Analog & Mixed Signal Products HBLED Driver Selection DC/DC Buck DC/DC Boost AC/DC Flyback Graphical Selector Guide AC/DC Buck Constant Current IS31LT3916 External MosFET Integrated PFC Flyback Config IS31LT3938 Higher Drive MosFET Linear/PWM/Switch Dim <256VAC Over Temp/Cur/Volt Prot IS31LT3918 External MosFET Linear/PWM/Switch Dim Over Temp/Cur/Volt Prot IS31LT3910 External MosFET Linear/PWM Dimming Temp. Compensation IS31LT3948 External MosFET IS31LT3350 PFM/PWM Operation Integrated MosFET (750mA) OverTemp/Volt Protection VIN Linear/PWM Dimming IS31LT3352 Integrated MosFET (750mA) Linear/PWM Dimming Temp. Compensation IS31LT3360 IS31LT3505 IS32LT3117 Integrated MosFET (1.2A) Integrated MosFET (2.1A) Automotive Grade (pending) <40VDC 1Mhz Switching Thermal current regulation OverTemp Protection above 140°C IS31LT3380 Integrated MosFET (1.2A) Switch Dimming IS31LT3354 External MosFET Linear/PWM Dimming IS31LT3135 Integrated MosFET Main/Aux Dual Channel <6VDC DC/DC Buck AC/DC Buck DC/DC Boost Linear Driver Buck Converter A “buck” or “step-down” takes a higher input voltage and converts it to a lower output voltage. Boost Converter A “boost” or “step-up”takes a lower input voltage and converts it to a higher output voltage. Linear Driver A “linear driver” generates a fixed current that varies slightly with changes in voltage. 2 Feb. 2013 1940 Zanker Rd., San Jose, CA. 95112 • Tel: 408.969.6600 • Support: [email protected] • www.issi.com DC/DC Buck IS31LT3350 40V/750mA Integrated Switch, Continuous Mode Buck Converter Features • 750mA output current with 5% accuracy • 1MHz switching frequency with 95% efficiency • Integrated 40V power switch for decreased parts count • Single pin ON/OFF and brightness control using Linear or PWM • Typical 1200 : 1 dimming ratio • Open-circuit LED thermal shutdown protection • Supports electronic transformer input IS31LT3350 • Supports DMX512 control interface SOT23-5 SOT89-5 Demo Boards Available • Common MR16, GU10 Lamps • Voltage doubler MR16 project • 6 output RGB decorative light • 4 output common anode RGB decorative light Applications • MR16 LED spotlight • LED Streetlamp, wall-washer, decorative lighting • Automobile LED decorative lights MR16, GU10 Lamp Application Feb. 2013 1940 Zanker Rd., San Jose, CA. 95112 • Tel: 408.969.6600 • Support: [email protected] • www.issi.com 3 IS31LT3360 DC/DC Buck 40V/1.2A Integrated Switch, Continuous Mode Buck Converter Features • Up to 1.2A output current with 3% accuracy • 1MHz switching frequency with 98% efficiency • Integrated 40V power switch • Single pin on/off and brightness control using Linear or PWM • Typical 1200 : 1 dimming ratio • Open-circuit LED thermal shutdown protection • Supports electronic transformer input IS31LT3360 • Supports DMX512 control interface SOT89-5 Demo Boards Available • Common MR16, GU10 Lamps • Voltage doubler MR16 project • 6 output RGB decorative light • 4 output common anode RGB decorative Light Applications • MR16 LED spotlight • LED Streetlamp, wall-washer, decorative lighting • Automobile LED decorative lights MR16, GU10 Lamp Application 4 Feb. 2013 1940 Zanker Rd., San Jose, CA. 95112 • Tel: 408.969.6600 • Support: [email protected] • www.issi.com DC/DC Buck IS31LT3352 40V/750mA Buck LED Driver with Temperature Compensation 750mA Features • Temperature Compensation protects the LED from high temperature damage • Cascadable temperature compensation • Integrated 40V power MOS • Operating Voltage range: 6V to 40V (drive up to 10 LEDs) • Output current up to 750mA (drives 3W LEDs) • up to 1200:1 dimming ratio • 5% output current accuracy • Accepts either DC or PWM dimming input signal • Up to 1MHz operating frequency SOP-8 Demo Boards Available • MR16 with Temperature Compensated LED • Street Light Applications • MR16 LED Spotlight • Decorative LED lighting Output Current vs Temperature • Wall Washer Lighting 400 350 300 Adjustable Temperature 250 Breakpoint 200 Iout (mA) Adjustable 150 Slope 100 50 0 0 15 30 45 60 75 90 Temperature ⁰C Feb. 2013 1940 Zanker Rd., San Jose, CA. 95112 • Tel: 408.969.6600 • Support: [email protected] • www.issi.com 5 IS31LT3380 DC/DC Buck 40V/1.2A LED Driver with Switch Dimming Features • Up to 1.2A output current with 5% accuracy • 1MHz switching frequency with 98% efficiency • Integrated 40V power switch for decreased parts count • Multi-modes switch dimming • Use ordinary power switch with existing wiring and fixtures • Open-circuit LED thermal shutdown protection SOP-8 Demo Boards Available • MR16 with Multiple Power Output Levels • MR16 with Voltage Doubler • RGB Decorative Lighting with 6 outputs Supply Current (mA) Supply Current • 4 Channel, Common Anode RGB Decorative Lighting Applications • Low voltage halogen replacement LEDs (MR16) DIM1 DIM2 DIM