Monolithic Power Systems Inc. EVQ2483-S-00A

Overview

EVQ2483-S-00A from Monolithic Power Systems is an AEC-Q100-qualified evaluation board for the MPQ2483 55V white LED driver IC, supporting buck-boost topology with 12V input, 700mA output current across 1–4 LEDs, and programmable switching frequency up to 330kHz for automotive lighting and LCD backlight applications.

For engineers reviewing the EVQ2483-S-00A datasheet, EVQ2483-S-00A pinout, EVQ2483-S-00A application, or EVQ2483-S-00A equivalent, this board enables rapid validation of MPQ2483's analog/PWM dimming, open-string protection, thermal shutdown, and wide 4.5–55V input operation in buck-boost mode.

Technical Context

The EVQ2483-S-00A implements a non-isolated buck-boost converter using the MPQ2483 IC, which integrates a 0.28Ω internal MOSFET switch and supports both DC and PWM dimming on a single EN/DIM pin. It operates with a 0.198V reference voltage and achieves stable regulation without minimum LED string requirements.

Board-level design includes a 10μH power inductor (Wurth 744066100), low-ESR ceramic output capacitors (2.2μF/100V X7R), and discrete Schottky diodes (B360, B160) for efficient high-current LED drive at up to 2.5A peak switch current.

Key Specifications

Availability

EVQ2483-S-00A is available at Aetrix Electronics and suitable for automotive lighting validation, LCD backlight development, and industrial LED illumination projects requiring stable component supply and AEC-Q100-compliant reference designs.

Supply support for EVQ2483-S-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 MPQ2483 product line targets automotive and industrial LED lighting, delivering integrated buck-boost LED drivers with AEC-Q100 qualification, high-voltage tolerance, and dual dimming capability in SO-14 packages.

FAQ

What input voltage range is supported during evaluation?

The EVQ2483-S-00A is validated for 10–45V input per the Quick Start Guide, operating reliably across the MPQ2483's full 4.5–55V range. Input must be applied before enabling the EN/DIM signal to prevent latch-up or erratic startup behavior.

How is LED current set and verified on this board?

LED current is set by R7 (400mΩ), yielding 700mA per the 0.198V reference and I_LED = 0.198V / R7 formula. Current can be verified using the test points adjacent to R7 or by measuring voltage drop across R7 with a precision multimeter.

Can the board drive more than four LEDs?

No - the board is configured for 1–4 white LEDs (max ~16V string voltage at 3.2V/LED). Driving six LEDs (as shown in efficiency plots) requires external reconfiguration of feedback resistors and verification of thermal limits beyond the default layout.

Is PWM dimming compatible with the EN/DIM pin without additional circuitry?

Yes - the EN/DIM pin accepts direct PWM signals with logic-high >1.4V and logic-low <0.7V. No level-shifting or external pull-ups are needed, as the MPQ2483 internally thresholds the signal for seamless analog/PWM mode detection.

Does the board include thermal monitoring or reporting features?

No - while the MPQ2483 IC includes thermal shutdown protection, the EVQ2483-S-00A board lacks dedicated thermal sensors or analog output for temperature telemetry. Thermal performance must be assessed via ambient measurement and IR imaging of U1 and L1 under load.

What is the purpose of the separate input reference ground (INGND) pin?

The INGND pin isolates the input return path from the LED return (GND), preventing ground-loop noise coupling into the current-sense node. This separation maintains accuracy of the 400mΩ R7-based current regulation under dynamic load conditions.