Monolithic Power Systems Inc. EV2370DJ-00A

Overview

EV2370DJ-00A from Monolithic Power Systems is an evaluation board for the MP2370DJ monolithic step-down white LED driver IC, configured to drive a single 3W white LED at 770 mA output current with 1.2 A peak capability, 1.4 MHz switching frequency, and input voltage range of 6–24 V. It integrates a 0.35 Ω internal MOSFET and delivers up to 92% efficiency at VIN = 12 V.

For engineers reviewing the EV2370DJ-00A datasheet, EV2370DJ-00A schematic, EV2370DJ-00A bill of materials, or EV2370DJ-00A quick start guide, this board enables rapid validation of WLED driver performance, enable-controlled startup sequencing, thermal shutdown behavior, and output current tuning via external sense resistor R2 (200 mΩ default).

Technical Context

The EV2370DJ-00A implements a current-mode synchronous buck topology using the MP2370DJ IC in TSOT23-6 package. It supports 6–24 V input, delivers regulated constant current to a single white LED string, and features cycle-by-cycle overcurrent protection and thermal shutdown.

Board-level design includes a 4.3 µH power inductor (Toko A920CY-4R3M), 4.7 µF input capacitor (TDK C3216X7R1E475K), and precision 200 mΩ current-sense resistor (Kamaya RLC20-R200F) setting nominal 770 mA LED current per I_OUT = 0.15 V / R_SENSE.

Key Specifications

Availability

EV2370DJ-00A is available at Aetrix Electronics and suitable for white LED backlighting validation, portable lighting system prototyping, and distributed power architecture testing requiring stable component supply and pre-validated reference designs.

Supply support for EV2370DJ-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 mixed-signal ICs for power management, LED lighting, and motor control applications.

The EV2370DJ-00A belongs to MPS's evaluation board product line, designed specifically to accelerate adoption of their integrated LED drivers by providing fully assembled, tested, and documented reference platforms for system-level validation.

FAQ

What is the default LED output current on the EV2370DJ-00A?

The board is preset to deliver 770 mA constant current to a single 3W white LED, established by the 200 mΩ current-sense resistor R2. This value follows the MP2370DJ's internal 150 mV current-sense threshold and the formula I_OUT = 0.15 V / R_SENSE, confirmed in the Quick Start Guide.

How do I enable or disable the MP2370DJ regulator on this board?

Apply a logic-high signal (>2 V) to the EN pin to turn on the regulator; apply logic-low (<0.3 V) to disable it. The EN pin is accessible via test point or header, and the board powers up automatically when VIN is applied if EN is left floating high through internal pull-up (per MP2370DJ datasheet).

Can I adjust the output current beyond 770 mA?

Yes - replace R2 with a lower-value precision resistor (e.g., 125 mΩ for 1.2 A) using the formula I_OUT = 0.15 V / R_SENSE. R4 is marked "NS" (not stuffed) and can be populated for fine-tuning; both resistors must maintain 1% tolerance and appropriate power rating per application current.

What protection features are implemented and verified on this board?

The board demonstrates cycle-by-cycle overcurrent protection and thermal shutdown as implemented by the MP2370DJ IC. These are active during operation: current limiting engages immediately upon sensed switch current exceeding peak threshold, and thermal shutdown disables the IC when die temperature exceeds ~150 °C, with automatic recovery after cooldown.

Which components on the board are critical for EMI compliance?

The 4.3 µH shielded inductor (Toko A920CY-4R3M), 4.7 µF X7R ceramic input capacitor (TDK C3216X7R1E475K), and tight SW/GND loop layout minimize conducted and radiated emissions. Layout adherence to the provided top/bottom layer drawings (Figures 1–3) is essential to maintain the 1.4 MHz switching noise profile validated in the reference design.