Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3210
Edited by the Electronicstalk Editorial Team on 27 April 2006
Charge pump drives main and camera LEDs
The LTC3210 is a highly integrated 800kHz low-noise high-efficiency 1x/1.5x/2x multimode charge pump for driving main and camera LEDs in cellular phones.
Linear Technology has announced the LTC3210, a highly integrated 800kHz low-noise high-efficiency 1x/1.5x/2x multimode charge pump for driving main and camera LEDs in cellular phones It provides five LED current sources at up to 500mA of total output current: a 4 x 25mA LED main display and one high-current 400mA camera LED display, all from a compact 3 x 3mm QFN package
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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Each display is digitally controlled with independent dimming and programming via a single wire interface.
The LTC3210's input voltage range of 2.9 to 4.5V is optimised for single cell Li-ion cellular applications.
Efficiencies when driven from a Li-ion battery (3.6V nominal) reach 95% with quiescent current of only 400uA, maximising battery run time.
High switching frequency enables the use of small external capacitors.
The LTC3210 requires only four small capacitors and two current set resistors to create a tiny, less than 20mm2, low-profile (0.75mm) solution footprint.
The LTC3210 charge pump features low-noise constant-frequency operation and automatically optimises efficiency based on input voltage and LED forward voltage conditions.
The device powers up in 1x mode and automatically switches to boost mode (1.5x) when any enabled LED current source approaches dropout; a subsequent dropout switches the part into 2x mode.
Maximum currents for the main and camera displays are set with two resistors, one per display.
LED currents are controlled with precision internal current sources, while dimming and on/off control for each display are achieved via a single-wire interface.
The LTC3210 has 64 brightness levels for the main display and eight levels for the camera output.
Internal circuitry prevents inrush current and excessive input noise during startup and mode switching; in addition the device has open/short LED protection.
The LTC3210EUD is available from stock in a low profile (0.75mm) 16-lead QFN (3 x 3mm) package.
Pricing starts at $1.70 each for 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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