Monolithic Power Systems Inc. EVKT-8864

Overview

EVKT-8864 from Monolithic Power Systems is an evaluation kit for the MP8864GQ synchronous step-down converter, enabling rapid validation of I²C-programmable 4 A, 4.5–21 V input, 0.6–1.87 V output DC/DC regulation in SoC and media processor power rails. It includes the EV8864-Q-00A evaluation board, EVKT-USBI2C-02 USB-to-I²C dongle, and Tdrive-8864 flash drive with GUI software and documentation.

For engineers reviewing the EVKT-8864 datasheet, EVKT-8864 setup guide, EVKT-8864 GUI operation, or EVKT-8864 alternative evaluation platforms, this kit delivers full I²C register access, real-time voltage/frequency/slew-rate adjustment, power-good monitoring, and thermal/current fault visualization - all on a production-representative QFN-15 layout with validated BOM and PCB routing.

Technical Context

The EVKT-8864 implements the MP8864's dual-control architecture: FB resistor-based startup (default 0.9 V) followed by seamless transition to I²C-controlled VREF scaling (0.6–1.87 V in 10 mV steps) with programmable slew rate. It supports three operating modes - AAM (light-load efficiency), DCM, and CCM - selectable via I²C MODE bit.

Hardware interfaces include dedicated SDA/SCL lines routed to the USB-I²C dongle, EN/SYNC pin accessible for external enable or clock synchronization (300 kHz–2 MHz), ADD pin for dual I²C address selection, and PG open-drain output with 80 µs deglitching. The board integrates all critical passive components: 1 µH shielded inductor, 47 µF output capacitor, 0.22 µF VCC decoupling, and 22 nF BST capacitor.

Key Specifications

Availability

EVKT-8864 is available at Aetrix Electronics and suitable for SoC power validation, media processor reference design bring-up, and distributed power system prototyping requiring stable component supply, full I²C configurability, and production-grade thermal performance.

Supply support for EVKT-8864 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 MP8864 product line targets high-density, dynamically reconfigurable power rails for application processors and AI accelerators - emphasizing I²C-based voltage agility, fast transient response, and minimal external component count in compact QFN packages.

FAQ

Does EVKT-8864 support both FB resistor-based and I²C-based output voltage control?

Yes. At power-on, the board defaults to FB-based regulation (e.g., 0.9 V if FB tied to VCC). Once the GUI establishes I²C communication, it switches to VREF-controlled mode with full 0.6–1.87 V range, 10 mV resolution, and programmable slew rate - verified via real-time VOUT oscilloscope capture and register readback.

What is the maximum input voltage the EVKT-8864 board can safely handle?

The board supports up to 21 V DC input, matching the MP8864GQ's absolute maximum VIN rating. Input capacitors are rated for 25 V, and the PCB layout includes 15-mil VIN traces with thermal relief to PGND. Operation above 21 V risks permanent damage to the IC and violates the device's ABS MAX specification.

Can the EVKT-8864 be synchronized to an external clock source?

Yes. The EN/SYNC pin accepts external clock signals from 300 kHz to 2 MHz. When enabled via I²C register, the internal oscillator locks to the external clock's rising edge. The board provides direct access to EN/SYNC through a test point and 0.1" header, allowing clean signal injection without soldering.

Is the USB-to-I²C dongle included with EVKT-8864 compatible with Linux or macOS?

No. The EVKT-USBI2C-02 dongle requires Windows 7/10/11 and the proprietary MPS GUI software. Driver installation and firmware updates are only provided for Windows. Linux/macOS users must rely on third-party I²C adapters and custom Python scripts using the documented register map.

How does the EVKT-8864 demonstrate over-current protection behavior?

The board triggers hiccup-mode OCP when load current exceeds ~7.5 A (typical ILIMIT). During fault, PG pulls low after 80 µs, VOUT collapses, and the GUI logs "OCP Active" with register bit status. Recovery occurs automatically once short is removed - confirmed by observing 1-second restart cycles on oscilloscope and GUI event timeline.

Does the evaluation kit include thermal imaging or temperature sensor data?

No. The EVKT-8864 has no onboard temperature sensors. Thermal performance is assessed indirectly via ambient derating curves in the MP8864 datasheet and IR camera measurements on the QFN-15 exposed pad. The GUI displays junction temperature estimates derived from die thermal resistance (θJC = 12°C/W) and measured case temperature.