Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3453
Edited by the Electronicstalk Editorial Team on 17 May 2005
Convertor goes up and down to power
white LEDs
The LTC3453 is a synchronous buck-boost DC/DC convertor optimised for driving high current white LEDs at up to 500mA from a single Li-ion battery input.
Linear Technology has released the LTC3453, a synchronous buck-boost DC/DC convertor optimised for driving high current white LEDs at up to 500mA 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 because the LED forward voltage can vary from 2.7 to 4.9V depending on current levels and LED tolerances.
The LTC3453's buck-boost topology can deliver 90% efficiency over the entire Li-ion voltage range of 2.7 to 4.2V.
Independent high and low current settings for flash and torch/video modes, respectively, can be easily programmed with dual current setting resistors and dual enable pins.
Efficiency of 90% can be typically achieved over the range of a Li-ion battery.
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 only 6uA.
The device protects itself under open or shorted LED conditions.
A high constant operating frequency of 1MHz allows the use of a small external inductor.
The LTC3453 is offered in a low profile (0.75mm), thermally enhanced 16-lead (4 x 4mm) QFN package.
The LTC3453EDD is available from stock in a QFN-16 package.
Pricing starts at $2.10 each for 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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