Monolithic Power Systems Inc. MPQ4347GLE-33-AEC1-Z

Overview

MPQ4347GLE-33-AEC1-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified synchronous step-down converter delivering 4A continuous output at fixed 3.3V, operating from 3.3V to 36V input with 42V load dump tolerance, 1μA shutdown current, and integrated 60mΩ/35mΩ MOSFETs - deployed in automotive infotainment power rails.

For engineers reviewing the MPQ4347GLE-33-AEC1-Z datasheet, MPQ4347GLE-33-AEC1-Z pinout, MPQ4347GLE-33-AEC1-Z application, or MPQ4347GLE-33-AEC1-Z equivalent, key selection criteria include cold-crank low-dropout mode, AAM light-load efficiency optimization, CISPR25 Class 5 EMI compliance, and QFN-17 wettable flank package for automated optical inspection.

Technical Context

This buck regulator uses zero-delay PWM control with configurable switching frequency (350kHz–2.5MHz) and supports both forced continuous conduction mode (FCCM) and advanced asynchronous modulation (AAM) via SYNCIN/MODE pin logic. It integrates high-side and low-side MOSFETs with thermal shutdown, power-good monitoring, and internal bootstrap charging circuitry.

The device implements a symmetric VIN pinout and MeshConnect™ flip-chip packaging to reduce parasitic inductance and improve EMC performance. Its 20ns minimum on-time enables high step-down ratios at high frequencies, while the 3.1V cold-crank support ensures operation during automotive battery sag conditions.

Key Specifications

Pinout & Package

MPQ4347GLE-33-AEC1-Z is housed in a thermally enhanced QFN-17 (3mm × 4mm) package with wettable flanks for solder joint inspection. The package features exposed thermal pad (EP) connected to PGND for efficient heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4347JGLE-33-AEC1-Z, the QFN-19 variant offers identical regulation but improved testability; versus TPS543320RTWR, the MPQ4347GLE-33-AEC1-Z provides automotive qualification, wider input range, lower quiescent current, and superior thermal performance in harsh environments.

Availability

MPQ4347GLE-33-AEC1-Z is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, digital instrument clusters, and industrial telematics requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for MPQ4347GLE-33-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, and global distribution through authorized partners.

The MPQ4347 series belongs to MPS's automotive-grade DC-DC converter product line, engineered specifically for demanding vehicular environments requiring AEC-Q100 qualification, high efficiency across load ranges, and robust EMI performance.

FAQ

What is the purpose of the DNU pin on MPQ4347GLE-33-AEC1-Z?

The DNU (Do Not Use) pin must be connected directly to the VCC pin. Leaving it floating may cause unpredictable behavior or failure to enable. This pin is reserved for internal testing and has no functional role in normal operation, but its mandatory tie to VCC ensures proper biasing of internal circuitry.

Does MPQ4347GLE-33-AEC1-Z support external frequency synchronization?

Yes - the SYNCIN/MODE pin accepts an external clock signal to synchronize switching frequency, and the SYNCO pin outputs a phase-aligned clock. When SYNCIN/MODE is driven with an external clock, the device locks to that frequency within ±15%, enabling deterministic EMI reduction in multi-rail systems.

How does the AAM mode improve light-load efficiency?

AAM (Advanced Asynchronous Modulation) reduces switching frequency under light loads to minimize gate drive and switching losses, lowering quiescent current to 3μA. Unlike traditional pulse-skipping, AAM maintains regulation accuracy and avoids audible noise by dynamically adjusting burst intervals based on output deviation.

What is the recommended layout practice for the BST and SW pins?

A low-ESR ceramic capacitor (typically 0.1µF) must be placed between BST and SW pins, with minimal trace length and loop area. This capacitor supplies gate charge for the high-side MOSFET; improper placement causes shoot-through, reduced efficiency, or thermal runaway due to insufficient bootstrap voltage.

Can MPQ4347GLE-33-AEC1-Z operate with input voltage below 3.3V?

No - the absolute minimum operating input voltage is 3.3V per datasheet specifications. However, it supports cold-crank down to 3.1V via UVLO hysteresis and enters low-dropout mode to sustain 3.3V output at >90% duty cycle, provided the input remains ≥3.1V and does not fall below the 2.8V UVLO falling threshold.

Is the 3.3V output voltage trimmed at production?

Yes - the fixed 3.3V output is factory-trimmed to ±1% accuracy over -40°C to +150°C, verified across temperature and line/load conditions. No external feedback components are required, eliminating resistor tolerance errors and simplifying layout for automotive ASIL-B compatible systems.

What thermal derating applies above 25°C ambient?

With θJA = 44.7°C/W on a 4-layer JEDEC board, maximum continuous power dissipation decreases linearly: PD(MAX) = (150°C − TA)/44.7. At 85°C ambient, max power drops to ~1.45W - requiring careful thermal design, copper pour, and airflow management in sealed enclosures.