VOL 2 Power Management for LEDs High Performance Analog ICs 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 2 10/24/08 3:43:50 PM LEDs and LED Driver Technology LEDs A light-emitting diode (LED) is a semiconductor device that emits narrow-spectrum incoherent light when forward-biased. The color of the emitted light depends on the chemical composition of the semiconductor material used, and can be near-ultraviolet, visible or infrared. LEDs are more prevalent today than ever before, replacing traditional incandescent and fluorescent bulbs in many lighting applications. Incandescents use a heated filament, are subject to breakage and burnout and operate at a luminous efficiency of 2% to 4%. Fluorescents are more efficient, at 7% to 12%, but require high drive voltage and contain mercury, a toxic substance that may be eventually banned in certain countries. LEDs, however, produce light directly through electroluminescence, operate at low voltage and can deliver over 20% luminous efficiency. Key Advantages of LEDs and Their Operation Versus Alternative Lighting Sources . High energy efficiency: LEDs are 7x to 10x more efficient at producing light (lumens) than incandescent bulbs . Extremely long life span: Typically 100,000 hours for LEDs versus 1,000 hours for incandescent bulbs and 10,000 hours for fluorescent bulbs . Solid state reliability . Nearly indestructible, solid epoxy lens cases – insensitive to vibration and shocks . Fast “turn-on” time – light up very quickly . Compact size . Capable of emitting light of an intended color without the use of color filters . Focused light output – incandescent and fluorescent sources often require an external reflector to collect light and direct it in a useable manner . Gradual reduction of light output over time, rather than sudden burn-out of incandescent bulbs LEDs deliver high efficiency, a key advantage in lighting systems. Incandescent bulbs generate significant heat as part of the light-production process. This is inefficient energy use since over 95% of the energy is not converted into visible light. On the other hand, LEDs convert a much higher percentage of electrical power into light output, substantially reducing power consumption. Key advancements in LED reliability have enabled lifetimes in excess of 100,000 hours. Recently, these have included alternative semiconductor doping techniques, new optical lens technologies and advanced heat sink and packaging techniques. Many developments are underway that will increase efficiency and lifetime even further, including improved case/housing designs, further improvements in light conversion efficiency and more thermally efficient packages for higher current operation. LED Driver Technology LED driver circuits are available in several topologies: . Inductor-based Buck, Boost, Buck-Boost and SEPIC designs (these generally drive LEDs in series or multiple strings of LEDs in series): . LED currents range from a few milliamps to multiple amps . Efficiencies in excess of 90% . Drivers act as constant current sources . Many devices use high side current sense: LED string can be returned to ground 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 3 10/24/08 3:43:51 PM . Inductorless