Monolithic Power Systems Inc. EV2345-J-00A

Overview

EV2345-J-00A from Monolithic Power Systems is a fully assembled evaluation board for the MP2345GJ synchronous step-down converter, delivering 5V/2.5A output from 7.5–26V input with 600kHz fixed-frequency operation, internal 90mΩ/40mΩ MOSFETs, and thermal shutdown protection. It supports rapid validation of power supply designs in white goods and flat-panel displays.

For engineers reviewing the EV2345-J-00A datasheet, EV2345-J-00A pinout, EV2345-J-00A application, or EV2345-J-00A equivalent, this board enables immediate functional verification of MP2345-based 5V/2.5A DC-DC conversion under real load, line, and transient conditions without component selection or layout effort.

Technical Context

The EV2345-J-00A implements the MP2345GJ IC in a fixed 5V output configuration using an external 10µH inductor and optimized ceramic capacitor network (22µF ×2 output, 0.1µF bypass, 10pF feedforward). It operates in continuous conduction mode (CCM) at 600kHz with internal soft-start and hiccup-mode over-current protection.

Test data confirms ≤±0.5% load regulation across 0–2.5A and ≤±0.3% line regulation over 7.5–26V input, with peak efficiency of 92% at 12V_IN/5V_OUT/1A. Thermal rise remains below 40°C at full 2.5A load with no forced airflow.

Key Specifications

Availability

EV2345-J-00A is available at Aetrix Electronics and suitable for white goods control modules, flat-panel TV standby supplies, and industrial HMI power rails requiring stable component supply and rapid prototyping capability.

Supply support for EV2345-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 MP2345 product line delivers compact, high-efficiency synchronous buck converters for space-constrained 5V/3.3V point-of-load applications in consumer and industrial equipment, emphasizing minimal external components and robust thermal performance.

FAQ

What input voltage range is supported by the EV2345-J-00A?

The board accepts 7.5V to 26V DC input, verified per test data across all operating conditions. Operation below 7.5V may cause dropout or startup failure; above 26V risks overstressing the MP2345GJ's internal MOSFETs and violates absolute maximum ratings.

Can the output voltage be adjusted to 3.3V?

Yes - the MP2345GJ supports adjustable output via external resistive divider on FB pin. The EV2345-J-00A uses R1=80.6kΩ and R2=15kΩ for 5V, but replacing R1 with 40.2kΩ achieves 3.3V while maintaining proper feedback current and stability.

Does the board include thermal management features?

Yes - the PCB uses 2oz copper on both layers with thermal vias under the MP2345GJ TSOT23-6 package. Test results show ≤40°C case temperature rise at 2.5A/26V_IN, and the IC activates thermal shutdown only above 150°C junction temperature.

What is the purpose of the optional D1/D2 diodes on the schematic?

D1 and D2 are 1N4148 signal diodes placed across the SW node and BST capacitor for ringing suppression. They are not populated by default but may be added to reduce switching node overshoot in high-noise environments or when using non-ideal layout practices.

Is the EV2345-J-00A RoHS and halogen-free compliant?

Yes - all components on the board meet RoHS Directive 2011/65/EU and are halogen-free per IEC 61249-2-21. MPS certifies the MP2345GJ IC as lead-free, and Murata/Yageo/Wurth BOM parts carry corresponding green status documentation.

How is enable functionality implemented?

The board routes the MP2345GJ's EN pin to a test point (TP1) with pull-up to VCC. Applying <0.4V to TP1 disables the converter; >1.25V enables it. No external pull-up resistor is required - internal 1.5MΩ pull-up ensures default-on behavior when unconnected.