Monolithic Power Systems Inc. MPQ4323GDE-33-AEC1-P

Overview

MPQ4323GDE-33-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified synchronous step-down converter delivering 3A output with 3.3V fixed output, 3.3V–36V input range, and 42V load dump tolerance. It integrates 70mΩ high-side and 50mΩ low-side MOSFETs in a wettable-flank QFN-12 (2mm×3mm) package, supporting automotive infotainment and ADAS power rails under cold-crank (3.1V) and harsh EMI environments.

For engineers reviewing the MPQ4323GDE-33-AEC1-P datasheet, MPQ4323GDE-33-AEC1-P pinout, MPQ4323GDE-33-AEC1-P application, or MPQ4323GDE-33-AEC1-P equivalent, key selection criteria include its 1μA shutdown current, frequency-configurable operation (350kHz–2.5MHz), CISPR25 Class 5 compliance, and integrated power-good signaling for automotive system monitoring.

Technical Context

The MPQ4323GDE-33-AEC1-P employs peak current mode control with frequency foldback during start-up to prevent inductor current runaway. Its advanced asynchronous modulation (AAM) reduces light-load switching losses, while symmetric VIN pinout and Frequency Spread Spectrum (FSS) minimize conducted and radiated EMI.

It operates across –40°C to +150°C junction temperature, supports low-dropout mode down to 3.1V input, and delivers ±1.5% output accuracy over temperature and line/load variations-enabling robust regulation in automotive cold-crank and load-dump transients.

Key Specifications

Pinout & Package

MPQ4323GDE-33-AEC1-P uses a wettable-flank QFN-12 (2mm × 3mm) package with exposed thermal pad. Pin layout follows symmetric VIN configuration to reduce loop inductance and improve EMC performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4323GDE-33-AEC1-P, the -38 variant offers identical form-fit-function except output voltage, while LM61480-Q1 trades EMI robustness and extended temperature capability for marginally higher current-making the MPQ4323GDE-33-AEC1-P optimal for space-constrained, emission-sensitive automotive modules.

Availability

MPQ4323GDE-33-AEC1-P is available at Aetrix Electronics and suitable for automotive infotainment, instrument clusters, ADAS camera modules, and industrial telematics requiring stable component supply with full AEC-Q100 traceability and long-term production support.

Supply support for MPQ4323GDE-33-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, with design centers in the US, China, and Taiwan.

The MPQ4323 product line targets automotive power conversion with emphasis on load-dump resilience, ultra-low quiescent current, and EMI-hardened integration-designed specifically for next-generation ADAS, infotainment, and body electronics.

FAQ

What is the purpose of the dual VIN pins (pins 2 and 10) on MPQ4323GDE-33-AEC1-P?

The dual VIN pins reduce high-frequency current loop inductance and distribute input ripple current, improving EMC performance and thermal sharing. Each pin must be decoupled with a local 10µF ceramic capacitor placed as close as possible to minimize switching noise injection into the input rail.

Does MPQ4323GDE-33-AEC1-P require an external feedback resistor network?

No. The "-33" suffix denotes a factory-trimmed 3.3V fixed-output version; the FB pin is internally connected to the 0.8V reference and bypassed. External resistors are unnecessary and must not be added, as they would disrupt regulation accuracy and stability.

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

FSS modulates switching frequency by ±10% at 15kHz, spreading energy across a bandwidth rather than concentrating it at harmonics. This lowers peak conducted and radiated emissions by up to 10dB, enabling CISPR25 Class 5 compliance without additional LC filters or shielding.

Can MPQ4323GDE-33-AEC1-P operate with input voltage below 3.3V?

No. The absolute minimum operating VIN is 3.3V, and startup requires ≥3.9V. However, once running, it sustains regulation down to 3.1V under cold-crank conditions-enabled by high-duty-cycle and low-dropout modes-but will not start from sub-3.3V sources.

What is the significance of the wettable flank feature in this QFN package?

Wettable flanks expose solderable metal along the vertical side walls of the QFN, allowing automated optical inspection (AOI) to verify solder joint integrity-critical for automotive AEC-Q200-compliant manufacturing and zero-defect quality requirements in safety-critical systems.

Is thermal derating required when operating at maximum ambient temperature?

Yes. At TA = 125°C, maximum continuous output current drops to ~1.8A due to thermal limits (θJA = 60°C/W). Full 3A operation is guaranteed only up to TA = 85°C with adequate PCB copper area (≥4-layer, 2oz, thermal vias under exposed pad) per MPS EVB guidelines.

How does the power-good (PG) signal behave during startup and fault conditions?

PG remains low until VOUT reaches 94.5% of 3.3V and stays within regulation window for ≥70μs. It goes low again if VOUT exceeds 107% or falls below 93%, providing glitch-filtered status for system sequencers and watchdogs-no external pull-up is needed if unused (float).