charge pump-based Buck, Boost, Buck-Boost designs (these generally drive a single LED or LED strings in parallel): . LED currents range from a few milliamps to 1A . Average efficiencies over the Li-Ion battery range in excess of 80% . Drivers act as constant current sources . Very small solution footprints – ideal for handheld devices Deciding which IC and topology to use depends on the following factors: . The required LED current . The relation of LED(s) forward voltage to the input voltage range: Buck, Boost, Buck-Boost, SEPIC or Flyback . Efficiency – crucial for driving high brightness (HB) LEDs while minimizing thermal and battery life constraints . Current consumption required during off-time . Dimming characteristics – PWM dimming preserves chromatic characteristics across brightness levels and avoids color shifting . Number of LEDs / serial or parallel . Total solution size and cost constraints ICs specifically designed as LED drivers tend to be smaller in size compared to general-purpose alternative solutions, increasing their appeal in space-constrained portable power applications. Popular switchmode LED driver configurations include Buck, Boost, Buck-Boost and SEPIC, and can deliver current from 3mA/LED to 3A/LED or more. Choosing the best LED driver or display bias power IC depends on many factors and tradeoffs. Linear Technology provides targeted solutions for most applications. Key LED Applications for Semiconductor ICs . Automotive Lighting – Interior and Exterior . Portable Electronic Devices . LCD and CCD Panel Backlights . Signaling . Signs and Illumination . Photo Sensors . Commercial Lighting . Residential Lighting LED Driver Solutions Overview Linear Technology offers a broad line of LED drivers including both inductor-based (for LEDs in series) and inductorless (for LEDs in parallel) converters. These are offered in several different topologies, providing the highest efficiency, lowest noise and smallest footprints. Other features include integrated Schottky diodes, accurate LED current matching, a variety of dimming options and multiple output capability. This selection guide features Linear Technology solutions for a wide variety of LED driver applications. For more information on our latest products, visit our website at www.linear.com. 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 4 10/24/08 3:43:51 PM page 03 04 05 06 07 08 High Current LED Driver ICs (>350mA) Switching Regulator-Based (Inductor), LEDs in Series Buck Boost Buck-Boost SEPIC-Flyback Photoflash/Camera Torch Charge Pump-Based (Inductorless), LEDs in Parallel Single Output – Camera Flash/Torch Medium Current LED Driver ICs (100-350mA) 09 10 11 12 Switching Regulator-Based (Inductor), LEDs in Series Buck Boost Buck-Boost Multidisplay Low Current LED Driver ICs (20mA to 90mA) 12 13 14 17 18 15 –16 Switching Regulator-Based (Inductor), LEDs in Series Multidisplay Buck for Large Panel TFT LCDs Boost Charge Pump-Based (Inductorless), LEDs in Parallel Multidisplay General Purpose Multichannel LED Drivers for Large LCD Panels (30mA to 50mA) OLED 19 Switching Regulator Based (Inductor) LCD & CCD Bias 20 Switching Regulator Based (Inductor) Series LED Driver ICs 03–07 09–16 19 –20 VIN 8V