Monolithic Power Systems Inc. MPQ4347GLE-5-AEC1-P

Overview

MPQ4347GLE-5-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 5V 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-5-AEC1-P datasheet, MPQ4347GLE-5-AEC1-P pinout, MPQ4347GLE-5-AEC1-P application, or MPQ4347GLE-5-AEC1-P equivalent, key selection considerations include its AAM/FCCM mode control, 20ns minimum on-time, wettable-flank QFN-17 package, CISPR25 Class 5 EMI compliance, and cold-crank low-dropout operation under 3.1V input.

Technical Context

The MPQ4347GLE-5-AEC1-P implements zero-delay PWM control with configurable switching frequency (350kHz–2.5MHz) via external resistor, enabling optimization of efficiency vs. size trade-offs in automotive power systems. Its advanced asynchronous modulation (AAM) dynamically scales fSW under light loads to reduce gate and switching losses while maintaining regulation.

It features integrated thermal shutdown, over-current protection with hiccup mode, open-drain power-good (PG) monitoring ±6% of nominal VOUT, and a dedicated BST bootstrap capacitor path for high-side drive. The device enters low-dropout mode during cold-crank conditions and supports external synchronization via SYNCIN/MODE pin.

Key Specifications

Pinout & Package

MPQ4347GLE-5-AEC1-P is housed in a thermally enhanced, wettable-flank QFN-17 (3mm × 4mm) package with exposed thermal pad. Pin numbering follows standard top-view orientation with pin 1 marked by dot or beveled corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4347JGLE-5-AEC1-P, the subject part saves 0.3mm² PCB area and eliminates one NC pin, while matching all automotive-grade performance specs; versus TPS62933QPWRQ1, it delivers 33% higher current, guaranteed cold-crank operation, and full load-dump immunity - essential for OEM-compliant power design.

Availability

MPQ4347GLE-5-AEC1-P is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, digital instrument clusters, and telematics systems requiring stable component supply with full AEC-Q100 traceability and long-term lifecycle support.

Supply support for MPQ4347GLE-5-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 over two decades of innovation in DC/DC converters, motor drivers, and LED drivers.

The MPQ4347 product line targets automotive power conversion, emphasizing AEC-Q100 qualification, extended temperature operation, and EMI robustness for safety-critical subsystems such as infotainment and driver assistance.

FAQ

What is the recommended input capacitor for MPQ4347GLE-5-AEC1-P?

A minimum 10µF X7R ceramic capacitor rated ≥50V must be placed as close as possible to the VIN and PGND pins. For optimal EMI suppression and transient response, combine with a 100nF capacitor in parallel and ensure low-ESR construction. Layout priority is minimizing the high-di/dt loop between VIN, SW, and PGND.

Does MPQ4347GLE-5-AEC1-P require an external feedback resistor network?

No. This part integrates the feedback divider for a fixed 5.0V output, eliminating external resistors and associated tolerance drift. The internal reference is trimmed to ±1.2% over temperature, ensuring stable regulation without calibration or layout sensitivity.

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 internal bias network and may cause erratic enable behavior, unstable soft-start, or failure to enter shutdown mode. This connection is mandatory per MPS design guidelines and verified in production test.

Can MPQ4347GLE-5-AEC1-P operate with a 2.5MHz switching frequency?

Yes - configure fSW to 2.5MHz using a 15kΩ resistor from FREQ to GND. At this frequency, ensure inductor DCR ≤12mΩ and use low-ESR output capacitors (e.g., 22µF ×2 X5R) to maintain >90% efficiency at 2A load with 12V input.

What is the purpose of the BST capacitor, and how is its value determined?

The BST capacitor (0.1µF X7R, 16V) provides charge storage for the high-side gate driver. Its value ensures sufficient charge transfer during each switching cycle. Undersizing causes HS-FET turn-on failure; oversizing adds unnecessary cost and board space. Placement must be adjacent to BST and SW pins.

Is MPQ4347GLE-5-AEC1-P compatible with lead-free reflow profiles?

Yes - it is qualified for standard JEDEC J-STD-020D Level 1 moisture sensitivity and supports peak reflow temperatures up to 260°C. The wettable-flank design ensures reliable solder fillet formation under IPC-A-610 Class 3 criteria for automotive assemblies.

How does the PG pin behave during startup and fault conditions?

PG remains low until VOUT reaches 94% of 5V (4.7V), then asserts high after 50µs deglitch time. It pulls low again if VOUT drops below 4.65V or rises above 5.3V. When unused, PG must be left floating - no pull-up is needed unless interfacing with an external logic input requiring active-high signaling.