Boost converter, 'industry’s smallest’

The LM3530, is part of National's PowerWise energy efficient product family and is said to drive up to 11 high current LEDs in series, illuminating larger displays in portable media devices such as smartphones. The LM3530 is offered in a 12-bump micro SMD package and measures 1.615 × 1.215 × 0.425 mm. It was designed to address the requirement for increased power as multimedia content in portable devices, fuels the trend towards larger displays and longer video playback. National says that the LM3530 current mode boost converter can supply up to 29.5mA of power to 11 white LEDs from a single cell Lithium-Ion battery. The programmability - via an I2C compatible interface - has been designed to enable users to adjust for lighting effects such as fading, external ambient conditions and lighting level, as well as brightness and image performance. Its programmable ambient light response, along with a separate pwm dimming input, are said to enable the backlight LED driver to determine lighting requirements and select between various dimming options, optimising the light output for the given conditions.