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LM3556 Datasheet 1.5-A Synchronous Boost LED Flash Driver

Manufacturer: Texas Instruments

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General Description

The LM3556 is a 4-MHz fixed-frequency synchronous boost converter plus 1.5-A constant current driver for a high-current white LED.

The high-side current source allows for grounded cathode LED operation providing flash current up to 1.5 A.

An adaptive regulation method ensures the current source remains in regulation and maximizes efficiency.

Overview

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3556 SNVS796D – AUGUST 2011 – REVISED OCTOBER 2015 LM3556 1.

Key Features

  • 1 Grounded Cathode LED Operation for Improved Thermal Management.
  • 1.5-A High-Side Current Source for Single LED.
  • Accurate and Programmable LED Current from 46.9 mA to 1.5 A.
  • > 85% Efficiency in Torch Mode (at 100 mA) and Flash Mode (at 1 A to 1.5 A).
  • Small Solution Size: < 20 mm2.
  • LED Thermal Sensing and Current Scale-Back.
  • Soft-Start Operation for Battery Protection.
  • Hardware Enable Pin.
  • Hardware Torch Enable.

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