Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LT3491
Edited by the Electronicstalk Editorial
Team on 02 June 2006
LED driver saves space and power
A high-efficiency constant-current white LED driver housed in an SC70 package integrates a Schottky diode on-chip, eliminating both the added cost and space required with an external diode.
Linear Technology has announced the LT3491, a high-efficiency constant-current white LED driver housed in an SC70 package The LT3491 features an integrated Schottky diode on-chip, eliminating both the added cost and space required with an external diode
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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A unique 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%.
It switches at 2.3MHz, allowing the use of a tiny inductor and capacitors while keeping switching noise out of critical RF frequency bands.
The combination of the LT3491's high efficiency, low noise and extremely small "total solution" footprint make it 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 ensures uniform LED brightness.
The LT3491 uses true colour PWM dimming to offer wide dimming ranges of up to 300:1.
Internal overvoltage 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 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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