Monolithic Power Systems Inc. EV3430-Q-00A

Overview

EV3430-Q-00A from Monolithic Power Systems is a dedicated evaluation board for the MP3430GQ monolithic 90V step-up converter with integrated APD current monitoring. It implements a fixed-frequency (1.3MHz), current-mode boost topology delivering up to 50V output at 2mA, featuring dual-ratio (1:10 and 1:2) high-side APD current monitor outputs and programmable over-current protection for optical receiver biasing applications.

For engineers reviewing the EV3430-Q-00A datasheet, EV3430-Q-00A pinout, EV3430-Q-00A application, or EV3430-Q-00A equivalent, this board enables rapid validation of APD bias voltage stability, APD current monitoring accuracy under optical transients, dynamic VOUT adjustment via ADJ pin, and thermal shutdown behavior in fiber-optic module designs.

Technical Context

The EV3430-Q-00A implements the MP3430GQ IC in a fully assembled, tested configuration with optimized layout for high-voltage switching and low-noise APD current sensing. It integrates a 100V/0.8Ω internal N-FET, 2.2µH power inductor (Toko DEM2815C), and precision resistor network (R5, R6, R2) for output voltage and APD current limit programming.

Board-level features include soft-start, internal compensation, 50ns APD monitor response speed, ±5% APD current monitor tolerance, and thermal shutdown. The ADJ pin supports analog voltage-based dynamic output control, while R13 enables fine-tuning of the ADJ transfer function per the provided formula.

Key Specifications

Availability

EV3430-Q-00A is available at Aetrix Electronics and suitable for fiber-optic transceiver development, optical receiver module qualification, and APD/PIN diode bias circuit prototyping requiring stable component supply, traceable evaluation hardware, and documented reference design implementation.

Supply support for EV3430-Q-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 sensor signal conditioning.

The MP3430 product line is designed specifically for high-voltage optical receiver biasing, integrating precision APD current monitoring and robust over-current protection into a single 3×3mm QFN16 package to simplify fiber-optic module design.

FAQ

What is the default output voltage setting on the EV3430-Q-00A board?

The board is factory-configured for 50V output using R5 = 1MΩ and R6 = 16.2kΩ per the formula V_OUT = 0.8 × (1 + R5/R6). This setting meets typical APD bias requirements in GPON and XFP modules while maintaining margin below the 90V absolute maximum rating.

How is APD current limiting implemented and adjusted?

APD over-current protection is set by R2 (30kΩ default), where I_APD,MAX = 68 / R_RLIM (kΩ) mA. Replacing R2 with a 15kΩ resistor raises the limit to 4.53mA; a 60kΩ resistor reduces it to 1.13mA. This direct resistor-to-current mapping ensures predictable, repeatable protection without calibration.

Can the output voltage be dynamically controlled, and how?

Yes - applying a 0.8V–2.5V analog voltage to the ADJ pin adjusts V_OUT per the formula V_OUT = 0.8 × (1 + R5/R6) + 0.8 × (V_ADJ − 0.8) × (R5/R13). With R13 unpopulated (NS), ADJ functions as an enable/disable control; with R13 = 0Ω, full analog modulation is enabled.

What are the key layout features that support APD current monitoring accuracy?

The board uses Kelvin-connected sense traces for the APD monitor outputs (pins 12 and 13), separate ground return paths for power and analog sections, and localized 0.1µF/10µF ceramic decoupling at U1 pins 1, 2, and 14. These minimize noise coupling and ensure <±5% monitor tolerance under 50ns optical transients.

Is thermal shutdown active on this evaluation board, and how is it verified?

Yes - thermal shutdown is enabled via the MP3430GQ's internal circuitry and activates at T_J ≥ 150°C. During sustained 2mA loading at 50V output and 5.5V input, board temperature stabilizes at ≤75°C on a standard 2-layer FR4 test fixture, confirming safe operation within thermal limits without forced airflow.

Does the board support both 1:10 and 1:2 APD current monitor outputs simultaneously?

Yes - pins 12 (1:10) and 13 (1:2) provide independent, buffered APD current monitor outputs referenced to GND. Each has its own 0.1µF/1210 ceramic filter (C3, C4) and can drive 10kΩ loads with <1% gain error, enabling concurrent coarse-range and fine-resolution APD current measurement in closed-loop bias control systems.