Monolithic Power Systems Inc. EVQ4436A-R-00A

Overview

EVQ4436A-R-00A from Monolithic Power Systems is a fully assembled, tested evaluation board for the MPQ4436A-AEC1 synchronous step-down converter, delivering 3.3V/6A output from a 3.3–45V input, featuring AEC-Q100 Grade 1 qualification, programmable 350–530kHz switching frequency, and low 1.7μA shutdown current - designed for automotive infotainment, clusters, and ADAS power rail validation.

For engineers reviewing the EVQ4436A-R-00A datasheet, EVQ4436A-R-00A pinout, EVQ4436A-R-00A application, or EVQ4436A-R-00A equivalent, this board enables rapid functional verification of MPQ4436A's cold-crank operation, frequency synchronization, power-good signaling, FCCM/AAM mode selection, and low-EMI spread-spectrum performance under real-world load and input transients.

Technical Context

The EVQ4436A-R-00A implements the MPQ4436A-AEC1 IC in QFN-20 (4mm×4mm) wettable flank package, with integrated 48mΩ high-side and 20mΩ low-side MOSFETs, supporting both Advanced Asynchronous Mode (AAM) and Forced Continuous Conduction Mode (FCCM) via JP1 jumper configuration. It includes external soft-start (10nF → 1.6ms), selectable feedback resistor network (R5/R6 = 100kΩ/31.6kΩ for 3.3V), and SYNCIN/SYNCO pins for multi-phase clock coordination.

Board-level design incorporates dual-stage input EMI filtering (CIN1–CIN11 + L1 bead), optimized thermal layout with exposed PGND/VIN copper pours, and test points for VEMI, VOUT, EN, SYNCIN, PG, SYNCO, and ICS. It validates critical automotive behaviors: low-dropout operation at VIN = 3.3V, load dump survival (12V→36V), cold crank (VIN ramp 12V→3.3V→5V), and hiccup-mode over-current protection recovery.

Key Specifications

Availability

EVQ4436A-R-00A is available at Aetrix Electronics and suitable for automotive infotainment system development, digital instrument cluster prototyping, and ADAS domain controller power architecture validation requiring stable component supply and pre-validated thermal/EMI performance.

Supply support for EVQ4436A-R-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MPQ4436A product line targets automotive-grade DC/DC conversion, specifically engineered for harsh-environment applications demanding AEC-Q100 Grade 1 reliability, wide-input operation, and robust transient response in infotainment, cluster, and ADAS subsystems.

FAQ

What is the default output voltage and how is it set?

The EVQ4436A-R-00A is factory-configured for 3.3V output using a precision resistor divider (R5 = 100kΩ, R6 = 31.6kΩ) on the FB pin. This ratio yields VOUT = 0.815V × (1 + R5/R6) = 3.3V, with ±1% tolerance confirmed across temperature and load per test reports.

How do I switch between AAM and FCCM modes?

Mode selection is hardware-controlled via JP1: connect pins 1–2 for Advanced Asynchronous Mode (AAM), or pins 2–3 for Forced Continuous Conduction Mode (FCCM). No register writes or external signals are required - the jumper directly configures the MPQ4436A's internal control logic.

Does the board support external clock synchronization?

Yes - apply a 350kHz to 530kHz square wave to the SYNCIN pin (U1 Pin 2) to align the MPQ4436A's internal oscillator rising edge. The board also provides a phase-shifted SYNCO output (U1 Pin 13) for multi-phase interleaving with up to two additional converters.

What is the purpose of the "ICS" test point?

ICS (Current Sense) is a dedicated test point connected to the internal current-sense amplifier output of the MPQ4436A (U1 Pin 15), enabling direct oscilloscope measurement of inductor current waveform without intrusive shunt insertion - critical for loop stability and OCP characterization.

Can the board operate during automotive cold-crank conditions?

Yes - the MPQ4436A IC implements low-dropout mode, and the board has been validated down to VIN = 3.3V while maintaining regulated 3.3V output at 6A. Test waveforms (page 14) confirm stable startup and regulation during VIN ramp from 3.3V to 5V under full load.

Is AEC-Q100 qualification applicable to the evaluation board itself?

No - AEC-Q100 Grade 1 qualification applies only to the MPQ4436A-AEC1 IC (U1), not the PCB assembly. However, the EVQ4436A-R-00A board uses automotive-grade passives (e.g., Murata GRM X7R/X5R, Panasonic aluminum caps) and layout practices aligned with automotive reliability requirements.