Linear launched dual high efficiency white LED driver LT3497

Linear launched a dual, full function, boost DC/DC converter LT3497, the device from the lithium ion battery input drive up to 12 white LED. Its high efficiency, fixed frequency operation to ensure uniform LED brightness and low noise and maximize battery life, the on-chip Schottky diode, so no external diode, which saves cost and space. True Color PWM dimming achieve up to 250:1 dimming range, while the LED does not change any color. The LT3497's two independent converters are capable of driving asymmetrical LED strings (up to 6 series LED) for each converter with an input voltage of 2.5V to 10V. The 3mm x 2mm DFN package and tiny external components can be composed of solution extremely compact footprint for handheld applications with limited space. 2.3MHz constant switching frequency LT3497 enables designers to minimize solution footprint and switching noise. The input voltage range of 2.5V to 10V allows the device to be used for handheld applications powered by a single or two Li ion battery and an application of the 5V fixed input power supply. High current detection allows the use of a single line driver for each LED string. LT3497 has a constant current source, is responsible for delivering the same current to each white LED, but not affected by the fluctuation of LED forward voltage drop (the pressure will change with temperature, manufacturing tolerances and aging), so as to ensure the uniformity of the brightness of LED. Although the two independent boost regulators can drive asymmetric LED strings on the same chip, each of the LED strings has independent dimming and shutdown control. Other features include internal soft start / inrush current limiting and LED open circuit protection. The solution LT3497 has high efficiency, versatility, low noise and small overall area, very suitable for backlighting applications in various shapes and sizes of tiny but need a lot of white LED. LT3497 by 3mm x 2mm DFN-10 package, off the shelf. In 1000 pieces for the bulk purchase, each price starts at $1.70. LT3497 3V 12 LED 6 LED LED LED "" LED 32V 2.3MHz 5% VIN 2.5V 10V 250:1 True Color PWM 1F 3mm x 2mm 10 DFN For details, please visit: www.linear.com.cn.

Source: China Power Grid