Monolithic Power Systems Inc. EV2451-J-00A

Overview

EV2451-J-00A from Monolithic Power Systems is an evaluation board for the MP/MPQ2451DJ step-down DC/DC converter IC, supporting 8–36V input, fixed 5V/0.6A output, and 2MHz switching frequency. It integrates a 500mΩ internal high-side MOSFET, uses ceramic output capacitors, and features internal soft-start and thermal shutdown for automotive and industrial power conversion validation.

For engineers reviewing the EV2451-J-00A datasheet, EV2451-J-00A pinout, EV2451-J-00A application, or EV2451-J-00A equivalent, this board enables rapid functional verification of the MP/MPQ2451DJ's efficiency, transient response, enable control, and adjustable output voltage (0.8V–0.9·VIN) under real load conditions with minimal external components.

Technical Context

The EV2451-J-00A implements current-mode control architecture using the MP/MPQ2451DJ IC to deliver fast loop response and stable regulation across 0–0.6A loads. Its 2MHz fixed-frequency operation allows compact passive selection: 3.3µH inductor (D62CB-#A920CY-3R3M), 4.7µF/10µF X7R ceramic input/output capacitors, and 23.7kΩ/124kΩ feedback resistors for 5V output.

Board-level design supports EN pin logic control (1.5V turn-on threshold), SCP protection triggered by overcurrent, and thermal shutdown. Input damping capacitance is recommended for ≥24V sources with >0.5m cable lengths to suppress ringing and ensure startup reliability.

Key Specifications

Availability

EV2451-J-00A is available at Aetrix Electronics and suitable for automotive infotainment power validation, industrial sensor node development, and battery-powered IoT gateway prototyping requiring stable component supply and fast time-to-test.

Supply support for EV2451-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 power management ICs, with expertise in DC/DC converters, LED drivers, and motor drivers for automotive, industrial, and consumer applications.

The MP/MPQ2451 product line delivers high-voltage, high-efficiency buck regulators targeting space-constrained, thermally sensitive applications such as ADAS cameras, telematics units, and programmable logic controllers.

FAQ

What input voltage range is supported on the EV2451-J-00A?

The board operates with 8–36 V DC input, verified per MPS datasheet and test reports. For inputs ≥24 V, a damping capacitor must be added at VIN/GND terminals when cable length exceeds 0.5 m to prevent oscillation during startup and load transients.

How do I adjust the output voltage from 5V to 3.3V?

Replace R1 with 40.2 kΩ (1%) and retain R2 at 124 kΩ (1%). The feedback network sets VOUT = 0.8 V × (1 + R1/R2). This configuration is listed in the Quick Start Guide and validated in the Bill of Materials for 3.3 V output.

Does the board support enable/disable control?

Yes - the EN pin accepts TTL-compatible logic: drive above 1.5 V to enable regulation, below 1.1 V to disable. Floating EN defaults to off. Test waveforms in the schematic document confirm clean startup/shutdown timing with 2 V/div EN signal edge control.

What is the maximum achievable efficiency and at what condition?

Peak efficiency exceeds 90% at 0.3 A output current with 12 V input, per published test data (Figure 1, Rev. 1.0). Efficiency drops to ~85% at 0.6 A and ~75% at 0.1 A due to fixed gate-drive and conduction losses dominating at light/heavy loads.

Can I use this board for AEC-Q100 Grade 1 qualification testing?

Yes - the underlying MPQ2451DJ IC is AEC-Q100 Grade 1 qualified. The EV2451-J-00A board uses only automotive-grade passives (e.g., Murata GRM series capacitors, Yageo film resistors) and follows layout practices aligned with automotive EMC requirements per MPS application guidance.

Is thermal shutdown active during overload testing?

Yes - thermal shutdown is implemented in the MP/MPQ2451DJ IC and verified in test results. During sustained short-circuit events, the IC cycles off until die temperature falls, then recovers automatically, as shown in the "Short Circuit Recovery" oscilloscope capture on page 6 of the reference document.