LM3554 PDF Datasheet


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Description

This is 1.2A Dual Flash LED Driver System. LM3554 PRODUCT BRIEF June 8, 2009 LM3554 PRODUCT BRIEF Synchronous Boost Converter with 1.2A Dual High Side LED Drivers and I2C Compatible Interface General Description The LM3554 is a 2 MH- fixed frequency, current mode synchronous boost converter. The device is designed to operate as a dual 600mA (1.2A total) constant current driver for high current white LEDs, or as a regulated 4.5V or 5V voltage source. The dual high side current sources allow for grounded cathode LED operation. An adaptive regulation method ensures the current source for each LED remains in regulation and maximizes efficiency. The main features include: an I2C compatible interface for controlling the LED current or the desired output voltage, a hardware Flash enable input for direct triggering of the Flash pulse, and dual TX inputs which force the Flash pulse into a low current Torch mode allowing for synchronization to RF power amplifier events or other high current conditions. Additionall.