TO 40V L1 22µH C1 4.7µF 1M D1 187k SHDN/UVLO FB VREF ISP 16.9k C2 4.7µF 1M VIN 23.7k LT3755 0.1Ω 1A CTRL INTVCC 100k ISN 100k NTC RT1 M1 GATE SENSE OPENLED PWM SS RT VC 0.01µF 28.7k 400kHz 0.015Ω 50W LED STRING PWMOUT GND INTVCC 10k 4.7µF 0.001µF M2 Parallel LED Driver ICs 08 17–18 2.2µF 2.2µF C1P C1M C2P C2M VIN CPO LTC3220 2.2µF LTC3220-1 VIN DVCC DVCC ULED1-18 0.1µF I2C RESET 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 5 SCL/SDA RST RGB1 RGB2 RGB3 RGB4 MAIN 4.7µF 18 GND 10/24/08 3:43:51 PM HIGH CURRENT (350mA TO 10A) LED DRIVERS – BUCK 03 High Current (350mA to 10A) LED Drivers – Buck High-current inductor-based step-down switching LED drivers provide tiny, efficient high power LED lighting solutions for automotive, architectural and display backlighting. Key features include wide-ranging True Color PWM™ dimming, wide input voltage range, high side sensing and high switching frequency. Applications: . Automotive and Avionic Lighting . Architectural Detail Lighting . Display Backlighting . Constant Current Sources LT3756: 100V High Voltage Full Featured LED Driver LT3756: Actual Size, Complete Solution Buck Mode 1A LED Driver with High Dimming Ratio and Open LED Reporting C1 1µF 1M VIN 365k ISP SHDN/UVLO 1.5k 6.19k VREF 0.17 1A + 22V – Efficiency vs VIN ISN FB CTRL M2 PWMOUT 5 WHITE LEDs 20W 1k LT3756 INTVCC L1 100µH 100k 28.7k 400kHz GATE RT VC SENSE GND INTVCC 96 D1 OPENLED SS 100 22.1k M3 PWM 0.1µF C3 4.7µF 100k EFFICIENCY (%) VIN 24V TO 80V VIN C4 4.7µF M1 88 0.0437 84 C2 4.7µF 47k 92 0.001µF 80 20 Part Number Topology Dimming Type Max # of LEDs x ILED from 24VIN LED Configuration Input Voltage Range (V) Max. Output Voltage (V) 30 40 60 50 VIN (V) 70 80 ISW (A) Operating Efficiency (%) Package High Current (350mA to 10A) LED Drivers - Buck LT3474/-1 Buck 400:1 PWM 4 x 1A Series 3 to 30 (40VMAX) 15/25 1.5 88 TSSOP-16E LT3592 Buck 10:1 Analog 4 x 500mA Series 4 to 36 30 0.8 88 2x2 DFN-10 MSOP-10E LT3517 Buck 5000:1 PWM 5 x 1A Series 3 to 30 (40VMAX) 40 1.5 92 4x4 QFN-16 TSSOP-16E LT3518 Buck 5000:1 PWM 5 x 1.5A Series 3 to 30 (40VMAX) 40 2.3 92 4x4 QFN-16 TSSOP-16E LT3496 Triple Buck 3000:1 PWM 3 x 5 x 0.5A 3 x Series Strings 3 to 30 (40VMAX) 40 3 x 0.75 92 4x5 QFN-28 LT3475/-1 Dual Buck 3000:1 PWM 2 x 4 x 1.5A 2 x Series Strings 4 to 36 15/25 2 x 1.5 88 TSSOP-20/E LT3478/-1 Buck 3000:1 PWM 5 x 1.5A Series 2.7 to 36 30 4.5 92 TSSOP-16E LT3476 Quad Buck 1000:1 PWM 4 x 5 x 1A 4 x Series Strings 2.8 to 36 30 4 x 1.5 96 5x7 QFN-38 LTC3783 Buck 3000:1 PWM 5 x 1A + Series 3 to 36 36 Ext FET 95 4x5 DFN-16 TSSOP-16 LT3755/-1 Buck 3000:1 PWM 5 x 1A + Series 4.5 to 40 75 Ext FET 96 3x3 QFN-16 MSOP-16E LT3756 Buck 3000:1 PWM 5 x 1A + Series 6 to 100 100 Ext FET 96 3x3 QFN-16 MSOP-16E 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 6 10/24/08 3:43:51 PM 04 02 HIGH CURRENT (350mA TO 10A) LED DRIVERS – BOOST High Current (350mA to 10A) LED Drivers – Boost Applications: High current inductor-based step-up switching LED drivers provide compact, efficient high power LED lighting solutions for automotive, architectural and display backlighting. Key features include wide-ranging True Color PWM dimming, wide input voltage range, high side sensing and high switching frequency. . Automotive