ON Semiconductor introduced the CAT3649, Quad-Mode LED Driver Fractional Charge Pump
ON Semiconductor introduced the CAT3649, a 6-channel, high efficiency Quad-Mode® LED driver for use in the latest smartphones and other consumer handheld applications such as digital still cameras and portable media players. The Quad-Mode® architecture coupled with Content Adaptive Brightness Control (CABC) ensures market leading efficiency in LED backlighting using only external capacitors.
Comparating with another devices on the market, the CAT3649 has a total of four charge pump modes (1x, 1.33x, 1.5x and 2x), rather than the customary three. The inclusion of a 1.33x mode increases its efficiency by up to 10 percent compared to traditional charge pump LED drivers using 1.5x operation. This allows the handheld products into which it is incorporated to greatly extend their battery life.
The CAT3649 Quad-Mode fractional charge pump supports a wide range of input voltages, from 2.4 volts (V) to 5.5 V. The LED current can be adjusted by analog dimming in 32 linear increments via the 1-wire interface. Further adjustment can be carried out through PWM. The PWM dimming control is compatible with CABC for PWM signal frequencies from 100 hertz (Hz) to 200 kilohertz (kHz).
This device is offered in a compact 3.0 mm x 3.0 mm and Pb-free TQFN-16 package. The price of the CAT3649 is $0.49 per unit in 100,000 unit quantities.
CAT3649 Quad-Mode LED Driver Fractional Charge Pump
(Photo from ON Semiconductor website)
More information about Quad-Mode LED driver can be found at ON Semiconductor Website