Monolithic Power Systems Inc. EV8003A-Q-00A

Overview

EV8003A-Q-00A from Monolithic Power Systems is an IEEE 802.3af/at-compliant evaluation board for the MP8003A powered device (PD) interface controller. It demonstrates full PoE PD functionality including 2-event classification, 120mA inrush current limit, 840mA operational current limit, auxiliary adaptor ORing, and thermal protection - validated at 48V input with 600mA load on a QFN-10 (3mm×3mm) IC.

For engineers reviewing the EV8003A-Q-00A datasheet, EV8003A-Q-00A pinout, EV8003A-Q-00A application, or EV8003A-Q-00A equivalent, this board enables rapid validation of PoE PD startup sequencing, power-good signaling, Type 2 PSE detection (T2P), and seamless switchover between PSE and 12V wall adapter supply under real-world load conditions.

Technical Context

The EV8003A-Q-00A implements a complete IEEE 802.3af/at PD interface using the MP8003AGQ controller, supporting both single-signature (Type 1) and dual-signature (Type 2) classification. It integrates a 100V/0.48Ω pass switch, internal current sensing, and open-drain T2P indicator for PSE handshake confirmation.

Board-level design includes EMI-filtered RJ45 jacks (J1/J2), a 749020010A LAN transformer, SMAJ58A TVS for surge protection, STPS2H100AY Schottky rectifier, and BSS63LT1G PNP transistor for AUX-controlled power path selection - all configured to meet Class 4 (30W) PD requirements per 802.3at.

Key Specifications

Availability

EV8003A-Q-00A is available at Aetrix Electronics and suitable for PoE-powered security cameras, VoIP phones, and WLAN access points requiring stable component supply, fast prototyping cycles, and compliance-ready reference validation.

Supply support for EV8003A-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 core expertise in DC/DC conversion, LED drivers, and power-over-Ethernet solutions.

The EV8003A-Q-00A belongs to MPS's PoE evaluation platform family, designed specifically to accelerate development of IEEE 802.3af/at-compliant powered devices by providing verified signal integrity, thermal layout, and interoperability-tested hardware.

FAQ

What is the primary function of the EV8003A-Q-00A evaluation board?

The EV8003A-Q-00A is a fully assembled demonstration platform for the MP8003A PoE PD interface controller. It validates IEEE 802.3af/at compliance, including classification, inrush control, power-good signaling, Type 2 PSE detection (T2P), and auxiliary power switchover - without requiring additional components or PCB layout effort.

Does the board support both 802.3af and 802.3at standards?

Yes. The board implements dual-signature classification using RDET = 24.9 kΩ and RCLASS = 28.7 Ω, enabling full interoperability with both 802.3af (Type 1) and 802.3at (Type 2) power sourcing equipment, as confirmed in the Rev. 1.0 test report under 48 V / 600 mA load conditions.

How does the auxiliary power switchover work on this board?

The board uses the MP8003A's AUX pin to drive a BSS63LT1G PNP transistor, enabling automatic prioritization of 12 V wall adapter input over PSE supply. When adapter voltage is applied to VDD/ADP-GND, the AUX signal pulls the base low to enable conduction - verified in Quick Start Guide Method 7.

What protection features are implemented on the EV8003A-Q-00A?

The board integrates SMAJ58A TVS diodes (58 V clamping), thermal shutdown via MP8003A's internal circuitry, 120 mA inrush limiting, and 840 mA overcurrent protection. These match the MP8003A's datasheet specifications and were validated in overload and surge test conditions per the Rev. 1.0 report.

Can the EV8003A-Q-00A be used to evaluate other MPS PD controllers?

No. The board is specifically designed for the MP8003AGQ in QFN-10 (3mm×3mm) packaging. Pinout, component values (e.g., RDET, RCLASS), and layout are optimized for that IC only. It is not compatible with MP8002A, MP8004A, or other members of the MP800x family due to differences in classification logic and AUX behavior.

Is the RJ45 connector on the board EMI-filtered?

Yes. J1 and J2 are RJ45-8N4-B connectors with integrated EMI/RFI filters and common-mode chokes, as specified in the Bill of Materials. This supports clean signal integrity and meets EN 55022 Class B emissions requirements when used with the 749020010A LAN transformer.

What is the maximum continuous output current demonstrated on this board?

The board was tested and validated at 600 mA output current (IOUT) with 48 V input and 25°C ambient temperature, as documented in the EVB Test Results section (Page 4). This aligns with the MP8003A's 840 mA operational current limit and supports Class 4 (30 W) PD applications.