Monolithic Power Systems Inc. EV9989-V-00A

Overview

EV9989-V-00A from Monolithic Power Systems is an evaluation board for the MP9989GV synchronous rectifier IC, designed to replace diode rectifiers in flyback converters. It integrates a 100V/10mΩ MOSFET, regulates forward voltage drop to 40mV, supports DCM/CCM/QR operation, and eliminates need for auxiliary winding - enabling high-efficiency USB PD and laptop adapter designs.

For engineers reviewing the EV9989-V-00A datasheet, EV9989-V-00A pinout, EV9989-V-00A application, or EV9989-V-00A equivalent, this board provides validated reference design, quick-start integration guidance, and real-world performance validation of MP9989's fast turn-off, ringing detection, and zero-voltage startup capabilities in high-side and low-side synchronous rectification topologies.

Technical Context

The EV9989-V-00A implements the MP9989GV IC in a functional flyback synchronous rectification test platform. Its circuit topology enables direct replacement of freewheel diodes with precise 40mV forward-voltage regulation and sub-100ns turn-off timing to prevent reverse conduction during V_DS reversal.

Board-level features include on-board 470nF/25V and 2.2nF/250V ceramic capacitors, precision 20Ω and 100Ω film resistors, and 1.0mm pitch VS/VD/VDD connectors - all optimized for stable operation across 0V–20V output ranges without auxiliary winding dependency.

Key Specifications

Availability

EV9989-V-00A is available at Aetrix Electronics and suitable for USB PD charger development, laptop adapter qualification, and high-efficiency flyback converter prototyping requiring stable component supply and rapid design validation.

Supply support for EV9989-V-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 focus on efficiency, integration, and thermal robustness.

The MP9989 product line targets high-density AC/DC adapters and USB-C power delivery systems, delivering intelligent synchronous rectification with self-powered operation and ringing immunity for next-generation chargers.

FAQ

What is the primary function of the EV9989-V-00A evaluation board?

The EV9989-V-00A is a functional demonstration platform for the MP9989GV synchronous rectifier IC. It enables engineers to validate fast turn-off behavior, 40mV forward-voltage regulation, and auxiliary-winding-free operation in real flyback circuits - directly replacing freewheel diodes without redesigning transformer auxiliary windings.

How does the board connect to a flyback converter?

The board connects via three 1.0mm-pitch terminals labeled VS (source), VD (drain), and VDD (supply). VS and VD are wired in series with the secondary-side rectification path, replacing the freewheel diode; VDD draws power from the rectified output, eliminating need for auxiliary winding.

Does EV9989-V-00A support both high-side and low-side synchronous rectification?

Yes - the MP9989GV IC on this board supports both configurations. Its self-powered architecture and internal ringing detection allow reliable operation in either placement, verified across DCM, CCM, and QR modes without external bias circuitry.

What output voltage range is validated on this board?

The board is characterized for 0V–20V output operation, including true zero-volt startup capability. This makes it suitable for USB PD 3.0/3.1 fixed and programmable power supply (PPS) applications where low-output-voltage regulation is critical.

Are the BOM components lead-free and RoHS-compliant?

Yes - all listed components, including Murata GRM21BR71E474KA01L, TDK C2012X7R2E222K, and Yageo RC-series resistors, are lead-free, halogen-free, and RoHS-compliant per MPS green policy and EU Directive 2011/65/EU.

Can this board be used for Energy Star compliance testing?

Yes - the MP9989GV IC and its implementation on EV9989-V-00A are explicitly stated as Energy Star compatible in the official documentation, supporting efficiency validation for Level VI and DoE Tier 2 requirements in AC/DC adapter designs.