Monolithic Power Systems Inc. EVQ4485-U-00A

Overview

EVQ4485-U-00A from Monolithic Power Systems is an AEC-Q100 qualified evaluation board for the MPQ4485 dual-port USB charging power converter IC. It integrates a 6V–36V input synchronous buck regulator with two independently controlled USB power switches, supporting USB Type-C 5V@3A DFP mode on USB1 and BC1.2 CDP mode on USB2 for automotive infotainment and center console power delivery.

For engineers reviewing the EVQ4485-U-00A datasheet, EVQ4485-U-00A pinout, EVQ4485-U-00A application, or EVQ4485-U-00A equivalent, this board enables rapid validation of USB charging port behavior, load shedding response, line-drop compensation accuracy, and thermal performance under real-world automotive input conditions (6V–36V) and simultaneous 3A/2.5A output loads.

Technical Context

The EVQ4485-U-00A implements the MPQ4485GU QFN26 (5mm×5mm) IC in a four-layer, 2oz copper PCB layout optimized for thermal dissipation and EMI control. It supports default configuration with USB1 set to Type-C 5V@3A DFP mode and USB2 configured for CDP mode, enabling automatic device detection without external firmware.

Board-level features include discrete 4.7μH and 2.2μH shielded inductors (Wurth 7443551470 and 74438356022), polymer and ceramic output capacitors, and Wurth TYPE-C (632723300011) and TYPE-A (61400416021) USB connectors. Load shedding and over-current protection are hardware-configured per MPQ4485GU-LS-AEC1 functionality.

Key Specifications

Availability

EVQ4485-U-00A is available at Aetrix Electronics and suitable for automotive infotainment head units, center console USB hubs, and vehicle telematics modules requiring stable component supply and AEC-Q100-aligned reference validation.

Supply support for EVQ4485-U-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 design centers across Asia and North America and global manufacturing partnerships.

The MPQ4485 product line targets automotive-grade USB power delivery, integrating buck conversion, USB port identification, and fault protection into a single AEC-Q100 qualified IC for next-generation in-vehicle charging systems.

FAQ

What is the primary function of the EVQ4485-U-00A board?

The EVQ4485-U-00A is an evaluation board for the MPQ4485 IC, designed to validate dual-port USB charging performance in automotive environments. It demonstrates full implementation of USB Type-C 5V@3A DFP mode on USB1 and BC1.2 CDP mode on USB2, including line-drop compensation, hiccup current limiting, and thermal shutdown behavior under real input voltage transients.

Does the board support simultaneous use of Type-A and Type-C ports?

No. The hardware design explicitly prohibits concurrent operation: the Type-A and Type-C ports cannot be used at the same time. This restriction is enforced by shared signal routing and configuration jumpers (JP1), as documented in the Quick Start Guide step 8.

How is USB port mode selection implemented on this board?

Mode selection is fixed by hardware configuration: USB1 defaults to Type-C 5V@3A DFP mode using internal CC logic emulation, while USB2 defaults to CDP mode via resistor-based ID pin biasing. No firmware or external controller is required-mode detection is fully autonomous per BC1.2 and USB Type-C specifications.

What input voltage range does the board support during functional testing?

The board supports 6V to 36V DC input, covering full automotive battery operating range including cold-crank (6V), nominal (12V–14V), and load-dump (up to 36V) conditions. Efficiency curves and thermal images in the documentation are validated across this entire range.

Is load shedding functionality active on this evaluation board?

Yes-load shedding entry and recovery behavior is implemented and testable on boards populated with the MPQ4485GU-LS-AEC1 variant. The board captures transient response during USB1 load reduction (e.g., 0.5A → 0A), showing VOUT stability and VCC1 regulation during shedding events.

Can the board be used to verify USB data transmission capability?

Yes-with hardware modifications: for Type-C data testing, connect a mobile device to the TYPE-C receptacle and attach the USB_Plug to a host controller; for Type-A data, remove capacitor C7 and replace R3 with 80.6kΩ while leaving R4 floating, per the Quick Start Guide steps 6 and 7.