Monolithic Power Systems Inc. MPQ4347GLE-37-AEC1-P

Overview

MPQ4347GLE-37-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 3.7V with ultra-low 1µA shutdown current and 3µA sleep-mode quiescent current. It integrates 60mΩ high-side and 35mΩ low-side MOSFETs, supports 3.3V–36V input (42V load dump tolerant), and operates from –40°C to +150°C junction temperature-designed for automotive infotainment power rails.

For engineers reviewing the MPQ4347GLE-37-AEC1-P datasheet, MPQ4347GLE-37-AEC1-P pinout, MPQ4347GLE-37-AEC1-P application, or MPQ4347GLE-37-AEC1-P equivalent, key selection considerations include its AAM/FCCM mode switching control, 20ns minimum on-time, wettable-flank QFN-17 package, and PG signal with ±6% window for automotive system monitoring.

Technical Context

The MPQ4347GLE-37-AEC1-P implements zero-delay PWM control with configurable 350kHz–2.5MHz switching frequency via external resistor, enabling EMI optimization in space-constrained automotive modules. Its advanced asynchronous modulation (AAM) dynamically scales fSW under light loads to maintain >85% efficiency down to 100µA output current.

It features integrated thermal shutdown (150°C trip), over-current protection with hiccup mode, and a dedicated low-dropout mode supporting cold-crank operation down to 3.1V VIN while sustaining regulated 3.7V output-critical for automotive cluster and ADAS subsystems requiring uninterrupted power during engine start.

Key Specifications

Pinout & Package

MPQ4347GLE-37-AEC1-P is housed in a wettable-flank QFN-17 (3mm × 4mm) package with exposed thermal pad, optimized for automated optical inspection (AOI) and enhanced thermal performance in automotive PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4347JGLE-37-AEC1-P, the MPQ4347GLE-37-AEC1-P offers identical regulation and protection but saves one pin and simplifies layout in space-constrained modules; versus TPS62933AQRGZTQ1, it delivers superior cold-crank operation, wider output voltage flexibility, and built-in AAM for extended battery life.

Availability

MPQ4347GLE-37-AEC1-P is available at Aetrix Electronics and suitable for automotive instrument clusters, infotainment systems, and ADAS camera modules requiring stable component supply with AEC-Q100 compliance and long-term production continuity.

Supply support for MPQ4347GLE-37-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 MPQ4347 series belongs to MPS's AEC-Q100-qualified automotive DC/DC converter product line, engineered specifically for harsh-environment power conversion in infotainment, cluster, and ADAS subsystems where efficiency, reliability, and EMI robustness are critical.

FAQ

What is the recommended input capacitor for MPQ4347GLE-37-AEC1-P?

Use a minimum 22µF X5R/X7R ceramic capacitor rated ≥50V placed directly between VIN and PGND pins. For optimal EMI suppression and transient response, combine with a 100nF capacitor in parallel and ensure both are located within 3mm of the VIN/PGND pads per the EVB layout guidelines.

Does MPQ4347GLE-37-AEC1-P require an external feedback resistor network?

No. The "-37" suffix indicates a factory-trimmed fixed 3.7V output; no external resistors are needed. The FB pin is internally connected to the reference, eliminating feedback divider errors and saving board space in cost-sensitive automotive designs.

How does the DNU pin function, and what happens if left unconnected?

Pin 14 (DNU) must be connected directly to VCC. Leaving it floating violates the absolute maximum ratings and may cause internal logic malfunction or latch-up due to undefined voltage on an unbuffered internal node-this is explicitly prohibited in the datasheet.

Can MPQ4347GLE-37-AEC1-P operate in forced continuous conduction mode (FCCM)?

Yes. Pulling the SYNCIN/MODE pin high (≥1.8V) forces FCCM operation, eliminating pulse-skipping and ensuring constant switching frequency-ideal for noise-sensitive applications like audio subsystems where variable-frequency operation could induce audible artifacts.

What is the thermal performance difference between QFN-17 and QFN-19 packages?

The QFN-17 (MPQ4347GLE) has θJA = 44.7°C/W and θJC = 5.2°C/W; the QFN-19 (MPQ4347JGLE) has θJA = 43.6°C/W and θJC = 5.4°C/W. In practice, both deliver nearly identical thermal rise under 4A load on standard 4-layer EVB, but QFN-19 offers marginally better heat spreading via additional thermal vias.

Is the PG signal compatible with 3.3V logic systems?

Yes. The open-drain PG output can be pulled up to any voltage ≤6V. For 3.3V logic, use a 10kΩ pull-up to 3.3V; PG sinks ≤0.3V at 1mA, ensuring solid low-state compatibility with standard CMOS inputs across temperature.

Does the device support output discharge during shutdown?

Yes. When EN is low, the internal discharge FET activates, sinking 1.8mA from VOUT to PGND to rapidly discharge output capacitance-preventing residual voltage that could interfere with downstream power sequencing or cause latch-up in connected logic.