LM3405AEVAL

1.6MHz, 1A Constant Current Buck LED Driver with Internal Compensation in Tiny SOT-23 Package Evalu

LM3405AEVAL

Order now

Overview

The LM3405A demo board is configured to drive a series string of high power, high brightness LEDs at a forward current of 1A using the LM3405A constant current buck regulator. The board can accept a full input operating range of 3V to 22V. The converter output voltage adjusts as needed to maintain a constant current through the LED array. The LM3405A is a step-down regulator with an output voltage range extending from a VO(MIN) of 205mV (the reference voltage) to a VO(MAX) determined by the maximum duty cycle (typically 94%). It can drive up to 5 LEDs in series at 1A forward current, with the single LED forward voltage of approximately 3.7V (Typical of white, blue, and green LEDs using InGaN technology).

Features
  • VIN operating range of 3V to 22V
  • Drives up to 5 High-Brightness LEDs in series at 1A
  • Thin SOT23-6 package
  • 1.6MHz switching frequency
  • EN/DIM input for enabling and PWM dimming of LEDs
  • 300mΩ NMOS switch
  • 40nA shutdown current at VIN = 5V
  • Internally compensated current-mode control
  • Cycle-by-cycle current limit
  • Input voltage UVLO
  • Over-current protection
  • Thermal shutdown

Applications:

  • LED Driver
  • Constant Current Source
  • Industrial Lighting
  • LED Flashlights
  • LED Lightbulbs

 

Illumination LED drivers
LM3405A 1.6-MHz, 1-A constant current buck LED driver with internal compensation

Order & start development

Evaluation board

LM3405AEVAL/NOPB – 1.6MHz, 1A Constant Current Buck LED Driver with Internal Compensation in Tiny SOT-23 Package

TI's Standard Terms and Conditions for Evaluation Items apply.

Technical documentation

star
= Top documentation selected by TI
No results found. Please clear your search and try again.
View all 4
Type Title Date
* User guide AN-1685 LM3405A Demo Board (Rev. B) May 01, 2013
More literature LM3405AEVAL/NOPB EU Declaration of Conformity (DoC) Jan. 02, 2019
Application note Powering & Dimming High-Brightness LEDs w/ LM3405 Constant-Current Buck Reg (Rev. A) May 01, 2013
User guide LM3405A Reference Design for MR16 LED Bulb, 600mA User Guide Jan. 27, 2012

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​

Videos