Monolithic Power Systems Inc. EV2238-D-00A

Overview

EV2238-D-00A from Monolithic Power Systems is an evaluation board for the MP2238GD synchronous step-down converter, delivering 8A continuous output at 1V from a 4.2–18V input. It implements constant-on-time control, integrates 22mΩ/10mΩ MOSFETs, and features over-current protection, thermal shutdown, and internal soft-start in a compact 63.5mm × 63.5mm layout.

For engineers reviewing the EV2238-D-00A datasheet, EV2238-D-00A pinout, EV2238-D-00A application, or EV2238-D-00A equivalent, this board enables rapid validation of high-current, low-voltage DC/DC conversion in space-constrained consumer power systems with fast transient response and stable regulation under dynamic load conditions.

Technical Context

The EV2238-D-00A implements the MP2238GD IC in a fully assembled, tested configuration optimized for 1V/8A operation using a 0.68µH inductor (Wurth 744311068) and low-ESR ceramic output capacitors. Input filtering uses 22µF X5R/X7R ceramics, and feedback is set via precision resistors (R1 = 40.2kΩ, R2 = 60.4kΩ) to achieve 600mV reference-based regulation.

Constant-on-time (COT) control ensures sub-microsecond load-step response without external compensation. Protection logic includes hiccup-mode SCP triggered by current-sense resistors (R5/R6 = 10mΩ), thermal foldback activation above 150°C, and enable threshold of 1.3V (ON) / 0.9V (OFF), verified across 5V/12V/18V input conditions.

Key Specifications

Availability

EV2238-D-00A is available at Aetrix Electronics and suitable for digital TV power supply design, flat-panel monitor development, and distributed power system prototyping requiring stable component supply, repeatable lab validation, and production-ready reference schematics.

Supply support for EV2238-D-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, LED drivers, and motor control solutions.

The MP2238 product line targets high-current, low-voltage point-of-load applications in consumer electronics, where compact size, fast transient response, and robust protection are critical design requirements.

FAQ

What input voltage range is validated on the EV2238-D-00A board?

The board is fully characterized across 5V, 12V, and 18V input conditions per official test reports. Efficiency curves, startup/shutdown waveforms, and transient response data confirm stable operation from 4.2V to 18V - matching the MP2238GD's rated input range. No external component changes are needed within this span.

Can the output voltage be adjusted to values other than 1V?

Yes - the feedback network (R1 = 40.2kΩ, R2 = 60.4kΩ) sets VOUT = 1V based on the 600mV internal reference. Replacing R1/R2 with values satisfying VOUT = 0.6V × (1 + R1/R2) allows precise adjustment. The board layout includes solder pads supporting alternative resistor configurations without PCB modification.

Does the board include thermal monitoring or reporting circuitry?

No - the EV2238-D-00A relies on the MP2238GD's internal thermal shutdown (triggering at ~150°C junction temperature), but does not integrate external temperature sensors, ADC interfaces, or thermal telemetry outputs. Thermal performance is verified via infrared imaging and load-step derating tests documented in the Rev. 1.0 report.

What is the purpose of the two 10mΩ current-sense resistors (R5 and R6)?

R5 and R6 serve as parallel current-sense elements for over-current protection, providing redundancy and lower effective resistance (5mΩ total) to minimize power loss while maintaining accurate sensing. They feed directly into the MP2238GD's current-limit comparator, enabling hiccup-mode recovery during sustained overload or short-circuit events.

Is the board RoHS-compliant and lead-free?

Yes - all components on the EV2238-D-00A, including the MP2238GD IC, Murata capacitors, YAGEO resistors, and Wurth inductor, are lead-free, halogen-free, and compliant with the EU RoHS directive. MPS confirms green status for this part family on its Quality Assurance portal.

How is the enable function implemented and tested?

The EN pin accepts a 0–5V logic signal with thresholds of 1.3V (turn-on) and 0.9V (turn-off). Startup/shutdown waveforms in the datasheet show clean, jitter-free transitions at both 0A and 8A loads, confirming reliable digital control without latch-up or false triggering under dynamic conditions.