Monolithic Power Systems Inc. EVQ4314-R-01A

Overview

EVQ4314-R-01A from Monolithic Power Systems is a fully assembled and tested evaluation board for the MPQ4314GRE-AEC1 synchronous step-down converter, designed to demonstrate 45V input, 4A output capability with AEC-Q100 Grade 1 qualification. It supports configurable switching frequency (410 kHz default), frequency spread spectrum, and automotive cold-crank operation via high-duty-cycle/LDO mode. The board delivers 3.3V/4A output with 93.1% efficiency at 12V_IN, targeting automotive power rail validation.

For engineers reviewing the EVQ4314-R-01A datasheet, EVQ4314-R-01A pinout, EVQ4314-R-01A application, or EVQ4314-R-01A equivalent, this board enables rapid functional verification of MPQ4314's AAM/FCCM modes, SYNC input synchronization (350–1000 kHz), soft-start timing (1.63 ms), and PG signal behavior under load transients and cold-crank conditions.

Technical Context

The EVQ4314-R-01A implements the MPQ4314GRE-AEC1 IC in QFN-20 (4mm × 4mm) wettable flank package, featuring integrated high-side and low-side MOSFETs, current-mode control, and dual operating modes: Auto-Audio Mode (AAM) for ultra-low quiescent current (1.7 µA shutdown) and Forced Continuous Conduction Mode (FCCM) for fixed-frequency stability. It includes dedicated test points for VEMI, VOUT, EN, SYNCIN, SYNCO, and PG signals.

Board-level features include input EMI filtering (MPZ2012S300AT000 bead + CIN1–CIN5), output capacitance (2 × 47 µF ceramic), 4.7 µH power inductors (L2/L3), and resistor-programmable feedback (R7/R8) and frequency (R3). Thermal performance is validated up to 4A load with ≤20°C case temperature rise at 25°C ambient.

Key Specifications

Availability

EVQ4314-R-01A is available at Aetrix Electronics and suitable for automotive ADAS power validation, infotainment subsystem prototyping, and body electronics design requiring stable component supply and AEC-Q100-compliant reference hardware.

Supply support for EVQ4314-R-01A 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 applications, with core expertise in DC/DC conversion and motor drivers.

The MPQ4314 product line targets automotive power systems requiring high-voltage tolerance, low IQ, and AEC-Q100 compliance-designed specifically for camera modules, radar sensors, and telematics control units operating across wide input ranges.

FAQ

What input voltage range does the EVQ4314-R-01A support?

The board accepts 3.3V to 45V DC input, enabling validation of cold-crank (down to 3.3V) and load-dump (up to 45V) scenarios per ISO 16750-2. Input filtering includes an EMI bead (MPZ2012S300AT000) and bulk aluminum capacitor (EEHZA1J470P) to suppress transients.

How is output voltage configured on this evaluation board?

VOUT is set to 3.3V by default using R7 = 100 kΩ and R8 = 32.4 kΩ (1%) resistors per Equation (1): R8 = R7 × (VOUT / 0.815 V − 1). The FB pin connects to this divider; changing R7/R8 allows adjustment to other outputs like 5V (R8 = 19.1 kΩ).

Does the board support external clock synchronization?

Yes - the SYNCIN pin accepts 350 kHz to 1000 kHz external clocks to synchronize switching edges, reducing EMI peak emissions. The SYNCO pin outputs the internal clock for daisy-chaining or measurement, verified in test waveforms up to 1 MHz.

What protection features are demonstrated on this board?

The board validates thermal shutdown, overcurrent protection (SCP entry/recovery within 20 ms), and power-good (PG) signaling. PG asserts high when VOUT is within −7% to +6% of regulation and deasserts during faults or startup/shutdown sequences.

Is the MPQ4314 IC on this board AEC-Q100 qualified?

Yes - the mounted IC is MPQ4314GRE-AEC1, qualified to AEC-Q100 Grade 1 (−40°C to +125°C junction temperature), with wettable flank QFN-20 packaging for automated optical inspection (AOI) in automotive manufacturing.

Can I operate the board in both AAM and FCCM modes?

Yes - MODE pin (JP1 pins 2–1 for AAM, 2–3 for FCCM) selects between Auto-Audio Mode (ultra-low IQ, variable frequency) and Forced CCM (fixed frequency, lower noise). Both modes are characterized in efficiency curves and transient response waveforms.

What is included in the bill of materials for this board?

The BOM lists all components: MPQ4314GRE-AEC1 IC, Murata/TDK/Yageo passives (GRM/GRM32E/C3216X7R/RC0603FR series), Coilcraft/Cyntec inductors (XAL6060-472MEC/VCMT063T-4R7MN5T), and custom test pins. Full part numbers and footprints are provided in Table 1 on page 5.