Monolithic Power Systems Inc. EVQ2489-Q-00A

Overview

EVQ2489-Q-00A from Monolithic Power Systems is an evaluation board for the MPQ2489DQ step-down white LED driver IC, supporting 8–36V input (up to 60V with B190 diode swap), delivering 500mA constant LED current in continuous conduction mode, with hysteretic control and 200mV feedback voltage for high efficiency in automotive and general illumination applications.

For engineers reviewing the EVQ2489-Q-00A datasheet, EVQ2489-Q-00A pinout, EVQ2489-Q-00A application, or EVQ2489-Q-00A equivalent, this board enables rapid validation of MPQ2489DQ-based LED driver designs-including PWM/analog dimming, thermal shutdown behavior, and wide-input operation under real load conditions.

Technical Context

The EVQ2489-Q-00A implements the MPQ2489DQ's hysteretic control architecture, eliminating loop compensation while achieving fast transient response and stable current regulation via high-side sensing across R1 (0.4Ω). It supports dual dimming modes: PWM (1000:1 resolution) and analog, controlled through the DIM pin.

Input range spans 9–24V nominal (extendable to 60V), output voltage remains below VIN−3V, and thermal shutdown + UVLO protect against overtemperature and undervoltage faults. Board-level components include TDK VLS4012ET-100M-CA (10µH) and VLCF5028T-680MR40-2 (68µH) inductors, plus Murata GRM-series ceramic capacitors.

Key Specifications

Availability

EVQ2489-Q-00A is available at Aetrix Electronics and suitable for automotive LED lighting, emergency signage, low-voltage halogen replacement, and industrial decorative illumination requiring stable component supply and validated reference design support.

Supply support for EVQ2489-Q-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 core expertise in DC/DC conversion, LED drivers, and motor control solutions.

The MPQ2489 product line targets high-efficiency, wide-input LED driver applications-designed specifically for automotive cabin lighting, architectural accent lighting, and safety-critical signage where reliability, dimming fidelity, and thermal robustness are essential.

FAQ

What is the maximum input voltage supported by the EVQ2489-Q-00A without modification?

The board supports 9–24V nominal input per its electrical specifications. The underlying MPQ2489DQ IC tolerates up to 60V, but the default B140 diodes (D1–D5) are rated only to 40V PIV; using B190 diodes enables full 60V operation as documented in the schematic revision notes.

How is LED current set on this evaluation board?

LED current is set by the parallel resistance of R1 (0.4Ω) and optional R2 (NC by default), following I_LED = 200mV / R_sense. With R1 only, I_LED = 500mA. Adding R2 in parallel lowers R_sense, increasing current-e.g., 0.2Ω total yields 1A.

Does the EVQ2489-Q-00A support both PWM and analog dimming simultaneously?

No-the DIM pin accepts either PWM signal (0–100% duty cycle) or analog voltage (0–1.2V) to control brightness, but not both concurrently. The MPQ2489DQ internally selects mode based on signal characteristics; simultaneous application may cause undefined behavior per the IC's functional description.

What is the purpose of L2 (68µH) on the board?

L2 serves as the main output filter inductor for the buck converter stage, working with C2/C3 to smooth the switched LED current. Its 68µH value-paired with the MPQ2489DQ's hysteretic control-ensures stable CCM operation and low ripple (<10% peak-to-peak) at 500mA with typical LED string configurations.

Can the EVQ2489-Q-00A drive more than three LEDs in series?

Yes-output voltage is limited to VIN − 3V, so with 24V input, up to ~21V is available for the LED string. Assuming 3.2V per white LED, up to six LEDs (19.2V) can be driven safely; thermal performance and efficiency must be verified per actual layout and ambient conditions.

Is the board RoHS-compliant and lead-free?

Yes-per Monolithic Power Systems' declaration, all components on EVQ2489-Q-00A, including the MPQ2489DQ IC, Murata capacitors, TDK inductors, and Diodes Inc. B140, meet RoHS Directive requirements and are lead-free and halogen-free.