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Compact linear LED drivers save space

Posted: 09 Aug 2010 ?? ?Print Version ?Bookmark and Share

Keywords:Linear LED Driver? portable devices? backlighting?


Fairchild Semiconductor's FAN5622/24/26 are 2ch/4ch/6ch LED drivers targeting handheld devices such as handsets and glucometers. The drivers highlight very small footprints and reduce overall component count by eliminating additional passive components used in charge pumps and series boost LED drivers.

The FAN5622/24/26 facilitate driving LEDs without an inductor or flyback capacitors, with a very low dropout voltage of 50mV. The brightness levels of the LED outputs are programmed through a single-wire control interface, while users can program 32 linear dimming steps and turn on and off the LEDs through this interface by applying digital pulses. This enables greater dimming resolution using a simple methodology to control functionality. These LED drivers also have a high peak efficiency of 92 percent, thereby extending battery life in portable applications.

For design and component engineers, these LED drivers are cost-effective and offer a simplistic-design, minimizing the overall solution space compared to a charge pump solution or an inductive boost solution. The FAN5622/24/26 reduces the overall bill of materials (BOM) and accelerates time-to-market for portable designs that do not require a complex lighting solution.

Other noteworthy features include a wide input voltage range (2.7V to 5.5V), short-circuit, under-voltage and thermal protection and less than 1?A shut-down current. The FAN5624, available in micro-MLP packaging (1.4mm x 1.8mm), is nearly 60 percent smaller than competing solutions, while the FAN5626, packaged in the 1.6mm x 2.1mm MicroPAKTM MLP, is nearly 20 percent smaller.

These FAN5622/24/26 are part of Fairchild's comprehensive portfolio of LED drivers that improve efficiency to meet strict energy efficiency standards, reduce component count and simplified designs in today's portable electronic device.

Unit prices for minimum orders of 1,000 are $0.47 each for the FAN5622, $0.55 for the FAN5624 and $0.63 for the FAN5626. Samples are now available.

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