Monolithic Power Systems Inc. EV3221-J-00A

Overview

EV3221-J-00A from Monolithic Power Systems is an evaluation board for the MP3221GJ 1.2MHz step-up DC/DC converter IC, featuring integrated input disconnect driver, 2.7A switch current limit, and true output-to-input isolation. It supports 2.5–4.8V input and delivers up to 1A at 5V using a TSOT23-6 packaged controller with external PMOS (FDMA905P), inductor (2.2µH), and dual ceramic output capacitors (10µF + 22µF).

For engineers reviewing the EV3221-J-00A datasheet, EV3221-J-00A pinout, EV3221-J-00A application, or EV3221-J-00A equivalent, this board enables rapid validation of MP3221-based boost converter designs with input disconnection, soft-start, short-circuit protection, and <1µA shutdown current in portable battery-powered systems.

Technical Context

The EV3221-J-00A implements a fixed-frequency (1.2MHz) current-mode boost topology centered on the MP3221GJ controller, which drives an external high-side PMOS (FDMA905P) to achieve true input-output disconnect during shutdown or fault. The board integrates internal compensation and soft-start, eliminating need for external loop compensation components.

It uses a 2.2µH shielded power inductor (TDK RLF7030-2R2M5R4) rated for 5.5A saturation current, paired with low-ESR 1210 X5R ceramic capacitors (10µF/22µF @ 10V) and dual Schottky diodes (B220 + 1N5819) for redundancy and layout flexibility - supporting stable 5V/1A output from 3V input with <10% load regulation.

Key Specifications

Availability

EV3221-J-00A is available at Aetrix Electronics and suitable for portable media players, wireless peripherals, and handheld computing devices requiring stable component supply, fast prototyping turnaround, and validated boost converter reference design with input disconnection.

Supply support for EV3221-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 MP3221 product line targets ultra-low-power portable applications requiring compact, efficient boost conversion with integrated safety and battery-preserving features like true output disconnect and sub-µA shutdown.

FAQ

What is the primary function of the FDMA905P MOSFET on the EV3221-J-00A board?

The FDMA905P is a P-channel MOSFET driven by the MP3221GJ's FAULT pin to physically disconnect the output from the input during shutdown or short-circuit events. This enables true output discharge and reduces system off-state current to under 1µA, extending battery life in always-on portable devices.

Can the output voltage be adjusted, and how is it set?

Yes, the output voltage is adjustable via the R2/R3 resistor divider network connected to the FB pin. With VFB = 0.8V, setting R2 = 536kΩ and R3 = 100kΩ yields 5V output. The Application Information section of the MP3221 datasheet provides the exact formula and recommended tolerance (1%) for precision tuning.

Does the board include EMI mitigation features?

Yes - the board uses a shielded 2.2µH power inductor (TDK RLF7030-2R2M5R4), low-ESR 1210 ceramic capacitors, and optimized high-current loop layout per MPS reference design guidelines. These reduce radiated emissions and improve stability at 1.2MHz switching frequency without requiring external filters.

What is the role of the two Schottky diodes (B220 and 1N5819)?

The B220 (20V/2A) serves as the primary boost rectifier; the 1N5819 (40V/1A) is included as a secondary option for higher-voltage or higher-reliability configurations. Both are SMA/SOD-123 packaged Schottky diodes selected for low forward voltage and fast recovery to minimize conduction loss and improve efficiency.

How is enable/disable control implemented on this board?

Enable/disable is controlled via the EN pin of the MP3221GJ. Driving EN >1.3V (e.g., logic HIGH) enables regulation; driving EN <0.5V (e.g., grounded) disables the converter and activates the FAULT-driven PMOS disconnect. No pull-up/pull-down resistors are required - the pin has internal biasing per datasheet.

Is thermal performance characterized on this evaluation board?

Yes - the board layout places the MP3221GJ (TSOT23-6) and FDMA905P (MicroFET-2x2) on thermally optimized copper areas. Typical performance data shows stable operation at 1A/5V with ≤25°C temperature rise above ambient at TA=25°C, verified using IR imaging per Rev. 1.0 test report.