Cellphone LED driver features 1A total output current & 95% efficiency
( 01 Nov 2005 )
Linear Technology’s LTC3208 is a fully integrated, 850kHz, low noise, high efficiency 1x/ 1.5x/2x charge pump multidisplay LED driver that can drive up to 17 LED current sources: a 1-4 LED main display, 1-2 LED sub display, a 1-3 LED RGB display, a 1-4 camera LED display, and a 1-4 LED auxiliary display from a compact 5_5mm QFN package. Each display has digital control with independent dimming and programming via a two-wire I2C serial interface. The LTC3208’s input voltage range of 2.9 to 4.5V is optimized for single cell Li-Ion cellular applications. Efficiencies when driven from a Li-Ion battery (3.6V nominal) reach 95% with quiescent current of only 250uA, maximizing battery run-time. The LTC3208 requires only four small capacitors and one resistor to create a tiny, low profile (<34mm2, 0.75mm high) solution footprint capable of powering all LEDs used in five separate displays.
Keithley Instruments
With more than 60 years of measurement expertise, Keithley Instruments has become a world leader in advanced electrical test instruments and systems from DC to RF (radio frequency). Our products solve emerging measurement needs in production testing, process monitoring, product development, and research...
