilience, ultra-low IQ, and EMI-optimized packaging for next-generation vehicle electronics.

FAQ

What is the maximum allowable input voltage for continuous operation?

The MPQ4323MGQCE-AEC1-P supports continuous operation up to 36V input. Its absolute maximum rating is 42V for automotive load dump transients per ISO 16750-2, but sustained operation above 36V may trigger overvoltage protection and cause shutdown.

Does this part support adjustable output voltage?

Yes-MPQ4323MGQCE-AEC1-P supports adjustable output via external resistor divider on the FB pin, with typical feedback voltage of 0.8V ±1.5%. Fixed-output variants (e.g., 3.3V or 3.8V) are also available under different order codes but require separate part numbers.

How is thermal performance affected by PCB layout?

Thermal resistance θJA is rated at 60°C/W on a JESD51-7 4-layer board. Real-world performance depends critically on thermal pad soldering quality and copper area: ≥250mm² of 2oz inner-layer copper connected to the exposed pad reduces case rise by up to 15°C at 3A load.

Can the PG pin drive an MCU interrupt directly?

Yes-the PG pin is an open-drain output compatible with 3.3V or 5V logic. A 10kΩ pull-up to the MCU's I/O supply is sufficient; its 70μs deglitch time prevents false triggering during brief output transients, and VPG_LOW ≤0.3V at 1mA ensures clean low-level assertion.

Is frequency spread spectrum (FSS) enabled by default?

Yes-FSS modulation is active whenever the device is operating in normal switching mode. It cannot be disabled; the ±10% frequency dithering occurs automatically at 15kHz to suppress narrowband EMI peaks without requiring external configuration.

What is the minimum recommended output capacitance?

MPS specifies ≥22µF total output capacitance using low-ESR ceramic capacitors. For 3A loads, two 10µF/16V X7R 0805 devices placed symmetrically near the SW and PGND pins meet ripple and transient response requirements while minimizing loop inductance.

Does the part include overtemperature protection?

Yes-thermal shutdown activates at TJ = 175°C (typical), with 20°C hysteresis. Before shutdown, the device implements frequency foldback to reduce power dissipation; recovery occurs automatically once junction temperature falls below 155°C.