Texas Instruments LM3643EVM

Overview

LM3643EVM from Texas Instruments is an evaluation module designed to validate the LM3643 high-current dual LED flash driver in real-world camera flash and torch applications. It integrates the LM3643YFF DSBGA-12 IC, supports I²C-compatible configuration, enables external STROBE/TORCH/TEMP control via jumpers, and includes on-board ultra-white LEDs (OSRAM LUW CAEP.G4) for immediate functional testing.

For engineers reviewing the LM3643EVM datasheet, LM3643EVM pinout, LM3643EVM application, or LM3643EVM equivalent, this module provides hands-on validation of flash timing, current regulation (up to 1.5 A per channel), thermal management with NTC thermistor interface, and USB-based GUI control via TI's USB2ANY docking board.

Technical Context

The LM3643EVM implements a synchronous boost topology to drive two independent LED strings, each capable of up to 1.5 A output current. It interfaces directly with the LM3643YFF IC - a 0.4-mm-pitch, 12-bump DSBGA package - using dedicated test points (VIN, VOUT, LED1, LED2, TORCH/TEMP) and configurable jumpers for EN, STROBE, TX, and PWM signal routing.

Board-level features include precision 0.1 Ω current-sense resistors (R5/R6) for accurate LED current measurement, a 1 µH shielded inductor (Toko DFE201610P-1R0M), and support for both hardware-triggered operation and full register-level I²C control via SDA/SCL headers and USB2ANY interface.

Key Specifications

Availability

LM3643EVM is available at Aetrix Electronics and suitable for camera module development, mobile phone flash subsystem validation, and LED driver qualification requiring stable component supply and rapid prototyping capability.

Supply support for LM3643EVM 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

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and interface solutions.

The LM3643EVM belongs to TI's LED driver evaluation platform family, engineered specifically to accelerate design-in of high-efficiency, thermally aware flash drivers for smartphone, tablet, and portable imaging applications.

FAQ

What is the primary function of the LM3643EVM?

The LM3643EVM is a Texas Instruments evaluation module built to demonstrate and validate the LM3643 dual high-current LED flash driver. It enables engineers to verify flash/torch timing, current regulation accuracy, thermal foldback behavior, and I²C register control in a ready-to-use PCB format. The LM3643EVM includes all necessary passive components, test points, and jumper-configurable interfaces to replicate real camera subsystem conditions without custom hardware.

Does the LM3643EVM require external power, and what voltage range is supported?

Yes, the LM3643EVM requires external DC power applied via its VIN/GND terminal block. It operates across an input voltage range of 2.5 V to 5.5 V - matching typical single-cell Li-ion battery and USB VBUS supplies. The board includes VIO jumper options to power the I²C interface either from VIN or an external 3.3 V source, though I²C communication may fail if VIO drops below ~3 V while VIN remains low.

How is LED current measured on the LM3643EVM?

LED current is measured using precision 0.1 Ω sense resistors (R5 and R6) placed between each LED cathode and ground. By measuring the voltage drop across R5 (for LED1) or R6 (for LED2) during operation and applying Ohm's Law (I = V / 0.1), users obtain accurate real-time current values. The board provides dedicated test points (D1S/D2S and GNDS) to minimize probe loading and ensure measurement fidelity.

Can the LM3643EVM be used without the USB2ANY interface?

Yes - the LM3643EVM supports fully standalone operation using hardware control signals. Jumpers allow direct connection of STROBE, TORCH/TEMP, and TX pins to external logic or PWM sources, enabling flash/torch triggering without any PC or USB interface. The EN jumper permits hardware enable/disable, and the TORCH/TEMP jumper can be configured for NTC thermistor-based thermal protection - all independent of I²C or GUI software.

What safety and compliance information applies to the LM3643EVM?

The LM3643EVM is intended solely for laboratory evaluation and engineering development - not for consumer or end-product use. It is not FCC-certified as a standalone device and must not be deployed in production systems. Users assume full responsibility for safe handling, thermal management (especially during repeated flash events), and compliance with local RF, environmental, and disposal regulations. TI disclaims all liability beyond the 30-day return warranty for non-conformance to published specifications.