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The LM3530 LED driver uses advanced ambient light sensing algorithms and control technology that adjusts the backlight according to the content of the film. It not only ensures clear and bright images, but also reduces power consumption. The actual power consumption is reduced by 55 compared to the normal backlight system. %. At the same time, the LM3530 current mode boost converter can provide up to 29.5mA drive current for 11 white LEDs with a single lithium battery. System designers can set up a variety of different functions through the I2C-compatible interface, such as fade-in and fade-out, external environment and light output, and brightness and image effects.
Another advantage of the LM3530 chip is that it can set the ambient light response time, and it also has independent PWM dimming input function. Therefore, this LED backlight driver can flexibly set the required backlight brightness according to the actual environment, and then make different adjustments. Light control to provide the most suitable light output for different situations. In addition, the chip ensures that there is no flicker when dimming through a logarithmic function and linear LED luminance mapping technology. The boost converter operates at a fixed 500kHz frequency, so efficiency is maintained at an extremely high level as long as the LED current does not exceed its specified range.
The LM3530 is available in a 12-pin micro SMD package measuring just 1.615mm x 1.215mm x 0.425mm. The large-screen display backlight system with series LED configuration can reduce system power consumption by using the LM3530 chip. As for the screen with parallel current, National Semiconductor will launch another product with similar functions in October 2009. 
National Semiconductor Introduces New White LED Driver to Reduce Screen Power Consumption by 55%
Topic: Technology National Semiconductor has introduced a new small white LED driver that flexibly controls the brightness of the screen backlight, PowerWise Series LM3530. The product's boost converter can drive up to 11 high-current LEDs in series to provide sufficient backlight power for the large screens of portable multimedia electronics such as smart phones.