Monolithic Power Systems Inc. EVQ3367-R-01A

Overview

EVQ3367-R-01A from Monolithic Power Systems is an evaluation board for the MPQ3367 6-channel boost white LED driver IC, designed to drive up to six independent LED strings (max 150mA/ch) in LCD backlight applications with 15000:1 PWM dimming ratio, I²C programmability, and peak-current-mode control architecture. It supports 3.5–36V input, delivers <50V output, and integrates phase-shift PWM dimming and comprehensive protection including OCP, OVP, OTP, and LED short/open detection.

For engineers reviewing the EVQ3367-R-01A datasheet, EVQ3367-R-01A pinout, EVQ3367-R-01A application, or EVQ3367-R-01A equivalent, this board enables rapid validation of MPQ3367-based WLED backlight designs requiring high-precision current matching (±2.5%), configurable switching frequency (up to 2.2MHz), analog/PWM/mixed dimming modes, and fault-indicator signaling.

Technical Context

The EVQ3367-R-01A implements a complete reference design for the MPQ3367 - a monolithic 6-channel boost LED driver with integrated 100mΩ/50V MOSFET, QFN-24 (4mm×4mm) package, and I²C interface. It supports three dimming modes selected via I²C or MIX/AD pin, and includes external sync (SYNC) and PWM input terminals for timing coordination.

Board-level features include VIN-to-GND input range (3.5–36V), LED+ and LED1–6 terminals for 6-string connection, EN enable control, SCL/SDA headers for I²C communication, and dedicated test points for COMP, FF, OVP, STH, FSP, SD, and PGND. Protection signals are routed to accessible pins for system-level monitoring.

Key Specifications

Availability

EVQ3367-R-01A is available at Aetrix Electronics and suitable for LCD backlight development, automotive display prototyping, and tablet/notebook display engineering requiring stable component supply, traceable evaluation hardware, and production-ready reference design validation.

Supply support for EVQ3367-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 expertise in DC/DC converters, LED drivers, motor drivers, and battery management solutions.

The MPQ3367 product line targets high-efficiency, multi-string WLED backlighting for compact displays, emphasizing precision current matching, low EMI, flexible dimming, and robust fault handling in space-constrained applications.

FAQ

What is the primary function of the EVQ3367-R-01A?

The EVQ3367-R-01A is an evaluation board-not an IC-that demonstrates the MPQ3367 6-channel boost WLED driver. It provides a fully assembled, tested platform to validate LED current regulation, dimming performance, I²C register control, and protection behavior under real-world input and load conditions.

Does the board support both analog and PWM dimming simultaneously?

Yes - the MPQ3367 on this board supports mixed dimming mode, combining analog and PWM techniques with configurable transfer points (25% or 12.5%). This is enabled via I²C register writes or the MIX/AD pin, allowing dynamic trade-offs between efficiency and dimming resolution.

How is LED current set on the EVQ3367-R-01A?

LED current per channel is set by external current-sense resistors (ISET network). The board uses R17 (24.9kΩ) and associated components to configure nominal current; actual value depends on resistor selection and is trimmed to ±2.5% matching across all six strings per MPQ3367 specification.

Can the switching frequency be adjusted, and how?

Yes - the MPQ3367 switching frequency (up to 2.2MHz) can be configured via resistor (R6 = 191kΩ sets default), I²C register, or external clock signal applied to the SYNC pin. The board includes SYNC header and routing for all three methods.

What protections are implemented and how are faults signaled?

The board implements OCP, OVP, OTP, LED short/open, and inductor short protection. Fault status is reported via the SD (Shutdown) pin and optional FAULT indicator output, both accessible on test points and headers for integration into host monitoring systems.

Is the EVQ3367-R-01A RoHS-compliant and lead-free?

Yes - all components on the EVQ3367-R-01A, including the MPQ3367GR IC, conform to RoHS directives. MPS certifies its parts as lead-free and halogen-free; full compliance documentation is available on the MPS Quality Assurance webpage.