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

Overview

MPQ4347GLE-33-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified synchronous step-down DC/DC converter delivering 4A continuous output at fixed 3.3V, with 3.3V–36V input range, 1μA shutdown current, and integrated 60mΩ/35mΩ MOSFETs. It supports automotive cold-crank (3.1V) and 42V load dump, operates from –40°C to +150°C, and targets power rails in ADAS camera modules and infotainment head units.

For engineers reviewing the MPQ4347GLE-33-AEC1-P datasheet, MPQ4347GLE-33-AEC1-P pinout, MPQ4347GLE-33-AEC1-P application, or MPQ4347GLE-33-AEC1-P equivalent, key selection criteria include its ultra-low quiescent current in sleep mode (3µA), configurable switching frequency (350kHz–2.5MHz), AAM light-load efficiency mode, CISPR25 Class 5 EMI compliance, and QFN-17 (3mm×4mm) wettable flank package with thermal performance validated for under-hood environments.

Technical Context

This buck converter uses zero-delay PWM control with internal high-side and low-side MOSFETs to deliver fast transient response and stable regulation across wide load and input voltage ranges. Its architecture integrates bootstrap charging, power-good monitoring, and dual-mode operation-forced CCM for noise-sensitive systems and AAM for battery longevity.

The device implements advanced protection including over-current (hiccup mode), thermal shutdown (150°C trip), input UVLO (2.8V rising), and output voltage accuracy of ±1% over temperature (3230–3370 mV at 3.3V). Frequency spread spectrum and symmetric VIN pinout further reduce conducted EMI in automotive 12V/24V systems.

Key Specifications

Pinout & Package

MPQ4347GLE-33-AEC1-P is housed in a thermally enhanced QFN-17 (3mm × 4mm) package with wettable flanks for automated optical inspection (AOI) and improved solder joint reliability in automotive reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4347JGLE-33-AEC1-P, the subject part offers identical performance in a smaller QFN-17 footprint but omits SYNCO - advantageous for space-constrained layouts where external synchronization is unnecessary. Versus TPS62933RTER, it delivers 33% higher current, 2.5× wider input range, and full AEC-Q100 compliance - essential for functional safety deployment.

Availability

MPQ4347GLE-33-AEC1-P is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment head units, digital instrument clusters, and telematics control units requiring stable component supply across extended temperature and lifetime requirements.

Supply support for MPQ4347GLE-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, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MPQ4347 product line is engineered specifically for automotive power conversion - emphasizing AEC-Q100 qualification, extended temperature operation, transient robustness, and EMI resilience in harsh vehicular environments.

FAQ

What is the minimum input voltage required for startup?

The MPQ4347GLE-33-AEC1-P has a VIN UVLO rising threshold of 2.8V to 3.2V, allowing reliable startup down to 3.1V during automotive cold-crank conditions. Below this, the device remains disabled until input rises above the hysteresis window (200mV), ensuring clean power-up without brownout oscillation.

How does the AAM mode improve light-load efficiency?

AAM mode dynamically reduces switching frequency under light loads - e.g., dropping from 2.2MHz to ~410kHz - which lowers gate drive and switching losses. At 1mA load, this achieves >85% efficiency versus ~65% in FCCM, extending battery life in always-on vehicle subsystems.

Can the MPQ4347GLE-33-AEC1-P be synchronized to an external clock?

Yes - applying a clock signal to the SYNCIN/MODE pin synchronizes the internal oscillator to frequencies within ±15% of the free-running fSW. This eliminates beat frequencies in multi-rail systems and simplifies EMI filter design by fixing switching harmonics.

What is the purpose of the DNU pin, and how must it be connected?

Pin 14 is designated Do Not Use (DNU) and must be connected directly to the VCC pin. Leaving it floating or connecting it elsewhere may cause undefined behavior or failure to regulate, as confirmed in the absolute maximum ratings and pin function table of the official datasheet.

Does this part support adjustable output voltage?

No - MPQ4347GLE-33-AEC1-P is factory-trimmed for fixed 3.3V output. The "GLE" suffix denotes fixed-output variants; adjustable versions (e.g., MPQ4347GLET-AEC1-P) require external feedback resistors and are separate orderable SKUs.

What thermal derating applies at 105°C ambient?

With θJA = 44.7°C/W on a 4-layer JEDEC board, the device delivers full 4A up to ~85°C ambient. At 105°C, output current must be reduced to ~3.2A to maintain TJ ≤ 150°C - verified using PD(MAX) = (150 − 105)/44.7 ≈ 1.01W and efficiency curves.

Is the PG signal active-high or open-drain?

The PG pin is open-drain with no internal pull-up. It requires an external pull-up resistor (typically 10kΩ to 3.3V or 5V) to assert high when VOUT is within 94–106% of 3.3V. When out-of-regulation, PG pulls low via an internal 1mA sink capable of 0.3V max drop.