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Optoelectronics/Displays??

Power converter targets small-, medium-sized TFT LCDs

Posted: 26 Mar 2008 ?? ?Print Version ?Bookmark and Share

Keywords:TFT LCDs? power converter? LED drivers?

Linear Technology Corp. has announced the LTC3524, an integrated BIAS and white LED power converter solution for small- to medium-sized (3 inches to 7 inches) TFT LCD panels. The device operates from an input voltage range of 2.5-6V, enabling it to accommodate multicell alkaline/NiMH batteries as well as single-cell Li-ion.

Each low noise output of the TFT converter is fully adjustable, enabling it to power a wide array of LCD panels. The LTC3524 can generate up to 25mA at 6V for the AVDD channel, and up to 2mA at 20V and -20V for the respective VGH and VGL bias requirements with controlled power-up/power-down sequencing.

As the primary boost converter uses a synchronous rectification topology, the LTC3524 can deliver up to 90 percent efficiencies for the LCD biasing. The dual-channel LED driver can power up to 10 white LEDs (5 per channel) while its True Color PWM Dimming offers up to 200:1 dimming ratios. Each LED channel is independent and offers open-LED protection. Total quiescent current is 200?A, providing maximum battery life, and its 1.5MHz switching frequency, combined with its 4mm x 4mm QFN package, enables a tiny, low-profile footprint.

The LTC3524EUF is available from stock in a 4mm x 4mm QFN package. Pricing starts at $2.25 for 1,000-piece quantities.





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