The LTC3524 is an integrated BIAS and white LED power converter solution for small/medium-sized polysilicon thin film transistor (TFT) liquid crystal (LCD) display panels. The device operates from a single Lithium-Ion/polymer battery or any voltage source between 2.5V and 6V. A 1.5MHz synchronous boost converter generates a programmable low noise, high efficiency 25mA TFT supply of up to 6.0V. Regulated, low ripple charge pumps are used to generate up to +20V and –20V at 2mA. Output sequencing is internally controlled to insure proper initialization and rapid discharge of the LCD panel in shutdown. A second 1.5MHz boost converter powers one or two LED strings with up to five series elements each. LED current and display brightness can be controlled over a wide range using analog or digital means up to 25mA. The LTC3524 is offered in the 4mm × 4mm 24-pin QFN package, minimizing the total solution footprint. Applications * PDAs, Palmtop Computers * Digital Still and Video Cameras * Handheld GPS * Portable Instrument Displays * Portable Media Players * Generates Three Adjustable, Low Noise Rails for Small/Medium TFT Displays * Drives Up to Ten White LEDs * LED Dimming and Open-Circuit Protection * Controlled Power-Up/Power-Down Sequencing * 1.5MHz Fixed Frequency, Low Noise Operation * VIN Range 2.5V to 6V, VOUT Range 3V to 6V * TFT Supply Efficiency Up to 90% * LED Supply Efficiency Up to 78% * Two independently Enabled LED Strings * 200 to 1 True Color PWM™ Dimming * Tiny External Solution * 24-Lead QFN Package (4mm × 4mm × 0.75mm) https://elecena.pl/product/642707/adjustable-tft-bias-supply-with-wled-driver 2008-05-09 https://elecena.pl/product/642707/adjustable-tft-bias-supply-with-wled-driver 2014-06-11 https://elecena.pl/product/642707/adjustable-tft-bias-supply-with-wled-driver 2025-01-21