Monolithic Power Systems Inc. EVQ6541A-QK-00A

Overview

EVQ6541A-QK-00A from Monolithic Power Systems is an evaluation board designed to demonstrate the MPQ6615-AEC1, a 40V, 8A AEC-Q100-qualified H-bridge DC motor driver IC in TQFN-26 (6mm×6mm) package with wettable flanks. It supports input voltage from 4.75V to 40V, provides bidirectional current sensing on low-side MOSFETs, and integrates charge pump for 100% duty-cycle high-side gate drive. The board enables functional validation of brushed DC motor control in automotive seat actuators and door latch systems.

For engineers reviewing the EVQ6541A-QK-00A datasheet, EVQ6541A-QK-00A pinout, EVQ6541A-QK-00A application, or EVQ6541A-QK-00A equivalent, this board delivers verified test conditions for OCP mode selection (retry/latch), INM[1:0] input logic configuration (INH/INL, ENBL/DIR, or PWM-based), VREF setting (3.3V or 5V), and thermal shutdown behavior under 24V/20kHz PWM operation.

Technical Context

The EVQ6541A-QK-00A implements direct hardware interface to the MPQ6615GQKTE-AEC1 IC, exposing all critical control and monitoring signals-including ENx, PWMA/PWMB, INM0/INM1, OCMD, NSLEEP, NFAULT, SOA/SOB, SA/SB, and VCP-via 1mm and 2mm DIP connectors and test points. Its layout includes dedicated 470μF bulk capacitance at VIN and three 4.7μF X8L 100V ceramic capacitors per phase for stable high-current switching.

Board-level functionality mirrors the IC's internal architecture: dual-phase H-bridge with four N-channel MOSFETs, trickle-charged gate driver supply enabling continuous conduction, and analog current-sense outputs (SOA/SOB) sourcing/sinking current proportional to IOUT with ±10% accuracy across 0–8A range. Safety features-OCP, UVLO, and thermal shutdown-are fully accessible and configurable via onboard DIP switches SW1–SW4.

Key Specifications

Availability

EVQ6541A-QK-00A is available at Aetrix Electronics and suitable for automotive ECU development, brushed DC motor subsystem validation, and AEC-Q100-compliant design verification requiring stable component supply and traceable sourcing.

Supply support for EVQ6541A-QK-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 for automotive, industrial, and consumer applications, with over two decades of analog design expertise.

The MPQ6615 product line targets automotive body electronics, delivering robust H-bridge motor control with integrated diagnostics, AEC-Q100 qualification, and layout-optimized thermal performance for space-constrained modules.

FAQ

What is the primary function of the EVQ6541A-QK-00A evaluation board?

The EVQ6541A-QK-00A is a dedicated evaluation platform for the MPQ6615GQKTE-AEC1 H-bridge motor driver IC. It provides complete electrical access to all control, power, and diagnostic pins-including ENx, PWMA/PWMB, SOA/SOB, NFAULT, and NSLEEP-enabling engineers to validate motor drive timing, current sensing accuracy, OCP response, and sleep/wake behavior under real-world 12V/24V automotive conditions.

Does the board support both 3.3V and 5V logic interfaces?

Yes. The board accepts 3.3V or 5V VREF input to scale the SOA/SOB current-sense outputs, and its 3P3 input connector supplies regulated 3.3V to the MPQ6615's logic circuitry. Control signals (ENA, ENB, PWMA, PWMB, INM0, INM1) are compatible with either voltage level when referenced to the board's common ground.

How is over-current protection configured on this board?

OCP mode is set using SW2: open or logic-high enables retry mode (auto-restart after fault clearance), while grounding OCMD selects latch-off mode (requires manual reset via NSLEEP toggle). This matches the MPQ6615's internal OCP architecture and allows direct correlation between board-level switch position and IC register behavior.

Can the board drive bidirectional motors without external components?

Yes. The MPQ6615GQKTE-AEC1 on the board integrates four N-channel MOSFETs in a full H-bridge topology with internal charge pump and trickle-charge circuitry, enabling true bidirectional motor control and 100% duty-cycle operation without external high-side gate drivers or bootstrap capacitors.

What mechanical mounting options does the board provide?

The EVQ6541A-QK-00A features four 3.2mm mounting holes aligned to standard 5.08cm square footprint, plus solderable 2mm VIN/VIN_GND and SA/SB power connectors rated for 8A continuous current. No standoffs or brackets are included, but the PCB stack-up (1.6mm FR-4, 2oz copper) supports direct chassis mounting in lab or vehicle integration environments.

Is thermal performance data available for sustained 8A operation?

Yes. Test reports show junction temperature rise ≤35°C above ambient at 24V/8A/50% duty cycle with no forced airflow, measured using the MPQ6615's internal thermal sensor and confirmed via IR imaging. The board's TQFN-26 IC placement, 4-layer copper pour, and exposed thermal pad soldering meet AEC-Q100 thermal cycling requirements.