and Avionic Lighting . Architectural Detail Lighting . Display Backlighting . Constant Current Sources LT3755: Boost Demo Circuit. Actual Size, Complete Solution LT3755: 75V High Voltage Full Featured LED Driver 50W White LED Headlamp Driver VIN 8V TO 40V L1 22µH C1 4.7µF 1M D1 187k SHDN/UVLO FB VREF ISP Efficiency vs Load 23.7k LT3755 16.9k C2 4.7µF 1M VIN 0.17 1A 100 CTRL INTVCC 100k VIN = 12V ISN 100k NTC RT1 M1 GATE 96 SENSE 0.01µF 28.7k 400kHz 0.0157 50W LED STRING PWMOUT GND INTVCC 10k EFFICIENCY (%) OPENLED PWM SS RT VC 92 88 4.7µF 0.001µF 84 M2 80 0.0 Part Number Topology Dimming Type Max # of LEDs x ILED from 12VIN LED Configuration Input Voltage Range (V) Max. Output Voltage (V) 0.2 0.4 0.6 LOAD (A) 0.8 1.0 ISW (A)* Operating Efficiency (%) Package High Current (350mA to 10A) LED Drivers – Boost LT3486 Dual Boost 1000:1 PWM 2 x 5 x 350mA 2x Series Strings 2.7 to 24 35 2 x 1.3 85 3x5 DFN-16 LT3517 Boost 5000:1 PWM 8 x 350mA Series 3 to 30 (40VMAX) 45 1.5 87 4x4 QFN-16 TSSOP-16E LT1618 Boost Analog/PWM 6 x 350mA Series 1.6 to 18 36 1.5 85 3x3 DFN-10 MSOP-10 LT3518 Boost 5000:1 PWM 11 x 350mA Series 3 to 30 (40VMAX) 45 2.3 87 4x4 QFN-16 TSSOP-16E LT3496 Triple Boost 3000:1 PWM 3 x 4 x 350mA 3 x Series Strings 3 to 30 (40VMAX) 45 3 x 0.75 87 4x5 QFN-28 LT3478/-1 Boost 3000:1 PWM 10 x 700mA Series 2.7 to 36 40 4.5 87 TSSOP-16E LT3476 Quad Boost 1000:1 PWM 4 x 8 x 350mA 4 x Series Strings 2.8 to 16 36 4 x 1.5 87 5x7 QFN-38 LTC3783 Boost 3000:1 PWM 10:1 Analog 10 x 1A Series 3 to 36+ 36 Ext FET 93 4x5 DFN-16 TSSOP-16 LT3755/-1 Boost 3000:1 PWM 15 x 1A Series 4.5 to 40 75 Ext FET 93 3x3 QFN-16 MSOP-16E LT3756 Boost 3000:1 PWM 25 x 0.5A Series 6 to 100 100 Ext FET 93 3x3 QFN-16 MSOP-16E * IOUT ~ 0.65 ISW x (VIN / VOUT). Estimate: may vary depending on external component selection. 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 7 10/24/08 3:43:54 PM HIGH CURRENT (350mA TO 10A) LED DRIVERS – BUCK-BOOST 05 03 High Current (350mA to 10A) LED Drivers – Buck-Boost Applications: High current inductor-based buck-boost switching LED drivers provide flexible, tiny, efficient solutions for TFT backlighting, automotive and avionic lighting applications. Key features include high current, high voltage switches, adjustable LED currents, wide input voltage range, and high switching frequency. . RGGB Lighting . Automotive and Avionic Lighting . TFT LCD Backlighting . Constant-Current Sources LT3476: High Current Quad Output LED Driver LT3476: Actual Size, Complete Solution 5V to 25V Step-Up/Step-Down Driver for 2 Series 350 mA LEDs PVIN 5V TO 25V 350mA 350mA 350mA 10µH 10µH LED1 10µH 10µH LED2 LED3 CAP2 CAP1 2.2µF PWM1-4 SHDN 2.2µF LED4 300m7 300m7 300m7 VIN 2.8V TO 16V 350mA 300m7 CAP3 2.2µF SW1 CAP1-4 LED1-4 VIN PWM1-4 SHDN CAP4 2.2µF SW2 SW3 LT3476 GND 1000:1 PWM Dimming at 100Hz 2.2µF SW4 REF VADJ1-4 PWM 5V/DIV 1.05V VC1-4 RT 47k 47nF ILED 500mA/ DIV 5µs/DIV Part Number Topology Dimming Type Max # of LEDs x ILED from 12VIN LED Configuration Input Voltage Range (V) Max. Output Voltage (V) ISW (A) Operating Efficiency (%) Package High Current (350mA to 10A) LED Drivers – Buck-Boost LT3517 Buck-Boost 5000:1 PWM 6 x 350mA Series 3 to 30 (40VMAX) 45 1.5 80 4x4 QFN-16 TSSOP-16E