Friday 26 October 2007
Drivers
Hernan Alcerreca
National Semiconductor Corporation added three new power management products for driving light-emitting diodes (LEDs) and powering organic LED (OLED) displays to its PowerWise energy-efficient product family. National’s new products, the LM2755 LED driver, the LM2757 inductor-less switched capacitor boost regulator and the LM4510 high-voltage boost regulator are tiny system solutions that extend battery life and enable next-generation visual effects in portable media devices.
The LM2755, in a tiny, low-profile micro SMD package, enables multi-zone backlighting for three independent RGB (red-green-blue) or white indicator LEDs controlled by programmable pattern generators. Programmability, exponential dimming steps and an I2C compatible interface provide flexibility and customisation to fit various multimedia functions such as gaming and mobile television.
The LM2757, also in a micro SMD package, requires just four tiny ceramic capacitors for a total solution size of less than 12 mm squared. With high output current and pin-selectable output voltages, the LM2757 delivers a compelling inductor-less solution well-suited for peripheral lighting features, such as keypad lighting. The LM2757 can also be used to power USB On-The-Go (OTG) peripherals.
National’s LM4510 is a synchronous high-voltage boost regulator that supports OLED displays which are much thinner and consume less energy than liquid crystal displays (LCDs). The LM4510 features up to 85% efficiency for longer battery life and is offered in a small LLP package.
National Semiconductor
www.national.com
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