Monolithic Power Systems Inc. EV5402-R-00A

Overview

EV5402-R-00A from Monolithic Power Systems is an evaluation board for the MP5402 monolithic step-down converter with dual USB charging ports, supporting 7–36V input, 5V/2.4A per port output, BC1.2 DCP identification, and selectable 150/250/350 kHz switching frequency in automotive cigarette lighter and linear charger power supply applications.

For engineers reviewing the EV5402-R-00A datasheet, EV5402-R-00A pinout, EV5402-R-00A application, or EV5402-R-00A equivalent, this board enables rapid validation of USB charging port behavior, line-drop compensation tuning, frequency selection effects on EMI, and BC1.2 mode detection under real load conditions.

Technical Context

The EV5402-R-00A implements a four-layer PCB layout optimized for thermal dissipation and noise control, integrating the MP5402 QFN26 (4mm×4mm) IC with 22μH toroidal inductor (L1), 100μF aluminum electrolytic input capacitor (C1), and dual 270μF polymer output capacitors (C2/C2A) to sustain 5A total continuous output current with <±1% load regulation across 0–2.4A per USB port.

It supports three fixed switching frequencies (150/250/350 kHz) via resistor configuration, delivers programmable line-drop compensation to maintain 5V ±50mV at USB connectors under 100mΩ cable resistance, and executes automatic BC1.2 DCP detection without host MCU intervention using internal voltage-divider and 1.2V/1.2V sensing circuits.

Key Specifications

Availability

EV5402-R-00A is available at Aetrix Electronics and suitable for USB charging adapter development, automotive accessory power design, and linear charger supply validation requiring stable component supply, repeatable test platform performance, and documented reference schematics.

Supply support for EV5402-R-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 over two decades of innovation in DC/DC conversion, motor drivers, and USB power delivery solutions.

The EV5402-R-00A belongs to MPS' evaluation board product line, designed specifically to accelerate adoption of their integrated USB charging converters by providing validated layouts, tested BOMs, and application-ready firmware-free operation.

FAQ

What is the primary function of the EV5402-R-00A evaluation board?

The EV5402-R-00A is a functional demonstration platform for the MP5402 IC, enabling engineers to validate dual-port USB charging performance-including BC1.2 DCP detection, current limiting accuracy, line-drop compensation behavior, and frequency-selectable efficiency-without designing custom hardware. It is not a production-ready module but a debug and characterization tool.

Does the board support simultaneous full-current operation on both USB ports?

Yes. The board sustains 2.4A continuously on each USB port (4.8A total) when input voltage is ≥12V and ambient temperature is ≤25°C, as verified in MPS test reports. Thermal derating begins above 40°C ambient due to PCB copper area limitations, not IC capability.

How is switching frequency selected on this evaluation board?

Frequency is set by populating one of three resistor positions (R6, R7, or R8) on the board: open circuit = 150 kHz, 0Ω = 250 kHz, and 10kΩ = 350 kHz. Default configuration uses R6 open, yielding 150 kHz operation unless modified per the Quick Start Guide.

Can the EN pin be used to control both USB ports simultaneously?

Yes. Driving the EN pin >2V enables the entire MP5402 IC, powering both USB ports and the buck regulator. Driving EN <1V disables all outputs, including USB VBUS and internal LDOs. No separate port enable/disable is supported-the IC operates as a single system.

Is line-drop compensation adjustable on this board?

Yes. Line-drop compensation is programmed via resistor divider network R1 and optional series resistor at the FB node. The default R1 (300kΩ) sets nominal compensation; changing R1 alters the voltage offset added to feedback to counteract cable IR drop, with values documented in MP5402 datasheet Section 8.2.2.

What USB identification modes are verified on this board?

All three BC1.2-compliant modes are factory-verified: Dedicated Charging Port (DCP) using shorted D+/D−, Divider Mode using 200kΩ/200kΩ resistive divider, and 1.2V/1.2V Mode using matched 1.2V references on both data lines. Detection occurs within 500ms and requires no host interaction.