Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3490
Edited by the Electronicstalk Editorial Team on 15 August 2005
Compact driver supplies 1W for LEDs
The LTC3490 is a synchronous boost DC/DC convertor optimised for driving high current white LEDs.
Linear Technology has released the LTC3490, a synchronous boost DC/DC convertor optimised for driving high current white LEDs The LTC3490 operates at up to 90% efficiency, maximising battery run time, and its input voltage range of 1 to 3.2V enables it to deliver up to 350mA from either a single or dual cell alkaline/NiMH battery
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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Its output voltage range of 2.8 to 4V is fully compliant with the forward voltage requirements of high current LEDs.
The LTC3490 provides constant current drive for LED applications requiring up to 1W of power.
Its 3 x 3mm DFN package (or SO-8) and 1.3MHz switching frequency offer a tiny solution footprint for handheld applications.
When the LTC3490's output load is disconnected, it limits the output voltage to 4.7V, providing enhanced system reliability.
Onboard analogue dimming capability reduces the LED drive current proportionally to the CTRL/ pin voltage.
A low-battery logic output signals when the battery voltage has dropped below 1V, and at 0.85V/cell, its undervoltage lockout circuit shuts down the LTC3490 for added protection.
The LTC3490 offers the most compact 1W LED driver solution for portable lighting and rechargeable flashlight applications.
The LTC3490 is available from stock in either a 3 x 3mm DFN or SO-8 package.
Pricing starts at $2.10 each for 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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