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Optoelectronics/Displays  

Linear Tech DC/DC converter powers white LEDs

Posted: 10 May 2006     Print Version  Bookmark and Share

Keywords:LTC3452  DC/DC converter  white LED  Linear Technology 

Linear Technology Corp. has announced the LTC3452, a synchronous buck-boost DC/DC converter designed for driving two banks of white LEDs from a single Li-Ion battery. Up to five parallel LEDs can be driven at up to 25mA each for backlighting LCD panels, while two LEDS can be driven at up to 200mA each (or one LED at 400mA) for camera flash applications.

The LTC3452's synchronous buck-boost topology delivers up to 90 per cent efficiency over the usable Li-Ion range of 2.7V to 4.2V. Housed in a 4-by-4mm DFN package, the product has a constant 1MHz switching frequency that is said to enable a compact solution footprint required in most handhelds.

The LTC3452 operates in synchronous buck, synchronous boost or buck-boost mode, depending on the input voltage and the maximum LED forward voltage drop. According to Linear, optimum efficiency is achieved by sensing which LED requires the largest forward voltage drop at its programmed current and regulating the common output rail for the lowest dropout. Maximum LED current for each display is programmable with a single external resistor. Dual enable pins allow for pulse-width modulation brightness control for the TFT display while an independent on/off control is used for the flash output. Other features include: internal soft start, open/shorted LED protection and over-temperature protection.

Pricing of the LTC3452 starts at Rs.81.20 ($1.80), each for 1,000-piece quantities.




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Related Datasheets
Part Number Description Category
LTC3452 Synchronous Buck-Boost MAIN/CAMERA White LED Driver ICs, Interface

 
 
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