LTC3206 2 I C Multidisplay LED Controller FEATURES DESCRIPTIO Step-Up/Direct-Connect Fractional Charge Pump The LTC 3206 is a highly integrated multidisplay LED con- Provides Up to 92% Efficiency troller. The part contains a high efficiency, low noise frac- Up to 400mA Continuous Output Current tional step-up/direct-connect charge pump to provide Independent Current and Dimming Control for power for both main and sub white LED displays plus an 1-6 LED MAIN, 1-4 LED SUB and RGB LED Displays RGB color LED display. The LTC3206 requires only four 2 LED Currents Programmable Using 2-Wire I C small ceramic capacitors plus two resistors to form a Serial Interface complete 3-display LED power supply and current 1% LED Current Matching controller. Low Noise Constant Frequency Operation* Maximum currents for the main/sub displays and RGB Minimal Component Count display are set independently. Current for each LED is Automatic Soft-Start Limits Inrush Current controlled with an internal current source. Dimming and 16 Exponentially Spaced Dimming States Provides ON/OFF control for all displays is achieved via a 2-wire 128:1 Brightness Range for MAIN and SUB Displays serial interface. Two auxiliary LED pins can be individually Up to 4096 Color Combinations for RGB Display assigned to either the MAIN or SUB displays. 16 individual Low Operating Current: I = 180A VIN dimming states exist for both the MAIN and SUB displays. Tiny, Low Profile 24-Lead (4mm 4mm 0.75mm) Each of the RED, GREEN and BLUE LEDs have 16 dimming QFN Package states as well, resulting in up to 4096 color combinations. U The LTC3206 charge pump optimizes efficiency based on APPLICATIO S V and LED forward voltage conditions. The part powers IN Cellular Phones up in direct-connect mode and automatically switches to Wireless PDAs 1.5x step-up mode once any enabled LED current source Multidisplay Handheld Devices begins to enter dropout. Internal circuitry prevents inrush , LTC and LT are registered trademarks of Linear Technology Corporation. 2 current and excess input noise during start-up and mode I C is a trademark of Philips Electronics N.V. * U.S. Patent 6,411,531 switching. The LTC3206 is available in a 24-lead (4mm 4mm) QFN package. TYPICAL APPLICATIO 5-LED Main Display Efficiency 2.2F 2.2F vs Input Voltage 100 V IN MAIN DISPLAY SUB DISPLAY RGB ILLUMINATOR 90 2.7V TO V CPO IN 4.5V 2.2F 2.2F 80 LTC3206 70 60 RED GREEN BLUE 4 MAIN1-4 50 AUX 1 40 2 SUB1-2 30 AUX 2 20 FIVE LEDs AT 15mA/LED 2 3 2 I C SERIAL 3206 TA01a (TYP V AT 15mA = 3.2V) F SERIAL PORT RGB 10 INTERFACE T = 25C A I I RGB MS 0 3.3 3.6 3.0 3.9 4.2 INPUT VOLTAGE (V) 3206 TA01b 3206f 1 EFFICIENCY (P /P ) (%) LED IN U ULTC3206 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW ORDER PART V , DV , CPO to GND............................... 0.3V to 6V IN CC NUMBER SDA, SCL, ENRGB/S ................. 0.3V to (DV + 0.3V) CC 24 23 22 21 20 19 I (Continuous) (Note 4) ................................ 400mA SUB1 1 18 BLUE LTC3206EUF CPO SUB2 2 17 GREEN (Pulsed at 10% Duty Cycle) (Note 4)..................... 1A C2 3 16 RED 25 I I , I (Note 4) ..................... 100mA C1 4 15 V MAIN1-4, SUB1,2 AUX 1, 2 IN + C1 5 14 CPO (Pulsed at 10% Duty Cycle) (Note 4).............. 125mA + C2 6 13 SGND I (Note 4) ..................................... 100mA UF PART RED,GREEN,BLUE 7 8 9 10 11 12 (Pulsed at 10% Duty Cycle) (Note 4).............. 125mA MARKING I , I (Note 4) .................................................. 1mA MS RGB 3206 UF PACKAGE CPO Short-Circuit Duration ............................ Indefinite 24-LEAD (4mm 4mm) PLASTIC QFN T = 125C, = 37C/W, = 2C/W JMAX JA JC Operating Temperature Range (Note 2) .. 40C to 85C EXPOSED PAD IS PGND (PIN 25) Storage Temperature Range ................. 65C to 125C MUST BE SOLDERED TO PCB Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25C. V = 3.6V, DV = 3V unless otherwise noted. A IN CC SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Input Power Supply V Operating Voltage 2.7 4.5 V IN DV Operating Voltage 1.5 5.5 V CC V Operating Current I = I = I = 0A, Direct-Connect Mode 180 A IN CPO MS RGB I = I = I = 0A, 1.5x Step-Up Mode 3.9 mA CPO MS RGB DV Operating Current Serial Port Idle 1 A CC V Shutdown Current 7.3 10 A IN DV Shutdown Current 1 A CC White LED Current (MAIN1-MAIN4, SUB1, SUB2, AUX1, AUX2) I Servo Voltage 25A < I < 75A 0.585 0.6 0.615 V MS MS 0.582 0.6 0.618 V Full-Scale LED Current Ratio (I /I ) MAIN1-MAIN4, SUB1, SUB2, AUX1, AUX2, Voltage = 1V 368 400 432 mA/mA LED MS LED Dropout Voltage 1.5x Mode Switch Threshold, I = 20mA 80 mV LED LED Brightness Range 0.78 100 % LED Current Matching MAIN-MAIN, MAIN-AUX, SUB-SUB, SUB-AUX 1 % RGB LED Current (RED, GREEN, BLUE) I Servo Voltage 25A < I < 75A 0.585 0.6 0.615 V RGB RGB 0.582 0.6 0.618 V LED Current Ratio (I /I ) RED, GREEN, BLUE Voltage = 1V 360 400 440 mA/mA LED RGB RGB LED Dropout Voltage 1.5x Mode Switch Threshold, I = 20mA 80 mV LED RGB PWM (Duty Factor) Range 0/15 15/15 % Charge Pump (CPO) 1x Mode Output Impedance 0.68 1.5x Mode Output Impedance V = 3V, V = 4.2V (Note 3) 1.90 IN CPO 3206f 2 DV AUX2 CC SDA AUX1 SCL MAIN1 ENRGB/S MAIN2 I MAIN3 MS I MAIN4 RGB U WWW