Monolithic Power Systems Inc. EV2489DQ-01A

Overview

EV2489DQ-01A from Monolithic Power Systems is an evaluation board for the MP2489DQ step-down white LED driver IC, supporting 8–36V input and delivering regulated 350mA LED current via high-side current sensing. It implements hysteretic control with 200mV feedback voltage, enabling fast transient response without loop compensation, and supports both PWM (1000:1 resolution) and analog dimming for high-brightness LED arrays in automotive and signage applications.

For engineers reviewing the EV2489DQ-01A datasheet, EV2489DQ-01A pinout, EV2489DQ-01A application, or EV2489DQ-01A equivalent, this board provides validated reference design, BOM traceability, thermal performance data, and dimming interface configuration guidance for MP2489DQ-based LED driver implementations.

Technical Context

The EV2489DQ-01A implements a continuous-conduction-mode buck converter topology using the MP2489DQ IC, which integrates a 65V internal MOSFET and operates with hysteretic current-mode control. Input range is 8–36V (extendable to 60V with B190 diodes), output voltage remains below VIN−3V, and LED current regulation accuracy relies on external R1//R2 sensing network referenced to 200mV.

Dimming is implemented via the EN/DIM pin: PWM signals (200Hz–2kHz) enable digital brightness control, while 0.3–2.5V analog voltage applied after modifying R3/R4/R6 enables linear current scaling. Protection includes under-voltage lockout and thermal shutdown.

Key Specifications

Availability

EV2489DQ-01A is available at Aetrix Electronics and suitable for LED lighting development, automotive interior illumination prototyping, and emergency signage power supply validation requiring stable component supply and pre-validated thermal and electrical performance.

Supply support for EV2489DQ-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 analog and power ICs, with core expertise in DC/DC conversion, LED drivers, and motor control solutions.

The MP2489DQ product line targets high-efficiency, wide-input-range constant-current LED drivers for automotive, industrial, and architectural lighting where reliability, dimming fidelity, and thermal robustness are critical.

FAQ

What is the purpose of the EV2489DQ-01A evaluation board?

The EV2489DQ-01A is a fully assembled, tested reference design for the MP2489DQ step-down white LED driver IC. It enables rapid validation of LED current regulation, dimming functionality, thermal behavior, and PCB layout practices under real-world 8–36V input conditions before custom design integration.

How do I configure analog dimming on this board?

To enable analog dimming, open jumper R4 and short R6, then apply 0.3–2.5V DC to the EN/DIM pin. This voltage linearly scales the LED current setpoint derived from the 200mV reference across R1//R2, allowing smooth brightness control without PWM artifacts.

Can the input voltage exceed 36V?

Yes-the board supports up to 60V input by replacing the B140 Schottky diodes (D1–D5) with B190 diodes, as specified in the schematic revision notes. The MP2489DQ IC itself is rated for 65V internal MOSFET drain-source voltage.

What is the role of R1 and R2 in current setting?

R1 (1Ω) and R2 (1.3Ω) are placed in parallel to form the high-side current sense resistor. Their combined resistance (≈0.565Ω) sets the LED current to 350mA using the formula I_LED = 0.2V / (R1∥R2), per the MP2489DQ's 200mV current-sense reference voltage.

Does the board include thermal protection verification?

Yes-the EV2489DQ-01A implements the MP2489DQ's integrated thermal shutdown circuitry. When die temperature exceeds safe limits, the IC disables switching and automatically resumes operation once cooled, and this behavior is observable during sustained high-power LED loading tests.