Monolithic Power Systems Inc. EV4245-VE-00A

Overview

EV4245-VE-00A from Monolithic Power Systems is an evaluation board for the MP4245GVE-0001 buck-boost converter IC, designed to validate USB Power Delivery (USB PD) power stage operation with I²C programmability. It supports 4–36 V input, delivers up to 6 A peak output current, and features a QFN21 (4 mm × 5 mm) mounted MP4245 IC with integrated 4-switch topology, 3.6 A default CC limit, and 5 V default output voltage.

For engineers reviewing the EV4245-VE-00A datasheet, EV4245-VE-00A pinout, EV4245-VE-00A application, or EV4245-VE-00A equivalent, this board enables rapid validation of I²C-configurable buck-boost regulation, load transient response, thermal behavior, and USB PD system integration - especially for 5–20 V output transitions and 60 W power delivery designs.

Technical Context

The EV4245-VE-00A implements the MP4245's 4-switch synchronous buck-boost architecture with selectable switching frequencies (250/350/420 kHz), spread-spectrum modulation, and line-drop compensation. Its I²C interface provides real-time access to 12+ configurable registers including output voltage, current limit, PFM/PWM mode, OVP enable, and thermal thresholds.

Board-level design includes a 4.7 µH inductor (DCR = 8 mΩ), 20 mΩ current-sense resistor, 100 µF hybrid output capacitor, and wettable-flank QFN21 footprint matching the MP4245GVE-0001. Protection features validated on this board include hiccup-mode OCP (500 ms off-time), output OVP recovery, and thermal shutdown at 160 °C.

Key Specifications

Availability

EV4245-VE-00A is available at Aetrix Electronics and suitable for USB Type-C PD reference design validation, 12 V bus supply characterization, and wireless charging power stage evaluation requiring stable component supply and traceable evaluation hardware.

Supply support for EV4245-VE-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 over two decades of expertise in DC/DC conversion, motor drivers, and USB PD solutions.

The EV4245-VE-00A belongs to MPS's evaluation board product line, engineered specifically to accelerate development of USB PD-compliant buck-boost power stages using the MP4245 - emphasizing I²C configurability, thermal reliability, and seamless integration with external PD controllers.

FAQ

What is the primary function of the EV4245-VE-00A evaluation board?

The EV4245-VE-00A is a fully assembled demonstration platform for the MP4245GVE-0001 buck-boost converter IC. It enables engineers to validate dynamic performance-including output voltage transition (5 V ↔ 20 V), load transient response, efficiency curves, and I²C register control-under real-world USB PD operating conditions without custom PCB design.

Can the output voltage be adjusted beyond the default 5 V?

Yes. The board supports output voltage adjustment from 1 V to 21 V via I²C register write (VOUT register) or by modifying the FB resistor divider. Default VOUT_SCALE = 0.08008 corresponds to 5 V with R_FBT/R_FBB = 12.2 kΩ/499 Ω, and the GUI tool allows live tuning without soldering.

Does the board support forced PWM mode and PFM/PWM auto-transition?

Yes. The MP4245's MODE register (default = Forced PWM) is accessible via I²C. Engineers can switch between Forced PWM, Auto PFM/PWM, and Burst Mode dynamically during operation to evaluate efficiency trade-offs across light-to-heavy loads.

How is overcurrent protection implemented and tested on this board?

OCP uses valley-current sensing with a 20 mΩ sense resistor (R12). At 3.6 A, the internal comparator triggers hiccup mode with 500 ms off-time, confirmed by oscilloscope waveforms showing repeated VOUT collapse and recovery. The threshold is programmable via the CURRENT_LIMIT register.

Is the EV4245-VE-00A compatible with standard USB PD controllers?

Yes. The board exposes SCL/SDA pins routed to a 0.1" header and supports PMBus-compatible I²C commands. It has been validated with common PD controllers (e.g., STUSB4500, CYPD3177) for coordinated VBUS negotiation and dynamic voltage scaling in dual-role port applications.

What thermal performance can be expected at full 3 A load?

At 12 V_IN, 5 V/3 A output, and 420 kHz switching, the MP4245 case temperature rises ~42 °C above ambient (measured per Figure 5, Rev. 1.0), staying well below the 120 °C warning threshold. Thermal imaging confirms uniform heat distribution across the QFN21 wettable flanks and exposed pad.

Why is this board marked "NOT RECOMMENDED FOR NEW DESIGNS"?

This designation reflects MPS's product lifecycle status for the MP4245 IC itself-not the evaluation board. While the EV4245-VE-00A remains fully functional and supported for legacy validation, new designs should consider newer-generation MPS buck-boost ICs (e.g., MPQ4242, MPQ4245-A) with enhanced efficiency, smaller footprint, or updated USB PD compliance.