LT3518 Buck-Boost 5000:1 PWM 6 x 500mA Series 3 to 30 (40VMAX) 45 2.3 80 4x4 QFN-16 TSSOP-16E LT3496 Triple Buck-Boost 3000:1 PWM 3 x 350mA Series 3 to 30 (40VMAX) 45 3 x 0.75 80 4x5 QFN-28 LT3478/-1 Buck-Boost 3000:1 PWM 5 x 700mA Series 2.7 to 36 40 4.5 80 TSSOP-16E LT3476 Quad Buck-Boost 1000:1 PWM 4x5x 350mA 4 x Series Strings 2.8 to 16 36 4 x 1.5 80 5x7 QFN-38 LTC3783 Buck-Boost 3000:1 PWM 10:1 Analog 6 x 1A Series 3 to 36+ 36 Ext FET 85 4x5 DFN-16 TSSOP-16 LT3755/-1 Buck-Boost 3000:1 PWM 10 x 1A Series 4.5 to 40 75 Ext FET 85 3x3 QFN-16 MSOP-16E LT3756 Buck-Boost 3000:1 PWM 15 x 1A Series 6 to 100 100 Ext FET 85 3x3 QFN-16 MSOP-16E 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 8 10/24/08 3:43:54 PM 06 02 H I G H C U R R E N T ( 3 5 0 m A T O 1 0 A ) L E D D R I V E R S – S E P I C A N D F LY B A C K High Current (350mA to 10A) LED Drivers – SEPIC and Flyback High current inductor-based multitopology switching LED drivers provide flexible solutions for high voltage LED arrays. Key features include high current, wide input voltage range, scaleable output voltage, and wide-ranging True Color dimming. Applications: . High Power LED Applications . Industrial . Automotive LT3755: SEPIC Demo Circuit. Actual Size, Complete Solution LT3755: 75V High Voltage Full Featured LED Driver 20W SEPIC LED Driver VIN 8V TO 40V C4 1µF 100V L1A 22µH C1 4.7µF 50V 1M VIN C3 4.7µF 50V 511k SHDN/UVLO FB SEPIC Efficiency vs VIN L1B VREF 187k D1 5A 100V 25k 100 VOUT = 18V ILED = 1A LT3755 ISP CTRL INTVCC 0.17 100k 1A 95 M1 GATE OPENLED PWM SENSE SS RT PWMOUT VC GND INTVCC 0.01µF 28.7k 400kHz 30k EFFICIENCY (%) ISN 20W LED STRING 0.0157 90 85 C2 4.7µF 10V 0.001µF M2 80 0 Part Number Topology Dimming Type Max # of LEDs x ILED from 12 VIN LED Configuration 10 20 VIN (V) Input Voltage Range (V) Max. Output Voltage (V) ISW (A) Operating Efficiency (%) 40 30 Package High Current (350mA to 10A) LED Drivers – SEPIC and Flyback LT3517 SEPIC/FlyBack 5000:1 PWM 4 x 350mA Series 3 to 30 (40VMAX) 45* 1.5 80 4x4 QFN-16 TSSOP-16E LT3518 SEPIC/FlyBack 5000:1 PWM 6 x 350mA Series 3 to 30 (40VMAX) 45* 2.3 80 4x4 QFN-16 TSSOP-16E LT3478/-1 SEPIC/FlyBack 3000:1 PWM 6 x 500mA Series 2.7 to 36 40* 4.5 80 TSSOP-16E LT3476 Quad SEPIC/ FlyBack 1000:1 PWM 4x3x 350mA 4 x Series Strings 2.8 to 16 36* 4 x 1.5 80 5x7 QFN-38 LTC3783 SEPIC/FlyBack 3000:1 PWM 10:1 Analog 6 x 1A Series 3 to 36+ Limited by ext. FET Ext FET 85 4x5 DFN-16 TSSOP-16 LT3755/-1 SEPIC/FlyBack 3000:1 PWM 6 x 1A Series 4.5 to 40 75 Ext FET 85 3x3 QFN-16 MSOP-16E LT3756 SEPIC/FlyBack 3000:1 PWM 8 x 1A Series 6 to 100 100 Ext FET 90 3x3 QFN-16 MSOP-16E * VIN + VOUT 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 9 10/24/08 3:43:56 PM MEDIUM TO HIGH CURRENT (100mA TO 2A) LED DRIVERS FOR PHOTOFLASH/TORCH LIGHTING 07 03 Medium to High Current (100mA to 1A) LED Drivers for Photoflash/Torch Lighting LED Power Efficiency vs VIN High current inductor-based switching LED drivers for camera photoflash, torch and video lighting feature various topologies including buck-boost and boost and provide tiny, efficient high power solutions for camera phone applications. 