Monolithic Power Systems Inc. EVQ4322-D-00A

Overview

EVQ4322-D-00A from Monolithic Power Systems is a fully assembled and tested evaluation board for the MPQ4322 AEC-Q100-qualified synchronous step-down converter, supporting 3.3V–36V input, 5V/2A output, 42V load dump tolerance, and 2.2MHz switching frequency. It demonstrates cold-crank operation, frequency foldback, power-good signaling, and ultra-low 1μA shutdown current in automotive power supply validation.

For engineers reviewing the EVQ4322-D-00A datasheet, EVQ4322-D-00A pinout, EVQ4322-D-00A application, or EVQ4322-D-00A equivalent, this board enables rapid characterization of MPQ4322's efficiency (92.3% at 12V→5V/2A), thermal performance (37.8°C rise at 2A), CISPR 25 Class 5 EMI compliance, and low-dropout mode under 3.3V input.

Technical Context

The EVQ4322-D-00A implements the MPQ4322 IC in QFN-12 (2mm×3mm) package with wettable flanks, integrating high-side and low-side MOSFETs, peak current mode control, and programmable switching frequency (350kHz–2.5MHz via external resistor). It supports configurable output voltage (1V–5V) using an external resistor divider and includes dedicated test points for VEMI, VOUT, EN, PG, and FREQ.

Board-level features include dual-output capability (3.3V and 5V presets), EMI filtering (magnetic bead FB1 + CIN1–CIN4), thermal management via 2oz copper layers, and validated layout for automotive-grade transient immunity-demonstrating load dump survival (12V→42V), cold crank (3.3V input), and SCP recovery without latch-off.

Key Specifications

Availability

EVQ4322-D-00A is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, infotainment head units, body control modules, and telematics gateways requiring stable component supply, AEC-Q100-compliant reference validation, and fast-turn design verification.

Supply support for EVQ4322-D-00A 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 converters, motor drivers, and battery management solutions for automotive, industrial, and computing markets.

The MPQ4322 product line targets automotive power conversion applications demanding high reliability, wide input range, and robust transient immunity-specifically engineered for front-end DC/DC regulation in 12V/24V vehicle systems subject to load dump and cold-crank stress.

FAQ

What input voltage range does the EVQ4322-D-00A support during evaluation?

The board accepts 3.3V to 36V DC input, verified across cold-crank (3.3V), nominal (12V/24V), and load dump (up to 42V transient) conditions. Input terminals are labeled VEMI and GND, with damping capacitor guidance provided for cables >0.5m at VIN ≥24V.

How is output voltage configured on the EVQ4322-D-00A?

VOUT is set via external resistor divider networks: R5 = 100kΩ (fixed), R6 = 31.6kΩ for 3.3V or 19.1kΩ for 5V. Jumpers allow selection between presets; Equation (1) in the quick start guide enables calculation for other voltages (e.g., 2.5V, 1.8V).

Does the board provide access to all MPQ4322 control signals?

Yes - test points and 1mm golden-pin headers expose EN (enable), PG (power good), FREQ (frequency setting), FB (feedback), BOOT, SW, and AGND/PGND. The schematic (Figure 3) confirms direct routing from U1 pins to accessible nodes.

What thermal data is available for the EVQ4322-D-00A under full load?

At 2A output, 12V input, and no forced airflow, the board achieves 37.8°C case temperature rise above ambient (TA = 25°C), measured per Figure 8. This validates thermal design using the QFN-12 package's wettable flanks and 2oz PCB copper layers.

Can the EVQ4322-D-00A demonstrate CISPR 25 Class 5 EMI performance?

Yes - test reports (pages 10–11) confirm compliance for peak/average conducted emissions (150kHz–108MHz) and radiated emissions (150kHz–1GHz, horizontal/vertical polarization), achieved via integrated EMI filter (FB1 + CIN1–CIN4) and optimized layout.

Is the board compatible with standard oscilloscope probing and load equipment?

Yes - it includes dedicated Kelvin-sense test points (VOUT, VEMI, PG), banana jack-compatible terminals for input/output, and clearly labeled ground references (GND, AGND, PGND). Figure 2 details measurement setup with recommended cabling and damping practices.