Monolithic Power Systems Inc. EVQ4317-R-01A

Overview

EVQ4317-R-01A from Monolithic Power Systems is a fully assembled and tested evaluation board for the MPQ4317 AEC-Q100 Grade 1 qualified synchronous step-down converter, supporting 3.3V–45V input, delivering up to 7A at 3.3V or 5V output, with 410kHz switching frequency, 1.7μA shutdown quiescent current, and frequency spread spectrum for EMI reduction.

For engineers reviewing the EVQ4317-R-01A datasheet, EVQ4317-R-01A pinout, EVQ4317-R-01A application, or EVQ4317-R-01A equivalent, this board enables rapid validation of automotive-grade DC/DC conversion in cold-crank, load-dump, and CISPR25 Class 5 EMI-compliant designs - with configurable FREQ, SYNCIN, EN, and PG signals, plus external resistor-set VOUT.

Technical Context

The EVQ4317-R-01A implements the MPQ4317 IC in QFN-20 (4mm×4mm) wettable flank packaging, featuring integrated high-side and low-side MOSFETs, current-mode control, and dual operating modes: Auto-Audio Mode (AAM) for ultra-low IQ at light loads and Forced Continuous Conduction Mode (FCCM) for fixed-frequency stability. It supports programmable switching frequency (350–1000kHz via SYNCIN) and resistor-configurable fSW (via R3 on FREQ pin).

Board-level features include input EMI filtering (L1, CIN1–CIN5), output LC filtering (L2/L3, C2A/C2B), soft-start timing (22nF CSS → 1.63ms), power-good monitoring (PG pin), and thermal management validated up to 7A with ≤70°C case rise. It meets CISPR25 Class 5 conducted/radiated emissions limits in both horizontal and vertical polarizations.

Key Specifications

Availability

EVQ4317-R-01A is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, infotainment head units, and body electronics requiring stable component supply, AEC-Q100 validation support, and fast-turn DC/DC design verification.

Supply support for EVQ4317-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, with design centers in the US, China, and Taiwan, and global distribution through authorized partners.

The MPQ4317 product line targets automotive power conversion applications, delivering robust, AEC-Q100 qualified buck regulators optimized for wide VIN range, low IQ, EMI resilience, and cold-crank operation in harsh environments.

FAQ

What input voltage range does the EVQ4317-R-01A support?

The board supports 3.3V to 45V DC input, enabling direct testing under automotive battery conditions - including cold-crank (down to 3.3V with dropout mode active) and load-dump transients (up to 45V). Input filtering uses an EMI bead (L1) and five ceramic/aluminum capacitors (CIN1–CIN5) for robust noise suppression.

How is output voltage set on this evaluation board?

VOUT is set by an external resistor divider (R7 = 100kΩ, R8 = 32.4kΩ) connected to the FB pin, yielding 3.3V. To change output voltage, replace R8 per Equation (1): R8 = R7 × (VOUT / 0.815V − 1). For 5V output, R8 = 19.1kΩ (1% tolerance) is recommended and validated in Table 1.

Does the board support synchronization to an external clock?

Yes - the SYNCIN pin accepts 350kHz to 1000kHz external clocks to synchronize switching edges, reducing beat frequencies and improving EMI predictability. The SYNCO pin provides a buffered copy of the internal oscillator for daisy-chaining multiple converters, verified at 350kHz and 530kHz in test waveforms.

What protection features are implemented and verified?

The board demonstrates thermal shutdown, overcurrent protection (SCP entry/recovery within 20ms), input undervoltage lockout (UVLO), and power-good (PG) signaling. PG asserts high when VOUT is within −7% to +6% of target, validated during startup/shutdown and transient events across 0–7A load steps.

Is the board compliant with automotive EMI standards?

Yes - the EVQ4317-R-01A passes CISPR25 Class 5 requirements for both conducted (150kHz–108MHz) and radiated emissions (150kHz–1GHz, horizontal/vertical polarization), as confirmed in Figures 11–16. Layout follows 2oz copper, optimized layer stack-up, and strategic component placement per MPS reference design guidelines.

Can I modify the switching frequency without changing hardware?

Yes - frequency is configurable via the FREQ pin using resistor R3 (default 75kΩ sets 410kHz), or dynamically overridden via SYNCIN. Figure 1 provides the RFREQ vs. fSW relationship; swapping R3 to 12kΩ raises fSW to ~1.8MHz, enabling optimization for size vs. efficiency trade-offs.