Monolithic Power Systems Inc. MPQ4320GLE-AEC1-Z

Overview

MPQ4320GLE-AEC1-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified synchronous step-down converter with integrated 70mΩ high-side and 50mΩ low-side MOSFETs, delivering up to 0.5A output current across a 3.3V–36V input range and surviving 42V automotive load dump transients. It operates from –40°C to +150°C junction temperature and features 1μA shutdown current, configurable 350kHz–1.8MHz switching frequency, and power-good monitoring for automotive infotainment and ADAS power rails.

For engineers reviewing the MPQ4320GLE-AEC1-Z datasheet, MPQ4320GLE-AEC1-Z pinout, MPQ4320GLE-AEC1-Z application, or MPQ4320GLE-AEC1-Z equivalent, key selection criteria include its 42V load dump tolerance, cold-crank support down to 3.1V VIN, wettable-flank QFN-12 (3mm×4mm) package, CISPR25 Class 5 EMI compliance, and integrated low-dropout mode for automotive battery systems.

Technical Context

The MPQ4320GLE-AEC1-Z implements peak current mode control with frequency foldback during start-up to prevent inductor current runaway. Its advanced asynchronous modulation (AAM) reduces light-load quiescent current to 20μA while scaling switching frequency dynamically to maintain high efficiency across 10μA–500mA loads.

Thermal management is enhanced by MeshConnect™ flip-chip packaging and dual thermal paths-θJA = 50°C/W (JESD51-7), ΨJT = 1.2°C/W-enabling reliable operation under sustained 0.5A output at +125°C ambient. The device supports fixed-output variants (1V–5V) and adjustable configurations via external resistor divider on FB.

Key Specifications

Pinout & Package

The MPQ4320GLE-AEC1-Z is housed in a wettable-flank QFN-12 package measuring 3mm × 4mm, optimized for automated optical inspection (AOI) and robust solder joint reliability in automotive production.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Compared with MPQ4320GDE-AEC1-Z, the GLE variant offers superior thermal performance and larger solder fillets for AOI; versus LM61480QRNXTQ1, it delivers certified 42V transient resilience and lower shutdown current-critical for always-on automotive subsystems.

Availability

MPQ4320GLE-AEC1-Z is available at Aetrix Electronics and suitable for automotive infotainment, ADAS sensor modules, and digital instrument clusters requiring stable component supply across extended temperature and high-reliability automotive programs.

Supply support for MPQ4320GLE-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, with design centers in the US, China, and Taiwan.

The MPQ4320 product line targets automotive power conversion with AEC-Q100 qualification, focusing on load dump resilience, ultra-low IQ, and EMI-optimized integration for next-generation vehicle electronics.

FAQ

What is the minimum input voltage required for startup?

The MPQ4320GLE-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 VIN using low-dropout mode-critical for engine cranking scenarios where battery voltage dips below 6V.

How does the frequency spread spectrum (FSS) function impact EMI performance?

FSS modulates the switching frequency by ±10% at 15kHz, spreading energy across a bandwidth instead of concentrating it at discrete harmonics. This reduces peak conducted and radiated emissions by up to 10dB, enabling compliance with CISPR25 Class 5 without additional EMI filters in typical layouts.

Can the MPQ4320GLE-AEC1-Z operate with a 5.6µH inductor at 1.8MHz?

Yes-datasheet Figure 16 confirms stable operation with 5.6µH inductors at 1.8MHz. At this frequency, minimum on-time (65ns) and off-time (50ns) constraints are met, and efficiency remains >90% at 0.25A load with 12V input and 5V output.

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

Pins 2 and 10 are internally connected and provide parallel current paths for the input supply. This reduces effective trace inductance and voltage drop, improving transient response and lowering EMI generation-especially critical in high-current automotive environments with long harness runs.

Does the PG pin require an external pull-up resistor?

Yes-the PG pin is open-drain and must be pulled up to a valid logic-high voltage (e.g., VCC or another regulated rail) via an external resistor (typically 10kΩ). Without pull-up, PG cannot assert high to indicate valid output voltage, breaking system power sequencing or fault detection.

How is thermal performance affected by the wettable flank package?

The wettable flank structure improves solder joint visibility for AOI and enhances heat transfer from the die to the PCB via increased solder volume at the package perimeter. Measured ΨJT = 1.2°C/W confirms more efficient top-side conduction than standard QFN, reducing case temperature rise by ~3°C at 0.5A load.

Is the FB voltage reference trimmed across temperature?

Yes-the FB reference is specified as 0.79V to 0.81V over –40°C to +150°C, with typical drift of ±0.5mV/°C. This tight tolerance ensures output regulation accuracy remains within ±2% across full automotive temperature range without external calibration.