LEVELS* • PAR LED bulb Floating Floating No Dimming • Low voltage industrial lighting, floodlamps Floating GND 100%-50%-20% • LED back-up lighting, wall washers GND Floating 100%-60%-30% GND GND 100%-30% *Switch ON/OFF cycles the DIM Ratio 6 Feb. 2013 1940 Zanker Rd., San Jose, CA. 95112 • Tel: 408.969.6600 • Support: [email protected] • www.issi.com DC/DC Buck IS31LT3354 40V/LED Driver with External Switch Features 2A • Up to 2A output current with 3% accuracy • Output current only limited by external com- ponent selection • 1MHz switching frequency with 98% efficiency • Typical 1200 : 1 dimming ratio • Open-circuit LED thermal shutdown protection • Single pin ON/OFF and brightness control using DC voltage or PWM SOT23-5 Demo Boards Available • High Power MR16 • High Current LED Lamp Applications • Low voltage halogen replacement LEDs (MR16) • PAR LED bulb • Low voltage industrial lighting, floodlamps • LED back-up lighting, wall washers Feb. 2013 1940 Zanker Rd., San Jose, CA. 95112 • Tel: 408.969.6600 • Support: [email protected] • www.issi.com 7 IS31LT3948 DC/DC Boost PFM Mode Boost LED Driver with External NMOS for High Power Applications Features • Wide input voltage range: 5V-100V • Constant Current Output limited only by exter- nal component selection (Note) • Automatically adjust boost output for constant Load current • No loop compensation required • Up to 1MHz Switching Frequency Efficiency up to 90% • Internal over-voltage protection • Internal over-temperature protection • Operating temperature range -40°C to 85°C SOP-8 Demo Boards Available • General Purpose Boost Demo Board Applications • Street Lighting • MR16 • LED back-up lighting, wall washers • TV Monitor Backlight • Notebook • Automotive Street Lamp Application 8 Feb. 2013 1940 Zanker Rd., San Jose, CA. 95112 • Tel: 408.969.6600 • Support: [email protected] • www.issi.com DC/DC Boost IS31LT3505 1.0Mhz Boost Converter with 35V Internal NMOS for Medium Power Applications 1A Features • 6V to 30V supply voltage • Boost output up to 35V • Output current up to 1A • PWM dimming control • 1MHz switching frequency with 90% efficiency • Integrated 35V power switch • Internal soft start • Open-circuit LED thermal shutdown protection MSOP-10 Demo Boards Available • General Purpose Boost Demo Board Applications • TV Monitor Backlight • PDA, Notebook • GPS Receiver Feb. 2013 1940 Zanker Rd., San Jose, CA. 95112 • Tel: 408.969.6600 • Support: [email protected] • www.issi.com 9 IS31LT3910 AC/DC Buck Universal High Brightness LED Driver with Temp Compensation Features • Up to 1A output current with 5% accuracy • 1MHz switching frequency with 90% efficiency • Temperature compensation to regulate LED current • Single pin on/off and brightness control using Linear or PWM • Typical 1200 : 1 dimming ratio • Open-circuit LED thermal shutdown protection • Non-isolated Design SOP-8 Output Current vs Temperature 400 350 Demo Boards Available 300 Adjustable • Single Voltage input, 220V, 24x12 LED (T8) Temperature 250 Breakpoint (EMI-passed) 200 • Full Voltage range input, 24x12 LED (T8) Iout (mA) 150 Adjustable Slope (EMI-passed) 100 50 0 0 15 30 45 60 75 90 Applications Temperature ⁰C • DC/DC or AC/DC constant current driver • RGB Backlight • Fluorescent Tube (T8/T5) replacement • Signal Lamp • Decorative Lighting 10 Feb. 2013 1940 Zanker Rd., San Jose, CA. 95112 • Tel: 408.969.6600 • Support: [email protected] • www.issi.com AC/DC Buck IS31LT3918 High Voltage LED Driver with Switch Dimming Features 1A • Wide input range from 6VDC to 450DC or 85VAC to 265VAC • 92% efficiency with 1% output current accuracy • Linear, PWM or switch dimming capability • Use ordinary power switch with existing wiring and fixtures • Over current, voltage and temp protection • Requires few external components • Non-isolated Design SOP-8 Demo Boards Available • Single Voltage input, 220V, 24x12 LED (T8) DIM1 DIM2 DIM LEVELS* (3-Power Levels) Floating Floating No Dimming • Full Voltage range input, 24x12 LED (T8) Floating GND 2 levels: 100%-30%-100% (3-Power Levels) GND Floating 2 levels: 100%-50%-100% • Full Voltage Range Input, Bulb Replacement GND GND 3 levels: 100%-50%-20%-100% (3-Power Levels) *Switch ON/OFF cycles the DIM Ratio Applications • DC/DC or AC/DC LED driver applications • General purpose constant current source • Signal and decorative LED lighting • Backlighting LED driver Feb. 2013 1940 Zanker Rd., San Jose, CA. 95112 • Tel: 408.969.6600 • Support: [email protected] • www.issi.com 11 IS31LT3938 AC/DC Buck High Voltage LED Driver with Three Level Power Sequencing Features • User configurable power sequencing levels • 3% output current accuracy • Over current, temperature protection and short circuit Protection • High efficiency (typical up to 95%) • Higher MOS drive