Monolithic Power Systems Inc. MPQ4320CGDE-AEC1-P

Overview

MPQ4320CGDE-AEC1-P from Monolithic Power Systems is an AEC-Q100 Grade 1 qualified, synchronous step-down DC/DC converter optimized for automotive power rails. It delivers up to 0.5A output current with 3.3V–36V input range, 42V load dump tolerance, 1μA shutdown current, and configurable switching frequency (350kHz–2.5MHz) in a QFN-12 (2mm×3mm) wettable flank package. It supports cold-crank operation down to 3.1V and integrates 70mΩ HS-FET and 50mΩ LS-FET.

For engineers reviewing the MPQ4320CGDE-AEC1-P datasheet, MPQ4320CGDE-AEC1-P pinout, MPQ4320CGDE-AEC1-P application, or MPQ4320CGDE-AEC1-P equivalent, key selection criteria include automotive-grade thermal robustness (−40°C to +150°C TJ), CISPR25 Class 5 EMI compliance, low-dropout mode for cold-crank, and integrated power-good signaling with ±1.5% threshold hysteresis.

Technical Context

This buck converter uses peak current mode control with frequency foldback during startup to prevent inductor current runaway. Its dual VIN pins reduce high-frequency switching noise coupling, while symmetric VIN pinout and spread-spectrum modulation suppress conducted and radiated EMI per CISPR25 Class 5.

The device implements forced continuous conduction mode (FCCM), hiccup over-current protection, and thermal shutdown at 160°C–185°C with 20°C hysteresis. Low-dropout (LDO) mode enables regulation when VIN approaches VOUT, critical for automotive cold-crank where input drops to 3.1V while maintaining stable 3.3V or 5V rail output.

Key Specifications

Pinout & Package

MPQ4320CGDE-AEC1-P is housed in a QFN-12 (2mm × 3mm) package with wettable flanks for automated optical solder-joint inspection. The thermally enhanced flip-chip construction (MeshConnect™) improves thermal resistance (θJA = 60°C/W on JEDEC board; 35.5°C/W on MPS EVB).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ4320CGDE-AEC1-P, the CGLE variant trades footprint for thermal headroom, while the TPS62933-Q1 offers higher current but fails to meet ISO 16750 load dump or cold-crank specs - making MPQ4320CGDE-AEC1-P uniquely suited for compact, full-spec automotive front-end rails.

Availability

MPQ4320CGDE-AEC1-P is available at Aetrix Electronics and suitable for automotive infotainment, instrument clusters, and ADAS camera modules requiring stable component supply across extended temperature and transient-voltage conditions.

Supply support for MPQ4320CGDE-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 for automotive, industrial, and consumer markets.

The MPQ4320C product line delivers AEC-Q100 qualified buck converters engineered specifically for automotive subsystems demanding load dump resilience, cold-crank operation, and EMI-compliant compact power conversion.

FAQ

What is the minimum input voltage required to start up the MPQ4320CGDE-AEC1-P?

The device requires a minimum VIN of 3.9V to initiate startup, as defined by its UVLO rising threshold. Once running, it sustains regulation down to 3.1V (UVLO falling threshold), enabling operation during automotive cold-crank events without dropout.

Does MPQ4320CGDE-AEC1-P support adjustable output voltage?

Yes - the MPQ4320CGDE-AEC1-P is the adjustable-output version. Output voltage is set via an external resistor divider from VOUT to AGND connected to the FB pin, with a 0.8V internal reference. Fixed-output variants (e.g., 3.3V, 5V) use internal feedback and connect FB directly to VOUT.

How is EMI performance achieved without external filters?

EMI suppression relies on integrated features: frequency spread spectrum (±10% modulation), symmetric VIN pinout to cancel common-mode noise, MeshConnect™ flip-chip packaging for low-inductance power loops, and optimized internal gate drive timing - all validated to CISPR25 Class 5 with minimal external components.

What is the purpose of the dual VIN pins (pins 2 and 10)?

Pins 2 and 10 are internally connected input supply terminals. Their separation minimizes high-frequency switching current loop area and reduces magnetic field radiation. Each requires a local high-frequency ceramic decoupling capacitor to PGND to suppress voltage spikes induced by fast di/dt transitions.

Can the PG pin be left unconnected if not used?

No - the PG pin is open-drain and must be either pulled up to a valid logic voltage (e.g., VOUT) via a resistor or actively driven. Leaving it floating may cause undefined system behavior during power sequencing; if unused, tie it to AGND through a 100kΩ resistor to ensure known state.

Is thermal derating required above 25°C ambient?

Yes - maximum output current decreases with rising ambient temperature due to junction temperature limits (150°C max). At TA = 85°C, continuous output current is reduced to ~0.35A for the QFN-12 (2mm×3mm) package on a standard 4-layer board, based on θJA = 60°C/W and thermal shutdown threshold.

What does "wettable flank" mean for this package?

Wettable flanks refer to vertical sidewalls of the QFN package that are metallized and solderable. This enables automated optical inspection (AOI) of solder joint quality on all perimeter leads - a mandatory requirement for automotive AEC-Q200-compliant assembly and long-term field reliability validation.