Datasheet4U Logo Datasheet4U.com

LM3644 - Dual 1.5-A Current Source Camera Flash LED Driver

General Description

The LM3644 is a dual LED flash driver that provides a high level of adjustability within a small solution size.

The LM3644 utilizes a 2-MHz or 4-MHz fixedfrequency synchronous boost converter to provide power to the dual 1.5-A constant current LED sources.

Key Features

  • 1 Dual Independent 1.5-A LED Current Source Programmability.
  • Accurate and Programmable LED Current Range from 1.4 mA to 1.5 A.
  • Torch Currents up to 360 mA (LM3644TT).
  • Flash Timeout Values up to 1.6 seconds (LM3644TT).
  • Optimized Flash LED Current During Low Battery Conditions (IVFM).
  • > 85% Efficiency in Torch Mode (at 100 mA) and Flash Mode (at 1 A to 1.5 A).
  • Grounded Cathode LED Operation for Improved Thermal Management.
  • Sma.

📥 Download Datasheet

📁 Similar Datasheet

Part Number Description Manufacturer
LM3641 Lithium-Ion Battery Pack Protection Circuit National Semiconductor
LM3643-11 THREE DIGIT DISPLAY Ledtech
LM3647 Universal Battery Charger National Semiconductor
LM360 High Speed Differential Comparator National Semiconductor
LM361 High Speed Differential Comparators National Semiconductor

Other Datasheets by Texas Instruments

Part Number Description
LM3644TT Dual 1.5-A Current Source Camera Flash LED Driver
LM3642 1.5-A Synchronous Boost LED Flash Driver
LM3643 Synchronous Boost Dual LED Flash Driver
LM3643A Synchronous Boost Dual LED Flash Driver
LM3646 1.5-A Synchronous Boost Converter

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3644, LM3644TT SNVSA52E – AUGUST 2014 – REVISED SEPTEMBER 2016 LM3644 Dual 1.5-A Current Source Camera Flash LED Driver 1 Features •1 Dual Independent 1.5-A LED Current Source Programmability • Accurate and Programmable LED Current Range from 1.4 mA to 1.5 A • Torch Currents up to 360 mA (LM3644TT) • Flash Timeout Values up to 1.6 seconds (LM3644TT) • Optimized Flash LED Current During Low Battery Conditions (IVFM) • > 85% Efficiency in Torch Mode (at 100 mA) and Flash Mode (at 1 A to 1.