Monolithic Power Systems Inc. EV3305DD-00A

Overview

EV3305DD-00A from Monolithic Power Systems is a fully assembled and tested evaluation board for the MP3305DD monolithic step-up white LED driver IC, designed to drive 30 white LEDs (3-series × 10-parallel strings) at 200mA total current from a 5V input, featuring fixed-frequency current-mode control, 50kHz true PWM dimming, and programmable open-load over-voltage protection.

For engineers reviewing the EV3305DD-00A datasheet, EV3305DD-00A pinout, EV3305DD-00A application, or EV3305DD-00A equivalent, this board enables rapid validation of MP3305DD-based WLED backlighting designs in compact portable displays with efficiency up to 88%, low 200mV feedback voltage, and integrated thermal/UVLO/current-limit protection.

Technical Context

The EV3305DD-00A implements the MP3305DD's fixed-frequency (1.3MHz typical) current-mode boost architecture, using an external 2µH power inductor (D53LC-#A915AY-2R0M), 1Ω current-sense resistor (RC0805FR-071RL), and 160kΩ/10kΩ OVP divider to set ~18.5V shutdown threshold. It supports true PWM dimming via EN pin modulation between 250Hz–50kHz.

Board-level design includes input filtering (4.7µF/0805 ×2), output capacitance (2.2µF/0805), Schottky catch diode (B0530W), and layout-optimized thermal pads for the QFN8 (2mm × 3mm) MP3305DD-LF-Z, with all critical components pre-installed and verified per Rev. 1.0 schematic.

Key Specifications

Availability

EV3305DD-00A is available at Aetrix Electronics and suitable for backlight evaluation in cell phones, handheld computers/PDAs, digital still cameras, and small LCD displays requiring stable component supply, repeatable test conditions, and production-ready reference design validation.

Supply support for EV3305DD-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, motor drivers, and battery management solutions.

The MP3305DD product line targets space-constrained portable backlight applications, delivering high-efficiency, low-noise, and thermally robust WLED driving from single-cell Li-ion or 5V sources with minimal external components.

FAQ

What is the primary function of the EV3305DD-00A evaluation board?

The EV3305DD-00A is a ready-to-use hardware platform for evaluating the MP3305DD step-up white LED driver IC. It validates key performance metrics-including efficiency, PWM dimming response, OVP behavior, and thermal stability-under real-world 30-LED (3×10) backlight loads powered by 5V input, with all critical passives and layout optimized per MPS reference design.

How is LED current set on this board?

LED current is set by the 1Ω, 1%, 0805 current-sense resistor (R3) connected to the ISET pin of the MP3305DD. With a 200mV feedback reference, this yields 200mA total current (20mA per string across 10 parallel strings), confirmed by the Bill of Materials and schematic on page 3 of the Rev. 1.0 document.

Can the EV3305DD-00A operate from a single-cell lithium-ion battery?

Yes-the MP3305DD IC on this board supports input voltages down to the minimum operating range of the IC (2.7V to 5.5V per MP3305DD datasheet), making it compatible with single-cell Li-ion batteries (nominal 3.7V, range ~2.8V–4.2V). The board's 5V labeling reflects its optimized test condition, not an absolute input limitation.

What protection features are implemented and how are they activated?

The board implements MP3305DD-integrated protections: under-voltage lockout (UVLO) triggers below ~2.5V VIN; cycle-by-cycle current limiting responds to peak inductor current; thermal shutdown activates above ~150°C junction temperature; and open-load OVP shuts down the IC when LED+ voltage exceeds ~18.5V, set by R5/R6 (160kΩ/10kΩ) divider on the OVP pin.

Is the board compatible with other MP3305 variants or packages?

No-the EV3305DD-00A is specifically designed for the MP3305DD in 8-pin QFN (2mm × 3mm) package (MP3305DD-LF-Z). Pinout, layout, and component values (e.g., R3 = 1Ω, L1 = 2µH) match only this variant. Substituting MP3305 variants (e.g., MP3305DJ or different suffixes) may cause functional mismatch due to differing OVP thresholds, enable logic, or internal compensation.