LTC3783 PWM LED Driver and Boost, Flyback and SEPIC Controller FEATURES DESCRIPTION TM n True Color PWM Delivers Constant Color with The LTC 3783 is a current mode LED driver and boost, 3000:1 Dimming Ratio flyback and SEPIC controller that drives both an N-channel n Fully Integrated Load FET Driver for PWM Dimming power MOSFET and an N-channel load PWM switch. When Control of High Power LEDs using an external load switch, the PWMIN input not only n 100:1 Dimming from Analog Inputs drives PWMOUT, but also enables controller GATE switch- n Wide FB Voltage Range: 0V to 1.23V ing and error amplifier operation, allowing the controller n Constant Current or Constant Voltage Regulation to store load current information while PWMIN is low. n Low Shutdown Current: I = 20A This feature (patent pending) provides extremely fast, Q n 1% 1.23V Internal Voltage Reference true PWM load switching with no transient overvoltage n 2% RUN Pin Threshold with 100mV Hysteresis or undervoltage issues LED dimming ratios of 3000:1 n Programmable Operating Frequency can be achieved digitally, avoiding the color shift normally (20kHz to 1MHz) with One External Resistor associated with LED current dimming. The FBP pin allows n Synchronizable to an External Clock Up to 1.3f analog dimming of load current, further increasing the OSC n Internal 7V Low Dropout Voltage Regulator effective dimming ratio by 100:1 over PWM alone. n Programmable Output Overvoltage Protection In applications where output load current must be returned n Programmable Soft-Start to V , optional constant current/constant voltage regula- IN TM n Can be Used in a No R Mode for V < 36V SENSE DS tion controls either output (or input) current or output n 16-Lead DFN and TSSOP Packages voltage and provides a limit for the other. I provides a LIM 10:1 analog dimming ratio. APPLICATIONS For low- to medium-power applications, No R mode SENSE n High Voltage LED Arrays can utilize the power MOSFETs on-resistance to eliminate n Telecom Power Supplies the current-sense resistor, thereby maximizing efficiency. n 42V Automotive Systems n 24V Industrial Controls The ICs operating frequency can be set with an external n IP Phone Power Supplies resistor over a 20kHz to 1MHz range and can be synchro- nized to an external clock using the SYNC pin. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. True Color PWM and No R are trademarks of Linear Technology Corporation. SENSE The LTC3783 is available in the 16-lead DFN and TSSOP All other trademarks are the property of their respective owners. packages. TYPICAL APPLICATION 350mA PWM LED Boost Application Typical Waveforms V IN 6V TO 16V 10F (< TOTAL V OF LEDs) F V 2.2H PWMIN 2 1M 5V/DIV ZETEX ZLLS1000 V OUT LTC3783 V <25V OUT 0.2V/DIV 237k RUN V IN AC COUPLED LED* PWMIN OV/FB STRING I PWMOUT TH I L SS I 2.5A/DIV LIM 105k C V GATE M1 M2 OUT REF 10F 0.1F FBP SENSE I FBN INTV LED 10F CC 4.7F 0.5A/DIV FREQ GND SYNC 10k 6k 0.05 12.4k 0.3 3783 TA01b 1s/DIV GND 3783 TA01a M1, M2: SILICONIX Si4470EY *LUMILEDS LHXL-BW02 3783fb 1LTC3783 (Note 1) ABSOLUTE MAXIMUM RATINGS V , SENSE, FBP, FBN Voltages ................. 0.3V to 42V Operating Temperature Range (Note 2) IN INTV Voltage ............................................ 0.3V to 9V LTC3783E ............................................. 40C to 85C CC INTV Output Current .......................................... 75mA LTC3783I............................................ 40C to 125C CC GATE Output Current ................................. 50mA (RMS) Junction Temperature (Note 3) ............ 40C to 125C PWMOUT Output Current .......................... 25mA (RMS) Storage Temperature Range V Ouput Current ................................................. 1mA DFN Package ..................................... 65C to 125C REF GATE, PWMOUT Voltages .......0.3V to (V + 0.3V) TSSOP Package ................................ 65C to 150C INTVCC I , I , SS Voltages ............................... 0.3V to 2.7V Lead Temperature (Soldering, 10sec) TH LIM RUN, SYNC, PWMIN Voltages..................... 0.3V to 7V TSSOP Package ............................................... 300C FREQ, V , OV/FB Voltages ..................... 0.3V to 1.5V REF PIN CONFIGURATION TOP VIEW TOP VIEW FBN 1 16 RUN FBN 1 16 RUN FBP 2 15 I FBP 2 15 I TH TH I 3 14 OV/FB I 3 14 OV/FB LIM LIM V 4 13 SS V 4 13 SS REF REF 17 17 FREQ 5 12 SENSE FREQ 5 12 SENSE SYNC 6 11 V SYNC 6 11 V IN IN PWMIN 7 10 INTV PWMIN 7 10 INTV CC CC PWMOUT 8 9 GATE PWMOUT 8 9 GATE FE PACKAGE DHD PACKAGE 16-LEAD PLASTIC TSSOP 16-LEAD (5mm 4mm) PLASTIC DFN T = 125C, = 38C/W T = 125C, = 43C/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 ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3783EDHD PBF LTC3783EDHD TRPBF 3783 16-Lead (5mm 4mm) Plastic DFN 40C to 85C LTC3783IDHD PBF LTC3783IDHD TRPBF 3783 16-Lead (5mm 4mm) Plastic DFN 40C to 125C LTC3783EFE PBF LTC3783EFE TRPBF 3783EFE 16-Lead Plastic TSSOP 40C to 85C LTC3783IFE PBF LTC3783IFE TRPBF 3783IFE 16-Lead Plastic TSSOP 40C to 125C LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3783EDHD LTC3783EDHD TR 3783 16-Lead (5mm 4mm) Plastic DFN 40C to 85C LTC3783IDHD LTC3783IDHD TR 3783 16-Lead (5mm 4mm) Plastic DFN 40C to 125C LTC3783EFE LTC3783EFE TR 3783IFE 16-Lead Plastic TSSOP 40C to 85C LTC3783IFE LTC3783IFE TR 3783IFE 16-Lead Plastic TSSOP 40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. 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