Monolithic Power Systems Inc. MPQ4323GDE-AEC1-P

Overview

MPQ4323GDE-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 frequency configuration from 350kHz to 2.5MHz, and features 1μA shutdown current for automotive battery-sensitive systems such as infotainment power rails.

For engineers reviewing the MPQ4323GDE-AEC1-P datasheet, MPQ4323GDE-AEC1-P pinout, MPQ4323GDE-AEC1-P application, or MPQ4323GDE-AEC1-P equivalent, key selection criteria include cold-crank support (3.1V min VIN), ±1.5% feedback voltage accuracy, CISPR25 Class 5 EMI compliance, and wettable flank QFN-12 (2mm×3mm) package for automated optical inspection in automotive PCB assembly.

Technical Context

The MPQ4323 employs peak current mode control with frequency foldback during start-up 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, while integrated protections include hiccup-mode over-current protection, thermal shutdown at 175°C, and low-dropout operation supporting automotive cold-crank conditions down to 3.1V input with regulated output.

Key Specifications

Pinout & Package

MPQ4323GDE-AEC1-P uses a wettable flank QFN-12 (2mm×3mm) package with exposed thermal pad. Pin layout follows symmetric VIN topology to reduce loop inductance and improve EMI performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4323GDE-AEC1-P, the fixed-output variants trade adjustable regulation flexibility for reduced BOM count and improved production consistency-making them preferable in volume automotive programs where output voltage is standardized and layout space is constrained.

Availability

MPQ4323GDE-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 AEC-Q100 qualification and traceable sourcing.

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

The MPQ4323 product line delivers ultra-compact, AEC-Q100-qualified DC/DC converters optimized for harsh automotive environments-including load dump, cold crank, and wide temperature operation-with integrated EMI mitigation and wettable flank packaging.

FAQ

What is the minimum input voltage required for startup and sustained operation?

The MPQ4323GDE-AEC1-P requires a minimum VIN of 3.9V to initiate startup due to its UVLO rising threshold of 3.65V typical. Once running, it sustains regulation down to 3.1V input-supporting automotive cold-crank conditions without output dropout. This dual-threshold behavior is enabled by 750mV UVLO hysteresis.

How does the frequency spread spectrum (FSS) feature reduce EMI?

FSS modulates the switching frequency by ±10% at 15kHz, spreading energy across a wider bandwidth and reducing peak amplitudes in both conducted and radiated emissions. This enables compliance with CISPR25 Class 5 limits without additional ferrite beads or shielded inductors-verified in MPS's standard EVB test reports.

Can the MPQ4323GDE-AEC1-P operate without the PG (power good) signal connected?

Yes-the PG pin is open-drain and may be left floating if power sequencing is not required. However, leaving it unconnected forfeits system-level fault detection capability. For robust designs, connect PG to a microcontroller GPIO with a 10kΩ pull-up to monitor output regulation status during startup and transient events.

What is the purpose of the dual VIN pins (pins 2 and 10)?

Pins 2 and 10 are internally connected and serve to reduce PCB trace inductance and thermal resistance at the high-current input node. Each pin must have its own local 10μF ceramic decoupling capacitor placed as close as possible to minimize switching noise coupling into the control circuitry and improve EMI performance.

Does the device support forced PWM mode, or is it limited to AAM operation?

The MPQ4323GDE-AEC1-P operates exclusively in Advanced Asynchronous Modulation (AAM) mode-there is no forced PWM option. AAM automatically transitions between PWM and pulse-skipping based on load, maintaining high efficiency from 10mA to 3A while avoiding audible noise and minimizing light-load quiescent current to 20μA.

How is thermal performance affected by the wettable flank package?

The wettable flank structure improves solder joint reliability and thermal conduction from the die to the PCB copper plane. On the standard 4-layer evaluation board, θJA is 60°C/W-35% lower than conventional QFN packages-enabling full 3A output at +85°C ambient without thermal derating or heatsinks.

What protection features are included, and how do they behave during fault conditions?

The device integrates hiccup-mode over-current protection (OCP), thermal shutdown at 175°C with 20°C hysteresis, and input over-voltage protection (37.5V typical). During OCP, the converter cycles on/off until fault clears; thermal shutdown disables switching entirely until junction cools below 155°C, preventing permanent damage.