Monolithic Power Systems Inc. EV4431-L-00A

Overview

EV4431-L-00A from Monolithic Power Systems is a fully assembled and tested evaluation board for the MP/MPQ4431GL synchronous step-down converter, delivering 3.3V at up to 1A from a 3.3V–36V input range. It implements AAM (Advanced Asynchronous Modulation) mode, supports external frequency synchronization (350kHz–2.5MHz), and includes programmable soft-start, power-good indication, and selectable forced CCM/AAM operation.

For engineers reviewing the EV4431-L-00A datasheet, EV4431-L-00A pinout, EV4431-L-00A application, or EV4431-L-00A equivalent, this board enables rapid validation of MP/MPQ4431GL performance in automotive and industrial 3.3V rail generation-especially where light-load efficiency, input voltage resilience, and EMI-controlled layout are critical.

Technical Context

The EV4431-L-00A hosts the MP/MPQ4431GL QFN-16 (3mm×4mm) IC with integrated 90mΩ high-side and 80mΩ low-side MOSFETs, enabling 1A continuous output without external power switches. Its current-mode control architecture ensures fast transient response, while the 80ns minimum on-time supports high VIN/VOUT ratios.

AAM mode dynamically scales switching frequency under light load to reduce gate-driving and switching losses, achieving <10μA quiescent current in sleep mode. The board supports external clock synchronization with in-phase or 180° out-of-phase alignment and includes an input EMI filter, output LC stage, and wettable flank package-compatible layout.

Key Specifications

Availability

EV4431-L-00A is available at Aetrix Electronics and suitable for automotive systems, industrial power supplies, and embedded control modules requiring stable component supply during prototyping and pre-production validation phases.

Supply support for EV4431-L-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 analog and power ICs, with expertise in DC/DC conversion, motor drivers, and LED lighting solutions.

The MP/MPQ4431GL product line targets automotive-grade and industrial power management applications, emphasizing wide-input operation, AEC-Q100 qualification (Grade-1), and ultra-low quiescent current for always-on systems.

FAQ

What is the purpose of the EV4431-L-00A evaluation board?

The EV4431-L-00A is a functional demonstration platform for the MP/MPQ4431GL synchronous buck regulator. It provides immediate hardware access to all key features-including AAM mode, SYNC input, soft-start, and PG signal-enabling engineers to verify electrical performance, thermal behavior, and layout best practices before custom PCB design.

How do I configure the EV4431-L-00A for forced CCM versus AAM mode?

Drive the SYNC pin high (>1.8V) before startup to enable forced continuous conduction mode (CCM); leave SYNC floating or pull it low (<0.4V) to default to AAM mode. This selection directly controls light-load efficiency trade-offs and is verified in test reports using 12V input and 3.3V/1A output conditions.

Can the output voltage be adjusted to values other than 3.3V?

Yes-the output is set by an external resistor divider (RFB1/RFB2). The board uses 41.2kΩ/13kΩ for 3.3V, but the schematic and quick start guide provide equations and recommended values for 1.8V, 2.5V, 5V, and 12V outputs. RFB1 should remain ~41.2kΩ for optimal noise immunity and bias current stability.

What input filtering is implemented on the EV4431-L-00A?

The board integrates a two-stage input EMC filter: CIN1–CIN6 (six 10μF/50V X7R ceramics) plus L1 (10μH inductor) and R5 (20Ω damping resistor). This configuration suppresses high-frequency noise and damps resonance when long input cables (>0.5m) are used-especially critical above 24V input.

Is the EV4431-L-00A still in active production?

No-Monolithic Power Systems has marked EV4431-L-00A as End of Life (EOL) and recommends migration to EVQ4431-L-00A. The original board remains available for legacy validation and reference use, but new designs should target the updated revision for long-term supply assurance and potential enhancements.

What thermal performance can be expected during 1A continuous operation?

At 12V input, 3.3V/1A output, and 25°C ambient, the MP/MPQ4431GL junction temperature rise is ≤25°C above ambient per thermal imaging data in the official test report. The board's 2-layer copper pour and QFN-16 thermal pad layout meet AEC-Q100 Grade-1 reliability requirements for sustained operation.