Monolithic Power Systems Inc. MPQ4322GLE-AEC1-P

Overview

MPQ4322GLE-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified synchronous step-down converter with integrated 70mΩ/50mΩ HS/LS MOSFETs, delivering up to 2A output current across a 3.3V–36V input range and tolerating 42V automotive load dump transients. It features 1μA shutdown current, 350kHz–2.5MHz configurable switching frequency, and operates from –40°C to +150°C junction temperature - deployed in ADAS power rails and automotive infotainment systems.

For engineers reviewing the MPQ4322GLE-AEC1-P datasheet, MPQ4322GLE-AEC1-P pinout, MPQ4322GLE-AEC1-P application, or MPQ4322GLE-AEC1-P equivalent, key selection criteria include its 42V load dump tolerance, low 20μA light-load quiescent current in AAM mode, QFN-12 (3mm×4mm) wettable flank package for automotive reflow inspection, and CISPR25 Class 5 EMI compliance with FSS modulation.

Technical Context

The MPQ4322GLE-AEC1-P implements peak current mode control with frequency foldback during start-up to prevent inductor current runaway. Its integrated high-side and low-side MOSFETs enable compact layout, while the MeshConnect™ flip-chip QFN package reduces parasitic inductance and improves thermal performance.

It supports automotive cold-crank operation via high-duty-cycle LDO mode down to 3.1V VIN and includes open-drain power good (PG) monitoring with ±5.5% window (94.5%–105.5% of VREF), hiccup over-current protection, and thermal shutdown at 160°C–185°C with 20°C hysteresis.

Key Specifications

Pinout & Package

MPQ4322GLE-AEC1-P uses a QFN-12 (3mm × 4mm) package with wettable flanks, optimized for automated optical inspection (AOI) in automotive production. Thermal resistance θJA is 50°C/W (JESD51-7), and ΨJT is 1.2°C/W, enabling reliable operation up to 150°C junction temperature.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM61480-Q1 and TPS62933-Q1, MPQ4322GLE-AEC1-P uniquely balances 42V load dump immunity, ultra-low 20μA light-load IQ, and CISPR25 Class 5 compliance in a compact wettable-flank QFN - making it optimal for primary automotive buck conversion where EMI, thermal, and transient robustness are co-constrained.

Availability

MPQ4322GLE-AEC1-P is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, digital instrument clusters, and industrial telematics requiring stable component supply with AEC-Q100 qualification and long-term automotive lifecycle support.

Supply support for MPQ4322GLE-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 design centers in the US, China, and Taiwan, and global distribution through authorized partners.

The MPQ4322 belongs to MPS's automotive-grade DC/DC converter product line, engineered specifically for harsh-automotive environments - emphasizing load dump resilience, extended temperature operation, and EMI robustness in safety-critical subsystems.

FAQ

What is the maximum allowable input voltage for MPQ4322GLE-AEC1-P during load dump conditions?

The device is rated for 42V absolute maximum input voltage under automotive load dump conditions per ISO16750-2 Pulse 5a, with guaranteed operation up to 36V continuous input. This rating is validated across –40°C to +150°C junction temperature and does not require external clamping circuitry in compliant designs.

Does MPQ4322GLE-AEC1-P support adjustable output voltage, and what is the feedback reference voltage?

Yes, it supports both fixed-output (1V–5V) and adjustable configurations. The feedback reference voltage is 0.8V ±1% over –40°C to +150°C, with typical drift of ±0.5mV/°C. For adjustable use, connect FB to the center of a resistive divider between VOUT and AGND.

How is the switching frequency configured, and what resistor values correspond to common frequencies?

Frequency is set by connecting a resistor between FREQ and AGND. Typical values include 86.6kΩ for 415kHz, 34.8kΩ for 1MHz, and 15kΩ for 2.2MHz. The relationship is approximately linear across 350kHz–2.5MHz, and FSS modulation adds ±10% spread at 15kHz.

What thermal performance can be expected on a standard 4-layer PCB?

On the MPS EVQ4322-L-00A evaluation board (8.3cm×8.3cm, 2oz copper, 4-layer), case temperature rise is ≤24°C at 2A/5V out with 12V input and 415kHz fSW. θJA is 50°C/W (JESD51-7), and ΨJT is 1.2°C/W - confirming effective heat transfer through the exposed thermal pad to inner ground planes.

Is the PG (power good) signal active-high or open-drain, and what is its valid voltage window?

PG is an open-drain output requiring an external pull-up. It asserts high when VOUT is within 94.5% to 105.5% of the nominal regulated voltage (e.g., 4.725V–5.275V for 5V output). It de-asserts low if VOUT falls below 93% or exceeds 107%, with 70µs rising and 60µs falling deglitch timing.

What packaging and assembly features make MPQ4322GLE-AEC1-P suitable for automotive production?

It uses a QFN-12 (3mm×4mm) package with wettable flanks, enabling automated optical inspection (AOI) of solder joints per IPC-A-610 and automotive AEC-Q200 requirements. The MSL Level 1 rating allows unlimited floor life, and the MeshConnect™ flip-chip construction improves thermal and EMI performance.

Does MPQ4322GLE-AEC1-P include protection against short-circuit or over-temperature events?

Yes - it integrates hiccup-mode over-current protection triggered by HS peak current limit (2.7A–4.6A) and LS valley current limit (2A–3.8A), plus thermal shutdown at 160°C–185°C with 20°C hysteresis. These protections are fully functional across the full –40°C to +150°C junction temperature range.