LTC3210-2/LTC3210-3 MAIN/CAM LED Controllers with 32-Step Brightness Control in 3mm 3mm QFN Fae Tseru Dpircse Tnoi n Low Noise Charge Pump Provides High Efficiency The LTC 3210-2/LTC3210-3 are low noise charge pump with Automatic Mode Switching DC/DC converters designed to drive three or four MAIN n LEDs and one high current CAM LED for camera lighting. Multimode Operation: 1x, 1.5x, 2x n The LTC3210-2/LTC3210-3 require only four small ceramic Individual Full-Scale Current Set Resistors n capacitors and two current set resistors to form a complete Up to 500mA Total Output Current n LEDpower supply andcurrent controller. Single Wire EN/Brightness Control for MAIN and CAM LEDs Built-in soft-start circuitry prevents excessive inrush cur- n 32:1 Linear Brightness Control Range for rent during start-up and mode changes. High switching MAIN Display frequency enables the use of small external capacitors. n Three orFour 25mA Low DropoutMAIN LED Outputs Independent MAIN and CAM full-scale current settings n One400mA Low DropoutCAM LED Output are programmed by two external resistors. n LowNoise ConstantFrequency Operation* Shutdown mode and current output levels are selected n Low Shutdown Current:3A via two logic inputs. ENM and ENC are toggled to adjust n InternalSoft-Start Limits Inrush Current During the LEDcurrents via internal counters and DACs. A 5-bit Startup and ModeSwitching linear DAC (32 steps) provides high resolution brightness n Open/ShortLED Protection control for the MAINdisplay . n NoInductors The charge pump optimizes efficiency based on the volt- n 3mm 3mm 16-Lead Plastic QFN Package age across the LED current sources. The part powers up in 1x mode and will automatically switch to boost mode a acilpp Tsnoi whenever any enabled LED current source begins to n enter dropout. The LTC3210-2/LTC3210-3 are available Multi-LEDLight Supply for Cellphones/DSCs/PDAs ina 3mm 3mm 16-lead QFN package. L,L T, LTC, LTM, Linear Technology and the Linear logo are registered trademarksof Linear TechnologyCorporation. All other trademarks are the property of theirrespective owners. Protected by U.S. Patents including 6411531. T lacipy a acilpp Tn oi C2 C3 4-LED MAIN Display 2.2F 2.2F Efficiency vs V Voltage BAT 100 90 C1P C1M C2P C2M MAIN CAM 80 V V CPO BAT BAT C1 C4 70 2.2F 2.2F LTC3210-2 60 50 MLED1 40 MLED2 MLED3 30 ENM ENM MLED4 20 4 LEDs AT 9mA/LED ENC ENC (TYP V AT 9mA = 3V, NICHIA NSCW100) CLED F 10 321023 TA01 T = 25C A 0 RM RC GND 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 30.1k 24.3k V (V) BAT 321023 TA01b 1% 1% 321023fb EFFICIENCY (P /P ) (%) LED INLTC3210-2/LTC3210-3 a ulosb T e Mixa Mu M r a Tsgni (Note 1) V , CPO to GND ........................................0.3V to 6V I (Note 2)...................................................... 500mA BAT CLED ENM,E NC ...................................0.3Vt o (V + 0.3V) CPOS hort-CircuitD uration .............................. Indefinite BAT I ( Note2 ) ....................................................... 600mA Operating Temperature Range (Note 3) ...40C to 85C CPO I .................................................................35mA Storage TemperatureR ange ..................65Ct o 125C MLED1-4 p ni c no Farugi Tnoi TOP VIEW TOP VIEW 16 15 14 13 16 15 14 13 C1P 1 12 GND C1P 1 12 GND CPO 2 11 CLED CPO 2 11 CLED 17 17 ENM 3 10 ENC ENM 3 10 ENC MLED1 4 9 RC MLED1 4 9 RC 5 6 7 8 5 6 7 8 UD PACKAGE UD PACKAGE 16-LEAD (3mm s 3mm) PLASTIC QFN 16-LEAD (3mm s 3mm) PLASTIC QFN T =125C, = 68C/W T = 125C, =68C/W JMAX JA JMAX JA EXPOSED PAD(PIN 17) IS GND,MUST BE SOLDERED TO PCB EXPOSED PAD (PIN 17)IS GND, MUST BE SOLDERED TO PCB o r D re i n Fro Ma Tnoi LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3210EUD-2 PBF LTC3210EUD-2 TRPBF LCHX 40C to 85C 16-Lead (3mm 3mm) Plastic QFN LTC3210EUD-3 PBF LTC3210EUD-3 TRPBF LCHY 16-Lead (3mm 3mm)Plastic QFN 40Cto 85C Consult LTC Marketingfor parts specified with wideroperating temperature ra nges. Consult LTC Marketing forinformation onnon-standard lead based finish parts. For more information on lead freepart marking, go to: