Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3216
Edited by the Electronicstalk Editorial Team on 07 March 2005
LED driver delivers up to 1A
The LTC3216 is a fractional charge pump, high current white LED driver that delivers up to 1A of LED current.
Available now from Linear Technology, the LTC3216 is a fractional charge pump, high current white LED driver that delivers up to 1A of LED current Its high efficiency multimode architecture automatically switches between 1x, 1.5x or 2x boost modes by monitoring the voltage across the LED current source and switching modes only when ILED dropout is detected
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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This enables the LTC3216 to maximise efficiency (up to 92%) throughout the entire Li-ion operating range.
A 900kHz switching frequency and a low external parts count (two flying capacitors, two programming resistors and two bypass capacitors at VIN and CPO) provide a tiny footprint ideally suited for video and flash applications in camera phone and other portable lighting applications.
The LTC3216 employs built-in soft-start circuitry which prevents excessive inrush current during start-up.
Independent high and low current settings for flash and torch/video modes respectively are programmed by two external resistors.
Shutdown mode and current output levels are selected via two logic inputs.
An ultralow-dropout-current source maintains accurate LED current as the input voltage approaches the LED forward voltage.
The LTC3216 is available in a low profile (0.75mm), 3 x 4mm 12-lead DFN package.
The LTC3216EDE is available from stock in a DFN-12 package.
Pricing starts at $2.00 each for 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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