LTC3208 High Current Software Con gurable Multidisplay LED Controller FEATURES DESCRIPTIO The LTC 3208 is a highly integrated multidisplay LED 1x/1.5x/2x Charge Pump Provides Up to 95% controller. The part contains a 1A high ef ciency, low noise Ef ciency charge pump to provide power to the MAIN, SUB, RGB, CAM Up to 1A Total Output Current and AUX LED displays. The LTC3208 requires only small 17 Current Sources Available as MAIN, SUB, RGB, ceramic capacitors and one current set resistor to form a CAM and AUX LED Drivers complete LED power supply and current controller. LED ON/OFF, Brightness Level and Display 2 Con guration Programmable Using 2-Wire I C The maximum display currents are set by a single ex- Interface ternal resistor. Current for each LED is controlled by a Low Noise Constant Frequency Operation with Flying precision internal current source. Dimming and On/Off Capacitor Edge Rate Control 2 for all displays is achieved via the I C serial interface. Automatic Charge Pump Mode Switching 256 brightness levels are available for the MAIN and SUB Internal Soft-Start Limits Inrush Current During displays. 16 levels are available for the RGB and CAM Startup and Mode Switching displays. Four AUX current sources can be independently Open/Shorted LED Protection 2 assigned via the I C port to the CAM, SUB, MAIN or AUX Short-Circuit/Thermal Protection DAC controlled displays. 256 Brightness States for MAIN and SUB Displays The LTC3208 charge pump optimizes ef ciency based 4096 Color Combinations for the RGB Display on the voltage across the LED current sources. The part 5mm 5mm 32-Lead QFN Plastic Package powers up in 1x mode and will automatically switch to U boost mode whenever any enabled LED current source APPLICATIO S begins to enter dropout. The rst dropout switches the Video/Camera Phones with QVGA + Displays part into 1.5x mode and a subsequent dropout switches , LTC and LT are registered trademarks of Linear Technology Corporation. All other the LTC3208 into 2x mode. The part is available in a small trademarks are the property of their respective owners. Protected by U.S. Patents including 5mm 5mm 32-lead QFN package. 6411531. TYPICAL APPLICATIO 4-LED MAIN Display C2 C3 Ef ciency vs Input Voltage 2.2 F 2.2 F 100 90 C1P C1M C2P C2M MAIN SUB CAMERA RGB AUX 80 V CPO 70 BAT V BAT1,2,3 C1 60 4.7 F C4 50 4.7 F LTC3208 40 4 MAIN1-4 30 2 2 SUB1-2 SCL/SDA I C 20 4 4 LEDs AT 15mA/LED CAM1-4 (TYP V AT 15mA = 3.2V) 10 F 3 RGB ENRGBS T = 25C ENABLE DISABLE A 4 0 AUX1-4 CAMHL LOW HI 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 3208 TA01a R GND REF V (V) BAT 24.3k 3208 TA01b 1% 3208fa 1 EFFICIENCY (P /P ) (%) LED IN U ULTC3208 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW V , DV , CPO to GND ................................ 0.3 to 6V BAT CC SDA, SCL, ENRGBS, CAMHL ..... 0.3V to (DV + 0.3V) CC 32 31 30 29 28 27 26 25 I (Note 2) ............................................................1.3A CPO CAM1 1 24 V BAT2 I , I (Note 3) .......................................33mA MAIN1-4 SUB1-2 CAM2 2 23 RED I , I , I (Note 3) .......................................33mA RED GRN BLUE CAM3 3 22 GRN I , I (Note 3) ......................................120mA CAM4 4 21 BLUE CAM1-4 AUX1-4 33 AUX1 5 20 SUB1 CPO, R Short-Circuit Duration .................... Inde nite REF AUX2 6 19 SUB2 Operating Temperature Range (Note 4) .. 40C to 85C AUX3 7 18 MAIN4 Storage Temperature Range .................. 65C to 125C AUX4 8 17 MAIN3 9 10 11 12 13 14 15 16 UH PACKAGE 32-LEAD (5mm 5mm) QFN EXPOSED PAD IS GND (PIN 33) MUST BE SOLDERED TO PCB T = 125C, = 34C/W JMAX JA ORDER PART NUMBER UH PART MARKING LTC3208EUH 3208 Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: