Linear Technology Corporation announces the LTC3209-1 and LTC3209-2, highly integrated, 850 kHz, low noise, high efficiency 1x/1.5x/2x multimode charge pumps for driving main, camera and auxiliary LED displays in cellular phones. They can each drive up to eight LED current sources at up to 600 mA of total output current. The LTC3209-1 can drive up to six LED main displays, one LED camera displays and a one LED auxiliary display, whereas the LTC3209-2 can drive up to five LED main displays, two LED camera displays and a one LED auxiliary displays, all from a 4 × 4 mm QFN package. Each display has digital control with independent dimming and programming via a two-wire I2C™ serial interface. The LTC3209-1 and 2's input voltage ranges of 2.9 to 4.5 V have been optimized for single-cell Li-Ion cellular applications. Efficiencies when driven from a Li-Ion battery (3.6V nominal) reach 94% with quiescent current of only 400 uA, maximizing battery run-time. Both the LTC3209-1 and -2 require only four small capacitors and one resistor to create a low profile (< 25 mm2, 0.75 mm high) solution footprint.
Linear Technology Corporation
Linear Technology Corporation
1630 McCarthy Blvd.
Milpitas, CA, 95035
