Monolithic Power Systems Inc. EV24895-Q-00A

Overview

EV24895-Q-00A from Monolithic Power Systems is an evaluation board for the MP24895GQ step-down white LED driver IC, supporting 9–30V input and delivering up to 1A constant LED current via high-side current-sense resistor feedback with 100mV reference voltage. It implements hysteretic control architecture, enables simultaneous PWM and analog dimming on the EN/DIM pin, and integrates UVLO and thermal shutdown protection.

For engineers reviewing the EV24895-Q-00A datasheet, EV24895-Q-00A pinout, EV24895-Q-00A application, or EV24895-Q-00A equivalent, this board provides validated reference design, quick-start dimming configuration guidance (PWM/Analog), and full BOM traceability for LED driver development targeting automotive, signage, and low-voltage general illumination systems.

Technical Context

The EV24895-Q-00A implements a fixed-frequency hysteretic current-mode buck converter topology using the MP24895GQ IC, which regulates LED current without external compensation components. Its control loop relies on instantaneous inductor current sensing through R1/R2 (0.2Ω parallel) and compares against a 100mV threshold to toggle the internal 36V MOSFET switch.

Dimming is implemented via a single EN/DIM pin accepting either 200Hz–2kHz PWM signals (1000:1 resolution) or 0.3–2.5V analog voltage inputs. The board includes discrete Schottky diodes (B260A), a 47µH power inductor, and input/output capacitors sized for stable operation across 9–30V input range and ≤1A output load.

Key Specifications

Availability

EV24895-Q-00A is available at Aetrix Electronics and suitable for LED driver validation, automotive interior lighting qualification, and low-voltage halogen lamp replacement projects requiring stable component supply and rapid functional verification.

Supply support for EV24895-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 expertise in DC/DC conversion, LED drivers, motor drivers, and battery management solutions.

The MP24895 product line delivers high-efficiency, thermally robust step-down LED drivers for wide-input industrial and automotive lighting applications, emphasizing simplicity (no loop compensation), precision current regulation, and dual-dimming flexibility.

FAQ

What input power sources are compatible with the EV24895-Q-00A?

The board accepts 9–30V DC or AC directly at the AC1/AC2 terminals. When using AC input, the onboard B260A Schottky diodes provide full-wave rectification. No external bridge rectifier is required. Input polarity must be observed for DC operation: AC1 = positive, AC2 = negative.

How is LED current adjusted on this evaluation board?

LED current is set by the parallel resistance of R1 and R2 (both 0.2Ω, 1% film), yielding 0.1Ω total sense resistance. Using the formula R_SENSE = 100mV / I_LED, the default configuration delivers 1A. To change current, replace R1/R2 with matched resistors per the same formula.

Can both PWM and analog dimming be used simultaneously on the EN/DIM pin?

No - the EN/DIM pin supports only one dimming mode at a time. PWM dimming requires R5 removed and a 1kΩ resistor placed on R4; analog dimming requires R4 open and R5 shorted. Hardware reconfiguration is mandatory to switch between modes.

What is the role of the NC pins on U1 (MP24895GQ)?

U1 is the MP24895GQ in QFN-6 (3×3mm) package. Pins 3 (NC) and 6 (NC) are no-connect terminals per the official MPS datasheet - they are internally unconnected and must remain unpopulated or floating. Board layout confirms these pads are not routed.

Does the EV24895-Q-00A include EMI filtering components?

No dedicated EMI filter components (e.g., common-mode chokes or Y-capacitors) are included. The board uses ceramic and electrolytic input/output capacitors plus a shielded 47µH inductor (LQH88PN470M38L) to meet basic conducted emission requirements for lab evaluation, but system-level EMI compliance requires additional filtering per end-application standards.

Is thermal performance data provided for continuous 1A operation?

Yes - the board achieves ≤45°C junction rise above ambient at 1A/24V input under free-air convection, measured per MPS Application Note AN105. Thermal relief is enhanced by copper pour on both layers tied to PGND and AGND planes, with U1's exposed pad soldered to internal ground plane.