100 ILED = 150mA 95 90 EFFICIENCY (%) Applications: . Cell Phone Camera Flash . Cell Phone Torch Lighting . Digital Cameras . PDAs . Miscellaneous Li-Ion/Polymer-Based LED Driver Applications 85 ILED = 1A 80 75 70 65 TA = 25°C EFFICIENCY = (VOUT – VLED)ILED/VINIIN 60 2.7 3.1 3.5 3.9 4.3 4.7 VIN (V) 5.1 5.5 LTC3454: 1A Synchronous Buck-Boost High Current LED Driver VIN 1-CELL Li-ion 2.7V - 4.2V L1 5μH 10μF 10μF VIN SW1 SW2 ILED LTC3454: Actual Size, Complete Solution VOUT LED EN2 0 0 1 1 LED LTC3454 EN1 (TORCH) EN1 0 1 0 1 ILED 0 (SHUTDOWN) 150mA 850mA 1A EN2 (FLASH) VC 0.1μF Part Number ISET1 ISET2 GND (EXPOSED PAD) Topology VIN (V) VOUT (V)* Max. Total LED Current (mA)* RISET2 3.65k 1% RISET1 20.5k 1% Max. No. of White LEDs Dimming Control Frequency (MHz) IQ (mA) ISD (µA) Package Medium to High Current (100mA to 1A) LED Drivers for PhotoFlash/Torch Lighting LTC3452 Buck-Boost 2.7 to 5.5 4.5 200 4 DC/PWM 1 0.6 <1 4x4 QFN-20 LTC3490 Boost 1.0 to 3.2 4 350 1 DC/PWM 1.3 1 <50 3x3 DFN-8 SO-8 LTC3453 Buck-Boost 2.7 to 5.5 4.5 500 1 DC/PWM 1 2.5 <6 4x4 QFN-16 LT1618 Buck-Boost 1.6 to 18 34 500 1 DC/PWM 1.4 1.8 <1 MSOP-10 LTC3454 Buck-Boost 2.7 to 5.5 5.15 1A 1 DC/PWM 1 0.8 <1 3x3 DFN-10 * Output voltage and current depend on the choice of external components 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 10 10/24/08 3:43:57 PM 08 02 HIGH CURRENT LED DRIVERS FOR CAMERA FLASH/TORCH – INDUCTORLESS High Current LED Drivers for Camera Flash/Torch – Inductorless Our family of inductorless charge pump-based camera LED driver products offers high efficiency and low ripple and can be used to boost an input voltage to drive high current LEDs for camera torch (continuous) and flash applications. By eliminating the inductor, these switched capacitor converters provide a small solution footprint and a simple design. Applications: . LED Camera Light Supply for Cellphones/DSCs/PDAs Efficiency vs VIN LTC3218: 400mA Single Wire Camera LED Charge Pump 100 2.2μF 2.9V TO 4.5V DISABLED ENABLED ENABLED CPO 4.7μF LTC3218 80 70 60 ILED ENF GND ENT ISETF 50mA 150mA 300mA 50 LED AOT2015 40 2.9 ISETT 3.1 3.3 ENT 0 0 0 (SHUTDOWN) 0 1 100mA (TORCH) 1 0 290mA 1 1 390mA (FLASH) VIN (V) 3.7 3.5 ILED ENF Part Number CM VIN 2.2μF DISABLED EFFICIENCY (%) CP 90 3.9 4.1 4.3 4.5 VIN (V) 10.2k 1% LTC3218: Actual Size, Complete Solution Conversion Total LED Ratio/Boost Current Factor (mA) Maximum Max. # of Operating White LEDs Efficiency** x ILED Dimming Control (%) Frequency (MHz) IQ (mA) ISD (µA) Package High Current (350mA to 1A) LED Drivers for Camera Flash - Inductorless LTC3218 2.9 to 4.5 1x/2x 400 1 x 400mA* Resistor/PWM 92 1 0.98 <1 2x3 DFN-10 LTC3214 2.9 to 4.4 1x/1.5x/2x 500 1 x 500mA* Resistor/PWM 85 0.9 0.98 <2.5 3x3 DFN-10 LTC3217 2.9 to 4.5 1x/1.5x/2x 600 4 x 150mA* Resistor/PWM 86 0.9 0.4 <4 3x3 QFN-16 LTC3215 2.9 to 4.4 1x/1.5x/2x 700 1 x 700mA* Resistor/PWM 90 0.9 0.3 <2.5 3x3 DFN-10 LTC3216 2.9 to 4.4 1x/1.5x/2x 1000 1 x 1A* Resistor/PWM 90 0.9 0.3 <2.5 3x4 DFN-12 * Flash Mode ** Dependent on VIN, VLED, ILED 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 11 10/24/08 3:43:57 PM MEDIUM CURRENT (100mA TO 350mA) LED DRIVERS – BUCK 09 03 Medium Current (100mA to 350mA) LED Drivers – Buck Medium-current inductor-based step-down switching LED drivers provide tiny, efficient high power LED lighting