Nov 25 2010
Provider of high-performance silicon solutions, ON Semiconductor has unveiled the CAT3649 Quad-Mode LED driver for handheld applications such as portable media players and digital still cameras and smartphones.
The Quad-Mode architecture, when combined with Content Adaptive Brightness Control (CABC), assures high-efficiency in LED backlighting applications utilizing external capacitors.
The CAT3649 features four charge pump modes (2x, 1.5x, 1.33x, and 1x), instead of three modes present in conventional LED drivers. The 1.33x mode enhances the efficiency by a maximum of 10% when compared to conventiosnal LED drivers that use 1.5x operation. This enables the handheld devices, integrated with the LED driver, to expand the battery life substantially.
The Quad-Mode charge pump supports various input voltages, ranging from 2.4 to 5.5 V. The LED current can be altered in 32 increments by analog dimming through the 1-wire interface. Additional alteration can be conducted through the PWM dimming control, which is compatible with CABC.
ON’s Director of LED Power Products, Anthony Russell stated that the CAT3649 stands out in the industry because of its combination of filtering and CABC capabilities, PWM dimming, and high-efficiency.