Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3215
Edited by the Electronicstalk Editorial Team on 10 May 2005
Driver that delivers up to 700mA of LED
current
The LTC3215 is a fractional charge pump, high current white LED driver that delivers up to 700mA of LED current.
Linear Technology has announced the LTC3215, a fractional charge pump, high current white LED driver that delivers up to 700mA 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 LTC3215 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 very tiny footprint and cost-effective solution, ideally suited for video and flash applications in camera phones and other portable lighting applications.
The LTC3215 employs built-in soft-start circuitry which prevents excessive inrush current during startup.
An ultralow dropout current source maintains accurate LED current as the input voltage approaches the LED forward voltage.
The LTC3215 is available in a low profile (0.75mm), 3 x 3mm 10-lead DFN package.
The LTC3215EDD is available from stock in a DFN-10 package.
Pricing starts at $1.75 each for 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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