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Tiny LED driver powers 10 50mA LEDs

Posted: 16 Oct 2007 ?? ?Print Version ?Bookmark and Share

Keywords:buck mode DC/DC converter? constant-current LED driver?

Linear Technology Corp. has announced the LT3590, a 48V, buck mode DC/DC converter designed to operate as a constant-current LED driver.

An internal 55V, 80mA switch and Schottky diode enable it to drive up to ten 50mA LEDs in a single series string from a 48V input, making it well suited for industrial and LED signage applications. Series connection of the LEDs provides identical LED currents up to 50mA, resulting in uniform brightness and eliminating the need of ballast resistors.

Dimming is adjusted via the CTRL pin and ratios as high as 200:1 can be attained. Its switching frequency of 850kHz enables the use of tiny inductors and ceramic capacitors while providing efficiency as high as 91 percent. Combined with a 2mm x 2mm DFN or SC-70 package, it offers a very compact solution for driving high current LEDs.

The LT3590 utilizes a fixed frequency current mode architecture which offers stable operation over a wide range of input and output voltages. A 200mV feedback voltage offers 5 percent accuracy, ensuring consistent LED brightness.

The LT3590 is available from stock in either a 2mm x 2mm DFN-6 or 8-lead SC-70 package. Pricing for 1,000-piece quantities starts at $1.40 each for both versions.

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