LTC3210 MAIN/CAM LED Controller in 3mm 3mm QFN Fserutae Dnoitpircse n Low Noise Charge Pump Provides High Efficiency The LTC 3210 is a low noise charge pump DC/DC converter with Automatic Mode Switching designed to drive four MAIN LEDs and one high current CAM LED for camera lighting. The LTC3210 requires only n Multimode Operation: 1x, 1.5x, 2x four small ceramic capacitors and two current set resis- n Individual Full-Scale Current Set Resistors tors to form a complete LED power supply and current n Up to 500mA Total Output Current controller. n Single Wire EN/Brightness Control for MAIN and CAM LEDs (8 Brightness Steps) Built-in soft-start circuitry prevents excessive inrush cur- n 64:1 Brightness Control Range for MAIN Display rent during start-up and mode changes. High switching n Four 25mA Low Dropout MAIN LED Outputs frequency enables the use of small external capacitors. n One 400mA Low Dropout CAM LED Output Independent MAIN and CAM full-scale current settings n Low Noise Constant Frequency Operation* are programmed by two external resistors. Shutdown n Low Shutdown Current: 3A mode and current output levels are selected via two logic n Internal Soft-Start Limits Inrush Current During inputs. Startup and Mode Switching The full-scale current through the LEDs is programmed n Open/Short LED Protection via external resistors. ENM and ENC are toggled to adjust n No Inductors the LED currents via internal counters and DACs. The n 3mm 3mm 16-Lead Plastic QFN Package part is shut down when both ENM and ENC are low for 150s (typ). a pp snoitacil The charge pump optimizes efficiency based on the volt- age across the LED current sources. The part powers up n Multi-LED Light Supply for Cellphones/DSCs/PDAs in 1x mode and will automatically switch to boost mode L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. whenever any enabled LED current source begins to en- *Protected by U.S. Patents including 6411531. ter dropout. The LTC3210 is available in a 3mm 3mm 16-lead QFN package. t lacipy a n oitacilpp 4-LED MAIN Display Efficiency vs V Voltage C2 C3 BAT 2.2F 2.2F 100 90 C1P C1M C2P C2M 80 MAIN CAM CPO 70 V V BAT BAT C1 C4 60 2.2F 2.2F LTC3210 50 MLED1 40 MLED2 MLED3 30 ENM ENM MLED4 20 4 LEDs AT 9mA/LED ENC ENC CLED 3210 TA01 (TYP V AT 9mA = 3V, NICHIA NSCW100) F 10 T = 25C A RM RC GND 0 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 30.1k 24.3k V (V) 1% 1% BAT 3210 TA01b 3210fb EFFICIENCY (P /P ) (%) LED INLTC3210 a etulosb m mumixa r sgnita p ni c no Fnoitarugi (Note 1) TOP VIEW V , CPO to GND ........................................0.3V to 6V BAT ENM, ENC ...................................0.3V to (V + 0.3V) BAT 16 15 14 13 I (Note 2) ....................................................... 600mA CPO C1P 1 12 GND I .................................................................30mA MLED1-4 CPO 2 11 CLED I (Note 2)...................................................... 450mA CLED 17 ENM 3 10 ENC CPO Short-Circuit Duration .............................. Indefinite MLED1 4 9 RC Operating Temperature Range (Note 3) ...40C to 85C 5 6 7 8 Storage Temperature Range ..................65C to 125C UD PACKAGE 16-LEAD (3mm s 3mm) PLASTIC QFN T = 125C, = 68C/W JMAX JA EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB o r D re i n Fnoitamro LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3210EUD PBF LTC3210EUD TRPBF LBXH 40C to 85C 16-Lead (3mm 3mm) Plastic QFN Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: