Monolithic Power Systems Inc. MPQ4326GRE-AEC1-P

Overview

MPQ4326GRE-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, synchronous step-down DC/DC converter with integrated 45mΩ high-side and 25mΩ low-side MOSFETs, delivering up to 6A output current at input voltages up to 36V and load-dump tolerance to 42V. It features 1μA shutdown current, configurable 200kHz–2.5MHz switching frequency, and power-good (PG) monitoring for automotive infotainment and ADAS power rails.

For engineers reviewing the MPQ4326GRE-AEC1-P datasheet, MPQ4326GRE-AEC1-P pinout, MPQ4326GRE-AEC1-P application, or MPQ4326GRE-AEC1-P equivalent, key selection criteria include cold-crank low-dropout mode, 50ns minimum on-time, CISPR25 Class 5 EMI compliance, AAM light-load efficiency optimization, and QFN-14 wettable-flank packaging for automotive-grade solder joint inspection.

Technical Context

The MPQ4326GRE-AEC1-P implements peak-current-mode control with frequency foldback during start-up to prevent inductor current runaway. Its dual-MOSFET architecture supports high duty cycle operation down to 0.8V output, enabling stable regulation during automotive cold-crank (VIN as low as 3.3V) while maintaining 94.5–105.5% PG window accuracy.

Thermal management leverages a MeshConnect™ flip-chip QFN-14 package with θJA = 46.7°C/W (JESD51-7), and functional safety support includes MPSafe™ QM system design documentation. The device operates across –40°C to +150°C junction temperature and integrates open-drain PG, SYNC/MODE selectable AAM/FCCM modes, and BIAS pin for IQ reduction.

Key Specifications

Pinout & Package

MPQ4326GRE-AEC1-P is housed in a wettable-flank QFN-14 (4mm × 4mm) package with exposed thermal pad, optimized for automated optical inspection (AOI) of solder joints in automotive production.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4326JGRE-AEC1, the MPQ4326GRE-AEC1 delivers superior thermal performance in a smaller footprint, while the TPS546B24AQRGZTQ1 trades off input voltage range and analog simplicity for digital configurability-making the original part irreplaceable in high-VIN automotive power stages.

Availability

MPQ4326GRE-AEC1-P is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and instrument clusters requiring stable component supply with AEC-Q100 traceability and long-term production support.

Supply support for MPQ4326GRE-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 expertise in DC/DC conversion, motor drivers, and automotive-grade solutions.

The MPQ4326 product line targets automotive power systems demanding high reliability, wide input range, and EMI robustness-designed specifically for infotainment, ADAS, and digital cluster applications operating in harsh vehicular environments.

FAQ

What is the maximum allowable input voltage for MPQ4326GRE-AEC1-P during load dump events?

The device features integrated input over-voltage protection (OVP) that clamps at 36V to 40V (typical 38V), allowing safe operation during ISO 16750-compliant 42V load dump transients without external TVS diodes. This eliminates a discrete protection component and reduces BOM cost and board area.

How does the BIAS pin reduce quiescent current, and what is the correct connection method?

Connecting the BIAS pin to a stable 5V source (e.g., VOUT of a 5V version or external LDO) reduces IQ from 24µA to 3µA in sleep mode by powering internal circuitry from a higher-efficiency rail. For non-5V outputs, connect BIAS to ground or a dedicated 5V supply-never leave it floating.

Can MPQ4326GRE-AEC1-P operate in forced continuous conduction mode (FCCM), and how is it enabled?

Yes-FCCM is activated by pulling the SYNC/MODE pin above 1.4V (e.g., to VCC) or synchronizing to an external clock (200kHz–2.5MHz). FCCM eliminates light-load frequency variation, simplifying EMI filter design and improving output voltage ripple predictability in noise-sensitive analog circuits.

What is the purpose of the two VIN pins, and how should they be decoupled?

The dual VIN pins (pins 2 and 12) are internally connected and serve to reduce package inductance and improve high-frequency decoupling. Each must have its own 10µF X5R/X7R ceramic capacitor placed as close as possible to the pin, with short, wide traces to the PGND plane beneath the thermal pad.

Does MPQ4326GRE-AEC1-P support output voltage adjustment, and what is the feedback reference voltage?

Yes-the adjustable version uses the FB pin with a 0.800V ±6mV reference (–40°C to +150°C). A resistor divider sets VOUT = 0.8V × (1 + R1/R2). Fixed-output variants (e.g., MPQ4326GRE-33-AEC1) tie FB directly to VOUT and require no external resistors.

What thermal derating applies when operating at 150°C junction temperature?

At TA = 125°C (Grade 1 ambient limit), the maximum continuous power dissipation is 2.5W (calculated as (150°C − 125°C) / 46.7°C/W). Layout must include ≥4 thermal vias under the exposed pad and 2oz copper on inner layers to sustain 6A output at high ambient temperatures.

Is the MPQ4326GRE-AEC1-P pin-compatible with other members of the MPQ4326 family?

No-MPQ4326GRE-AEC1-P (QFN-14) has a different pinout than MPQ4326JGRE-AEC1 (QFN-16), including relocated PGND, SW, and NC pins. PCB layout and schematic must be redesigned; no mechanical or electrical drop-in replacement exists within the family.