Monolithic Power Systems Inc. MPQ4322GDE-AEC1-Z

Overview

MPQ4322GDE-AEC1-Z from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, 42V load dump tolerant, 2A synchronous step-down converter with integrated 70mΩ/50mΩ MOSFETs, 3.3V–36V input range, and ultra-low 1μA shutdown current. It delivers high efficiency across load conditions via frequency foldback and advanced asynchronous modulation (AAM), and supports automotive cold-crank operation down to 3.1V VIN. It is deployed in ADAS power rails requiring robust transient immunity and low quiescent power.

For engineers reviewing the MPQ4322GDE-AEC1-Z datasheet, MPQ4322GDE-AEC1-Z pinout, MPQ4322GDE-AEC1-Z application, or MPQ4322GDE-AEC1-Z equivalent, key selection criteria include 42V load dump tolerance, 1μA ISD, 65ns tON_MIN, CISPR25 Class 5 EMI compliance, and QFN-12 (2mm×3mm) wettable flank package suitability for automotive PCB assembly and thermal management.

Technical Context

The MPQ4322GDE-AEC1-Z implements peak current mode control with configurable switching frequency (350kHz–2.5MHz) set via external resistor on FREQ pin. Its integrated HS/LS MOSFETs enable compact layout, while frequency spread spectrum (FSS) and symmetric VIN pinout reduce conducted/radiated EMI per CISPR25 Class 5 requirements.

It features dual protection modes: hiccup over-current protection with 2.7A–4.6A HS peak limit and 2A–3.8A LS valley limit, plus thermal shutdown at 160°C–185°C with 20°C hysteresis. Low-dropout (LDO) mode sustains regulation during cold-crank, and open-drain PG output monitors VOUT within ±5.5% nominal with 1.5% hysteresis.

Key Specifications

Pinout & Package

MPQ4322GDE-AEC1-Z uses a QFN-12 (2mm × 3mm) package with wettable flanks for automated optical inspection (AOI) and enhanced solder joint reliability in automotive reflow processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4322GLE-AEC1-Z, the GDE variant offers superior board-area efficiency and identical electrical specs but lower thermal dissipation; versus TPS62933RTER, it trades off ultra-low ISD for mandatory 42V load dump tolerance and AEC-Q100 qualification required in primary automotive power domains.

Availability

MPQ4322GDE-AEC1-Z is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and instrument cluster designs requiring stable component supply with full AEC-Q100 traceability and long-term automotive lifecycle support.

Supply support for MPQ4322GDE-AEC1-Z 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.

The MPQ4322 product line targets automotive power conversion with emphasis on load dump resilience, ultra-low IQ, and EMI-hardened integration-enabling compact, reliable DC/DC solutions for ASIL-B systems.

FAQ

What is the minimum input voltage required for startup and sustained operation?

The MPQ4322GDE-AEC1-Z has a VIN UVLO rising threshold of 3.65V (typical), so startup requires ≥3.65V. After startup, it operates down to 3.1V VIN in low-dropout mode-critical for automotive cold-crank scenarios where battery voltage dips below 6V.

Does this device support adjustable output voltage, and what is the feedback reference accuracy?

Yes, the MPQ4322GDE-AEC1-Z supports adjustable output via external resistor divider on FB. The internal reference is 0.8V with ±1% tolerance over –40°C to +150°C, enabling precise regulation across automotive temperature extremes.

How is EMI performance validated, and what test conditions apply?

EMI performance is validated per CISPR25 Class 5 using the typical application circuit (Figure 1) with specified EMI filters. Peak and average conducted/radiated emissions were measured on a standardized test bench meeting ISO 7637-2 and CISPR25 requirements.

What package-related benefits does the wettable flank QFN-12 offer for automotive manufacturing?

The wettable flank structure enables automated optical inspection (AOI) of solder joints on all 12 perimeter leads, improving process yield and field reliability in high-volume automotive SMT lines-especially critical for under-hood modules subject to thermal cycling.

Can the PG pin be left floating if not used in the system?

No-PG is an open-drain output and must be either pulled up to a valid logic voltage (e.g., VCC or 3.3V) via a resistor or actively driven. Floating PG may cause undefined logic states and interfere with system power sequencing or fault reporting.

What is the maximum achievable switching frequency, and how is it set?

The maximum switching frequency is 2.5MHz, achieved by connecting a 15kΩ resistor between FREQ and AGND. Frequency scales inversely with resistor value: 86.6kΩ yields ~415kHz, 34.8kΩ yields ~1MHz, and 15kΩ yields ~2.2MHz (typical).

Is thermal derating required for continuous 2A output in the QFN-12 (2mm×3mm) package?

Yes-thermal derating is necessary. With θJA = 60°C/W and TJ(max) = 150°C, maximum ambient temperature for full 2A operation is ~105°C (assuming TA = 85°C, PD ≈ 0.5W → ΔT = 30°C). For sustained 2A at 85°C ambient, use forced air or copper pour to reduce effective θJA.