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Optoelectronics/Displays??

Linear Tech LED driver can drive up to 17 LED current sources

Posted: 15 Aug 2005 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? ltc3208? led driver?

Linear Technology Corp. announced a fully integrated, 850kHz, low noise, high efficiency 1x/1.5x/2x charge pump multi-display LED driver. The new LTC3208 can drive up to 17 LED current sources: a 1-4 LED main display, 1-2 LED sub display, a 1-3 LED RGB display, a 1-4 camera LED display, and a 1-4 LED Auxiliary display, all from a 5-by-5mm QFN package.

The company explained that each display has digital control with independent dimming and programming via a two-wire I?C serial interface. The LTC3208's input voltage range of 2.9V to 4.5V is optimized for single cell Li-ion cellular applications. Efficiencies when driven from a Li-ion battery (3.6V nominal) reach 95 percent with quiescent current of 250?A. Linear Tech said this maximizes battery run-time.

The LTC3208 requires only four small capacitors and one resistor to create a tiny, low profile (<34mm?, 0.75mm high) solution footprint capable of powering all LEDs used in five separate displays.

In addition, the new product automatically optimizes efficiency based on VIN and LED forward voltage conditions. It powers up in 1x mode and automatically switches to boost mode (1.5x) when any enabled LED current source approaches dropout. A subsequent dropout switches the part into 2x mode. Maximum currents for the Main/Sub/RGB/CAM/Aux displays are set with a single resistor. The LED currents are controlled with precision internal current sources while dimming, and ON/OFF control for all displays are achieved via a 2-wire I?C serial interface. Additionally, internal circuitry prevents inrush current and excessive input noise during start-up and mode switching.

The LTC3208EUH is available from stock in a 32-lead QFN (5-by-5mm) package. Pricing starts at $2.55 each for 1,000-piece quantities.




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