Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LT3486
Edited by the Electronicstalk Editorial Team on 21 November 2005
Convertor drives dual LED strings
The LT3486 is a dual step-up DC/DC convertor specifically designed to drive up to 16 white LEDs (eight in series per channel) with constant current.
Linear Technology has announced the LT3486, a dual step-up DC/DC convertor specifically designed to drive up to 16 white LEDs (eight in series per channel) with constant current In addition true PWM dimming delivers constant current to the LEDs, keeping the emitted light at a constant colour
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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Dimming is controlled with the duty cycle of the PWM driver.
This method allows for a wide 1000:1 dimming range.
The LT3486's high efficiency, current mode and fixed frequency operation ensures uniform LED brightness, low noise and maximum battery life.
Its two independent convertors are capable of driving asymmetric LED strings (up to eight in a series per convertor) from an input voltage of 2.5 to 24V, delivering efficiencies up to 85%.
Its 5 x 3mm DFN package and tiny externals provide a very compact footprint for space-constrained handheld applications.
Its 2.5 to 24V input voltage range enables it to operate in applications from Li-ion powered handheld devices to automotive backlighting applications.
The LT3486 switching frequency can be set between 200kHz and 2MHz via a single resistor, enabling the designer to minimise solution footprint and maximise efficiency.
Because the LT3486 uses constant frequency architecture, noise is minimised, eliminating potential interference with any onboard RF or audio circuitry.
Additional features include internal soft-start/inrush current limiting, and open LED protection.
The combination of the LT3486's high efficiency, versatility, low noise, and extremely small "total solution" footprint make it ideal for a variety of backlighting applications requiring many white LEDs in a space constrained form factor.
The LT3486EDHC is available from stock in a 5 x 3mm DFN-16 package, whereas the LT3486EFE is in a TSSOP-16E package.
Pricing starts at $2.50 each and $2.60 each, respectively, for 1000 piece quantities.
Both parts are available from stock. Request a free brochure from Linear Technology Corp ...
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