Addressing the burgeoning market for energy-saving, environmentally friendly light-emitting diode (LED) technology, Freescale Semiconductor is now sampling the first LED backlight product in its power management IC portfolio. The new 10-channel MC34844 white LED driver IC is designed for LED backlights in notebook computers, as well as in flat-panel monitors with screen sizes ranging from 10 inches to 27 inches.
The IC is capable of driving up to 160 LEDs in 10 parallel strings. Its pulse-width modulation (PWM) generator supports LED dimming, a feature that helps improve picture quality and enables a long screen life. The device is also designed to deliver consistent performance over the lifetime of the LEDs by compensating for optical and temperature degradation.
Using the MC34844’s I²C/SMBus interface, developers can program the LED current, PWM frequency and PWM duty cycle for the LEDs. Multiple devices can be synchronised for driving more LEDs. The IC is engineered to remove the burden on the controller for PWM generation and to eliminate the need for PWM signals to travel through the printed circuit board, which can cause noise and electromagnetic compatibility performance issues.
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