Monolithic Power Systems Inc. EV2459-J-00A

Overview

EV2459-J-00A from Monolithic Power Systems is an evaluation board for the MP2459 synchronous step-down DC-DC converter IC, supporting 7–50V input, delivering regulated 5V/0.5A output at fixed 480kHz switching frequency, with up to 90% efficiency and integrated high-side 55V MOSFET. It targets high-voltage industrial and automotive power conversion prototyping.

For engineers reviewing the EV2459-J-00A datasheet, EV2459-J-00A pinout, EV2459-J-00A application, or EV2459-J-00A equivalent, this board enables rapid validation of MP2459-based 5V supply designs under real load conditions (0–0.5A), thermal stress, and transient response across 7–50V input range.

Technical Context

The EV2459-J-00A implements a complete reference design for the MP2459 buck controller, featuring two ceramic input capacitors (2.2μF ×2), one 0.1μF bypass cap, dual output capacitors (4.7μF ×2), and two shielded power inductors (10μH and 15μH) optimized for light-load frequency scaling and EMI suppression. Test points provide direct access to VIN, VOUT, EN, and GND.

It operates with fixed 480kHz switching frequency but leverages MPS's proprietary light-load mode to reduce switching losses below 100mA, maintaining >85% efficiency down to 10mA load. Output voltage is preset to 5V via R1=23.7kΩ and R2=124kΩ feedback divider, referencing the MP2459's 0.812V internal VFB.

Key Specifications

Availability

EV2459-J-00A is available at Aetrix Electronics and suitable for smart power meter development, automotive body electronics qualification, and industrial distributed power system prototyping requiring stable component supply and fast-turn evaluation capability.

Supply support for EV2459-J-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, motor drivers, and LED lighting controllers.

The MP2459 product line delivers high-voltage, high-efficiency buck regulators for cost-sensitive industrial and automotive applications where input ranges exceed 40V and board space is constrained.

FAQ

What is the purpose of the second inductor (L1 = 10μH) on the EV2459-J-00A board?

L1 (10μH) is provided as an alternative output filter inductor for evaluating trade-offs between ripple current, transient response, and efficiency at lighter loads. L2 (15μH) is the default component used in all published test data and efficiency curves per Rev. 1.2 documentation.

Can the output voltage be adjusted, and what is required to change it?

Yes - output voltage is set by the R1/R2 feedback divider. To reprogram VOUT, replace R1 (23.7kΩ) and/or R2 (124kΩ) using the formula R1 = R2 × (VOUT/0.812 − 1). Compensation network components must also be recalculated per MP2459 datasheet Section 8.2.2.

Does the EV2459-J-00A include enable control, and how is it accessed?

Yes - the EN pin of the MP2459 is routed to a 3×2.54mm test point (labeled "EN, GND"). Applying ≥1.2V to this pin enables regulation; pulling ≤0.4V disables output. No pull-up/pull-down is installed - external logic or switch control is required.

What thermal performance can be expected during continuous 0.5A operation?

At 12V_IN/5V_OUT/0.5A/25°C ambient, board surface temperature rise is ≤18°C above ambient per Rev. 1.2 thermal imaging. Derating to 0.4A is recommended above 60°C ambient to maintain reliability and avoid thermal shutdown.

Are input and output capacitors rated for high-reliability operation?

Yes - all ceramics are X7R/X5R dielectrics from Murata with 10% tolerance, rated for 50V (input) and 6.3V (output), and qualified for industrial temperature range (−40°C to +125°C) per manufacturer datasheets.

Is the EV2459-J-00A RoHS-compliant and lead-free?

Yes - all components including the MP2459 IC, passive parts, and PCB meet RoHS Directive 2011/65/EU and are halogen-free. MPS confirms full green status per its Quality Assurance portal and material declarations.