Monolithic Power Systems Inc. EV8864-Q-00A

Overview

EV8864-Q-00A from Monolithic Power Systems is an evaluation board for the MP8864GQ synchronous step-down converter, designed to demonstrate 4A load capability, I²C-programmable output (0.6V–1.87V in 10mV steps), 4.5V–21V input range, and 600kHz default switching frequency in a QFN3×3 package. It supports real-time voltage slew control, power-good indication, and full protection including OCP, OVP, and OTP.

For engineers reviewing the EV8864-Q-00A datasheet, EV8864-Q-00A pinout, EV8864-Q-00A application, or EV8864-Q-00A equivalent, this board enables rapid validation of MP8864GQ's I²C-configurable regulation, transient response under 12V input/1.2V@4A output, thermal performance, and integration into flat-panel TV, set-top box, and distributed power supply designs.

Technical Context

The EV8864-Q-00A implements the MP8864GQ IC in a fully assembled, tested layout with 1µH shielded inductor (Wurth 744311100), low-ESR ceramic output capacitors (22µF ×4), and precision feedback resistors (34kΩ/33kΩ) setting nominal 1.2V output. Input filtering includes 0.22µF BST capacitor and 22µF/1206 VIN bulk capacitance.

It exposes all critical control signals - EN/SYNC, SDA, SCL, PG, SS, and ADD - with 0603 pull-up/pull-down resistors (100kΩ on SDA/SCL, 10Ω current-sense shunts), enabling direct connection to I²C host controllers and external soft-start sequencing without modification.

Key Specifications

Availability

EV8864-Q-00A is available at Aetrix Electronics and suitable for flat-panel television power design, digital set-top box DC-DC validation, and distributed power system prototyping requiring stable component supply, pre-characterized thermal performance, and I²C-controlled voltage ramping.

Supply support for EV8864-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, motor drivers, and LED lighting controllers.

The EV8864-Q-00A belongs to MPS's evaluation board product line, engineered specifically to accelerate adoption of their I²C-programmable buck converters in consumer and industrial power applications demanding flexible, digitally controlled regulation.

FAQ

What is the primary function of the EV8864-Q-00A?

The EV8864-Q-00A is a fully assembled evaluation board for the MP8864GQ synchronous buck converter. Its purpose is to demonstrate real-world performance-including 4A continuous output, I²C voltage programming, thermal behavior, and protection response-under standardized test conditions (VIN=12V, VOUT=1.2V, TA=25°C).

Does the board support adjustable output voltage without firmware changes?

Yes. The EV8864-Q-00A supports on-the-fly output voltage adjustment from 0.6V to 1.87V in 10mV increments using the MP8864 GUI software over its 3.4Mbps I²C interface. No code compilation or hardware modification is required-only connection to an I²C host and execution of the GUI tool.

What are the key layout features that aid thermal testing?

The board uses a 4-layer PCB with dedicated inner ground and power planes, exposed thermal pad soldered to U1's QFN3×3 package, and a 19A-rated 1µH shielded inductor (Wurth 744311100) with 4.6mΩ DCR. These features enable accurate junction-to-ambient thermal resistance measurement and sustained 4A operation without forced airflow.

Can the EN/SYNC pin be used for external synchronization?

Yes. The EN/SYNC pin accepts both enable/disable logic (≥1.4V = on, ≤1.25V = off) and external clock injection for frequency synchronization. When driven with a clean square wave matching the selected switching frequency, it overrides the internal oscillator and locks phase alignment across multiple converters.

Is the Bill of Materials (BOM) provided for production replication?

Yes. The official BOM lists all 18 components with manufacturer part numbers (e.g., Murata GRM31CR61E226KE15L, Yageo 9C06031A3402FKHFT, Wurth 744311100), package codes, and placement notes-including NS (Not Stuffed) items like C12 and R6-enabling direct copy-for-production or design adaptation.

How is over-current protection implemented and verified?

OCP is implemented via internal current-sense circuitry with hiccup-mode recovery. It was verified using a 10Ω sense resistor (R5/R8) and load-step testing: at 4.5A load, the converter cycles off for ~10ms then retries, maintaining safe junction temperature and preventing latch-up during sustained overload.