Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3454
Edited by the Electronicstalk Editorial
Team on 30 March 2006
Convertor powers single high-current
white LED
A synchronous buck-boost DC/DC convertor is optimised for driving a single high-current white LED at up to 1A from a single Li-ion battery input.
Linear Technology has announced the LTC3454, a synchronous buck-boost DC/DC convertor optimised for driving a single high-current white LED at up to 1A from a single Li-ion battery input The regulator operates automatically in either a synchronous buck, synchronous boost or buck-boost mode, depending on input voltage and LED maximum forward voltage
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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This is of particular importance in high current LED applications, as the LED forward voltage can vary from 2.7 to 4.9V depending on current level.
Using a proprietary architecture, efficiency of 90% can be achieved over the entire usable range of a Li-ion battery (2.7 to 4.2V).
Furthermore, the LED current is programmable to one of four levels (including shutdown) with dual current setting resistors and dual enable pins.
In shutdown, the supply current is less than 1uA.
A high constant operating frequency of 1MHz allows the use of a small inductor.
The LTC3454 is offered in a low profile (0.75mm) thermally enhanced 10-lead (3 x 3mm) DFN package.
The LTC3454EDD is available from stock.
Pricing starts at $1.95 each for 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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