Monolithic Power Systems Inc. EV3209DJ-00A

Overview

EV3209DJ-00A from Monolithic Power Systems is an evaluation board for the MP3209DJ 1.3MHz current-mode boost converter IC, designed to validate 2.5–6V input-to-15V/350mA output power conversion in space-constrained applications. It integrates the MP3209DJ in TSOT23-5 package, a 22μH shielded inductor, B0530W Schottky diode, and precision feedback resistors enabling fixed 15V output with internal soft-start and thermal shutdown.

For engineers reviewing the EV3209DJ-00A datasheet, EV3209DJ-00A pinout, EV3209DJ-00A application, or EV3209DJ-00A equivalent, this board supports rapid validation of high-frequency (1.3MHz) boost topology performance-including efficiency vs. load current (up to 92% at 30mA), startup behavior under low VIN (2.5V), and output voltage adjustability via R4.

Technical Context

The EV3209DJ-00A implements a complete, pre-tuned boost converter reference design centered on the MP3209DJ IC, which uses peak-current-mode control with fixed 1.3MHz switching frequency and internal compensation. Its layout adheres to high-frequency PCB best practices: minimized SW node area, ground plane continuity, and strategic placement of 10μF/1210 input cap and 4.7μF/1210 output cap to suppress ripple.

Board-level protection includes UVLO activation at ~2.3V, cycle-by-cycle current limiting set by internal MOSFET R_DS(on), and thermal shutdown triggered above 150°C. Output voltage is set by resistor divider (R2=499kΩ, R4=45.3kΩ) yielding V_FB=1.25V reference compliance for 15V output.

Key Specifications

Availability

EV3209DJ-00A is available at Aetrix Electronics and suitable for cell phone power rail validation, OLED display bias supply qualification, and external modem DC-DC subsystem prototyping requiring stable component supply and documented thermal performance.

Supply support for EV3209DJ-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 EV3209DJ-00A belongs to MPS's evaluation board product line, developed specifically to accelerate adoption of their high-frequency, ultra-compact boost converters in portable and space-sensitive applications.

FAQ

What input voltage range is supported, and what happens below 2.5V?

The EV3209DJ-00A accepts 2.5V to 6V input. Below ~2.3V, the MP3209DJ's under-voltage lockout (UVLO) disables switching to prevent erratic operation and excessive inrush current. No output is generated until VIN rises above the UVLO threshold with hysteresis.

How is the 15V output voltage set, and can it be changed?

VOUT is set by the R2/R4 feedback divider (R2 = 499kΩ, R4 = 45.3kΩ) to achieve V_FB = 1.25V. Yes - replace R4 per the formula VOUT = V_FB × (1 + R2/R4); standard 1% resistors up to 22V output are supported with appropriate capacitor voltage ratings.

Does the board include thermal protection, and how is it implemented?

Yes - thermal shutdown is implemented via the MP3209DJ's internal die temperature sensor. When junction temperature exceeds ~150°C, the IC halts switching and holds EN inactive until temperature drops by ~20°C hysteresis, preventing permanent damage during sustained overload or poor airflow.

What is the maximum achievable output current, and what limits it?

Maximum continuous output current is 350mA at room temperature with adequate airflow. It is limited by the MP3209DJ's internal current-sense threshold (~1.2A peak switch current), thermal resistance of the TSOT23-5 package on this PCB, and RMS current rating of the VLCF4018-220MR49-2 inductor (0.49A).

Is the EN pin accessible, and how is enable/disable controlled?

Yes - the EN pin is routed to a test point and labeled "EN" on the silkscreen. The MP3209DJ powers up automatically when VIN is applied. To disable, short the EN test point to GND; this forces the IC into low-quiescent-current shutdown mode (<1μA I_Q).

Which components on the board are critical for EMI performance?

The 10μF/1210 X5R input capacitor (C1), 4.7μF/1210 X7R output capacitor (C3), and shielded 22μH inductor (L1) are critical for EMI suppression. Their placement minimizes loop area of the high-di/dt SW node, and C1/C3 provide low-impedance paths for high-frequency switching currents.