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White LED driver integrates Schottky diode

Posted: 08 Mar 2006 ?? ?Print Version ?Bookmark and Share

Keywords:LT3491? white LED driver? Linear Technology?

Linear Technology Corp. announced the LT3491, a constant current white LED driver. The LT3491 features an integrated Schottky diode on-chip. A high-side LED current sense topology enables the LED cathode to be connected directly to ground, creating a single wire current source. The LT3491 is designed to drive up to six white LEDs from a single Li-ion cell at efficiencies over 75 percent. It switches at 2.3MHz, allowing the use of a tiny inductor and capacitors while keeping switching noise out of critical RF frequency bands. According to Linear, the product is ideal for handheld applications requiring up to six white LEDs.

The LT3491 acts as a constant current source, delivering the same current to each white LED, regardless of fluctuations in the LED's forward voltage drop which varies with temperature, manufacturing tolerances and age. This is said to ensure uniform LED brightness. The LT3491 utilizes True Color PWM dimming to offer wide dimming ranges of up to 300:1. Internal over-voltage circuitry protects the part when LEDs are disconnected.

The LT3491 is available from stock in an 8-lead SC70 package. Pricing starts at $1.25 for 1,000-piece quantities.




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Related Datasheets
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? LT3491 White LED Driver in SC70 with Integrated Schottky ICs, Interface

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