Monolithic Power Systems Inc. MPQ4328GRE-5-AEC1-P

Overview

MPQ4328GRE-5-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, synchronous step-down DC/DC converter delivering up to 4A output current with 3.3V–36V input range, fixed 5V output, and 1μA shutdown quiescent current. It integrates 45mΩ high-side and 25mΩ low-side MOSFETs, supports 200kHz–2.5MHz configurable switching frequency, and features power good (PG), spread-spectrum modulation, and cold-crank low-dropout mode for automotive infotainment and ADAS power rails.

For engineers reviewing the MPQ4328GRE-5-AEC1-P datasheet, MPQ4328GRE-5-AEC1-P pinout, MPQ4328GRE-5-AEC1-P application, or MPQ4328GRE-5-AEC1-P equivalent, key selection criteria include its AEC-Q100 qualification, wettable-flank QFN-14 package, 5V fixed output with ±1.5% PG threshold tolerance, 50ns minimum on-time, and thermal shutdown at 170°C - all critical for automotive ECU and cluster supply design.

Technical Context

The MPQ4328GRE-5-AEC1-P employs peak current mode control with frequency foldback during start-up to prevent inductor current runaway. Its Advanced Asynchronous Modulation (AAM) enables light-load efficiency optimization by scaling switching frequency downward, while Forced Continuous Conduction Mode (FCCM) is selectable via SYNC/MODE pin voltage thresholds (0.4V/1.4V).

It implements dual-stage protection: over-current protection with hiccup-mode recovery (HS limit 7.5A typ, LS valley limit 5A typ), and robust thermal management with 170°C shutdown and 20°C hysteresis. The internal 5V VCC regulator powers gate drivers and control logic, and BIAS pin connection to VOUT reduces IQ to 3µA.

Key Specifications

Pinout & Package

MPQ4328GRE-5-AEC1-P is housed in a wettable-flank QFN-14 (4mm × 4mm) package with exposed thermal pad, supporting automated optical inspection (AOI) and enhanced solder joint reliability per automotive standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4328GRE-5-AEC1-P, the adjustable MPQ4328GRE-AEC1-P adds design flexibility at the cost of two external resistors, while TPS62933RQWR sacrifices automotive thermal grade and EMI performance for marginally lower IQ - making the MPQ4328GRE-5-AEC1-P optimal for space-constrained, full-grade AEC-Q100 systems demanding fixed 5V.

Availability

MPQ4328GRE-5-AEC1-P is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and digital instrument clusters requiring stable component supply with full AEC-Q100 traceability and long-term production support.

Supply support for MPQ4328GRE-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 core expertise in DC/DC conversion, motor drivers, and LED lighting controllers.

The MPQ4328 product line targets automotive power systems requiring AEC-Q100 qualification, low quiescent current, and robust EMI performance - designed specifically for infotainment, cluster, and ADAS sub-systems operating in extreme temperature and transient environments.

FAQ

What is the purpose of the BIAS pin on MPQ4328GRE-5-AEC1-P?

The BIAS pin accepts an external 5V supply-typically connected directly to VOUT-to power the internal bias regulator, reducing quiescent current from 24μA to 3μA in sleep mode. This connection is mandatory for achieving the lowest possible IQ and must be established after VIN is stable; floating or premature application risks malfunction.

Does MPQ4328GRE-5-AEC1-P support synchronization to an external clock?

Yes. Driving the SYNC/MODE pin with a 200kHz–2.5MHz external clock forces FCCM operation and synchronizes switching edges to that source. The device locks within 128 cycles and tolerates ±5% frequency deviation, enabling deterministic EMI reduction in multi-rail systems.

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

PG asserts high after a 1.2ms delay once VOUT reaches 94.5% of 5V and remains high as long as VOUT stays within 94.5%–105.5%. It pulls low if VOUT exceeds 107% or drops below 93%, with 160μs deglitching on both edges to reject noise-induced false triggers.

What thermal derating applies to the 4A output rating?

The 4A rating assumes θJA = 46.7°C/W on a 4-layer JEDEC board. On a typical 2oz copper EVB (θJA = 25.7°C/W), full 4A is sustainable up to +85°C ambient. Above that, output current must be linearly reduced using TJ(MAX) = 150°C and measured θJA to avoid thermal shutdown.

Can MPQ4328GRE-5-AEC1-P operate with input voltage below 3.3V?

No. The absolute minimum operating input is 3.3V, and UVLO rising threshold is 3.7V typical. Below this, the device remains disabled. During cold-crank events where battery dips to 3.0V, the part sustains regulation via low-dropout mode only if VIN remains ≥ VOUT + 0.5V (i.e., ≥5.5V for 5V output).

Is the QFN-14 package lead-free and RoHS compliant?

Yes. MPQ4328GRE-5-AEC1-P uses lead-free, halogen-free packaging and fully complies with EU RoHS Directive 2011/65/EU. MPS confirms green status on its Quality Assurance portal, with material declarations available upon request.

What is the recommended PCB layout practice for the SW and BST nodes?

Minimize loop area between SW, BST, and the BST-to-SW capacitor (0.1μF). Route SW as a short, wide copper pour directly to the inductor; place the BST capacitor <1mm from SW/BST pins with vias to inner ground planes. Avoid routing sensitive analog traces (FB, AGND) near these nodes.