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LM3553 - 1.2A Dual Flash LED Driver System

Description

The LM3553 is a fixed frequency, current mode step-up DC/ DC converter with two regulated current sinks.

The device is capable of driving loads up to 1.2A from a single-cell Li-Ion battery.

Features

  • Accurate and Programmable LED Current up to 1.2A in.
  • 128 Steps Total Solution Size < 30mm2 90% Peak Efficiency Drives 2 LEDs in Series with 1.2A from 5V Input Drives 2 LEDs in Series with 600mA from 3.0V Input Drives 1 LED with 1.2A from 3.0V Input Adjustable Over-Voltage Protection Allows for Single or Series LED Operation Four Operating Modes: Torch, Flash, Indicator, and Voltage Mode (4.98V) Programmable.

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LM3553 1.2A Dual Flash LED Driver System with I2C Compatible Interface www.DataSheet4U.com March 6, 2008 LM3553 1.2A Dual Flash LED Driver System with I2C Compatible Interface General Description The LM3553 is a fixed frequency, current mode step-up DC/ DC converter with two regulated current sinks. The device is capable of driving loads up to 1.2A from a single-cell Li-Ion battery. One or more high current flash LEDs can be driven in series either in a high power Flash mode or a lower power Torch mode controlled by either an internal register or the FEN pin. Additionally a low current (20mA) indicator mode and a fixed output voltage mode are also available. The LM3553 has 128 current levels and 16 flash safety timer durations that are user adjustable via an I2C compatible interface.
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