Monolithic Power Systems Inc. EV2233-J-00A

Overview

EV2233-J-00A from Monolithic Power Systems is an evaluation board designed to demonstrate the MP2233 synchronous step-down converter IC, delivering 3A continuous output at 3.3V from a 5–16V input, operating at 1.4MHz with internal 80mΩ/30mΩ MOSFETs in TSOT23-8 package.

For engineers reviewing the EV2233-J-00A datasheet, EV2233-J-00A pinout, EV2233-J-00A application, or EV2233-J-00A equivalent, this board enables rapid validation of high-efficiency DC/DC conversion for compact I/O power rails, load transient response, and thermal performance under real-world conditions.

Technical Context

The EV2233-J-00A implements the MP2233 - a current-mode, synchronous buck regulator featuring integrated high-side and low-side MOSFETs, programmable soft-start via external capacitor, and hiccup-mode overcurrent protection. It supports EN/SYNC control and operates across 5–16V input with fixed 3.3V output on this board.

Board-level design includes a 1.5μH shielded inductor (Wurth 744311150), input/output ceramic capacitors (22μF X5R/X7R), feedback resistors (R1=40.2kΩ, R2=13kΩ) setting VOUT=3.3V, and BST capacitor (C2A, not populated) for gate drive bootstrap.

Key Specifications

Availability

EV2233-J-00A is available at Aetrix Electronics and suitable for notebook system power validation, flat-panel display I/O rail testing, and distributed DC/DC development requiring stable component supply and documented reference performance.

Supply support for EV2233-J-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 MP2233 product line targets space-constrained, high-efficiency point-of-load applications - specifically enabling compact, thermally robust 3A buck regulation in consumer and computing systems where board area and efficiency are critical.

FAQ

What input voltage range is supported by the EV2233-J-00A board?

The board accepts 5V to 16V DC input, matching the MP2233 IC's operational range. Testing per Rev.1.0 confirms stable 3.3V/3A output across this span with ≤2% line regulation, using the onboard 1.5μH inductor and specified input capacitance.

Can the output voltage be adjusted, and how?

Yes - the board ships with R1=40.2kΩ and R2=13kΩ to set 3.3V, but VOUT is adjustable from 0.8V using the FB pin and external resistor divider. The MP2233's 0.8V reference allows precise scaling; no hardware modification beyond resistor replacement is required.

Does the board include thermal protection verification?

Yes - the MP2233 integrates thermal shutdown, and the EV2233-J-00A layout uses exposed pad grounding and copper pour to dissipate heat. Test data shows automatic recovery after thermal fault, consistent with MPS's hiccup-mode OCP and thermal foldback behavior.

Is synchronization to an external clock possible?

Yes - the EN/SYNC pin supports both enable control and external clock synchronization. Driving SYNC with a 1.4MHz ±15% square wave locks switching frequency; the board includes series resistor R10 (10Ω) and pull-down R9 (24kΩ) to interface directly with standard logic-level clocks.

What inductor is used, and why is it critical?

The board uses Wurth 744311150: a 1.5μH, 11A saturation-current, shielded power inductor with 10mΩ DCR. Its low resistance minimizes conduction loss, while shielding contains EMI - both essential for achieving >92% peak efficiency at 3A per test reports.

How is soft-start implemented on this evaluation board?

Soft-start is externally programmable via capacitor C5 (22nF) connected to the SS pin. This sets a controlled 2.5ms output ramp time, preventing inrush current into downstream capacitance and ensuring reliable startup under varying load conditions.