solutions for automotive, architectural and display backlighting. Key features include wide-ranging True Color PWM dimming, wide input voltage range, high side sensing and high switching frequency. Applications: . Automotive and Avionic Lighting . Architectural Detail Lighting . Display Backlighting . Constant Current Sources LT3592: 500mA Wide Input Voltage Range Step-Down LED Driver with 10:1 Dimming LT3592: Actual Size, Complete Solution LED Power Efficiency vs ILED 100 95 50/500mA Two Series Red LED Driver 90 VIN 0.1μF 10μH 1μF SW LT3592 DA CAP ON BRAKE SHDN BRIGHT OUT 140k 900kHz Part Number Topology 80 75 70 65 + 200/20mV – 60 0.47 4.7μF 55 50 51k RT GND BRIGHT 500mA 85 BOOST EFFICIENCY (%) VIN 7V TO 32V 4 12 20 16 INPUT VOLTAGE (V) 8 VFB 24 28 10k Dimming Type Max # of LEDs x ILED from 24VIN LED Configuration Input Voltage Range (V) Max. Output Voltage (V) ISW (A) Operating Efficiency (%) Package Medium Current (100mA to 350mA) LED Drivers – Buck LT3591 Buck 80:1 PWM 5 x 200mA Series 2.5 to 12 30 0.5 92 2x3 DFN-8 LT3517 Buck 5000:1 PWM 5 x 300mA Series 3 to 30 (40VMAX) 30 1.5 92 4x4 QFN-16 TSSOP-16E LT3592 Buck 10%/100% Analog 6 x 350mA Series 3 to 36 (60VMAX) 32 0.8 92 2x3 DFN-10 MSOP-10E LT3496 Buck 3000:1 PWM 3 x 5 x 300mA 3 x Multiple Series Strings 3 to 30 (40VMAX) 30 3 x 0.75 92 4x5 QFN-28 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 12 10/24/08 3:43:58 PM 10 02 MEDIUM CURRENT (100mA TO 350mA) LED DRIVERS – BOOST Medium Current (100mA to 350mA) LED Drivers – Boost Efficiency vs ILED Applications: . Automotive and Avionic Lighting . Architectural Detail Lighting . Display Backlighting . Constant Current Sources 95 PWM = 3V CTRL = 0V TO 1.2V 90 EFFICIENCY (%) 85 LT3496: Actual Size, Complete Solution 80 75 70 65 60 55 20 0 40 LT3496: Triple Output LED Driver PVIN 12V C1 2.2μF L1 10μH L2 10μH D2 CAP1 C3 1μF 17 D3 CAP2 M1 LED3 TG3 M2 100mA PWM1-3 SHDN Part Number SW1 CAP1-3 LED1-3 VIN PWM1-3 SHDN 10 LEDs Topology 825k OVP2 100mA 10 LEDs OVP3 100mA 20k SW2 20k SW3 LT3496 GND Dimming Type M3 825k OVP1 20k VIN 3V C5 1μF 17 LED2 TG2 825k 10 LEDs CAP3 C4 1μF 17 LED1 TG1 100 L3 10μH D1 C2 1μF 80 60 ILED (mA) Max # of LEDs x ILED from 12VIN TG1-3 OVP1-3 VC1-3 VREF FADJ CTRL1-3 LED Configuration 10k 470pF Input Voltage Range (V) Max. Output Voltage (V) ISW (A)* Operating Efficiency (%) Package Medium Current (100mA to 350mA) LED Drivers – Boost LT3486 Dual Boost 1000:1 PWM 2 x 8 x 100mA 2 x Series Strings 2.7 to 24 35 2 x 1.3 87 3x5 DFN-16 LT3517 Boost 5000:1 PWM 10 x 200mA Series 3 to 30 (40VMAX) 45 1.5 87 4x4 QFN-16 TSSOP-16E LT3518 Boost 5000:1 PWM 10 x 300mA Series 3 to 36 (60VMAX) 45 2.3 87 4x4 QFN-16 TSSOP-16E LT3496 Triple Boost 3000:1 PWM 3 x 10 x 100mA 3 x Series Strings 3 to 30 (40VMAX) 45 3 x 0.75 87 4x5 QFN-28 * IOUT ~ 0.65 ISW x (VIN / VOUT). Estimate: may vary depending on external component selection. 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 13 10/24/08 3:43:58 PM MEDIUM CURRENT (100mA TO 350mA) LED DRIVERS – BUCK-BOOST 11 03 Medium Current (100mA to 350mA) LED Drivers – Buck-Boost Efficiency Applications: . Automotive and Avionic Lighting . Architectural Detail Lighting . Display Backlighting . Constant Current Sources 90 VIN = 10V CTRL = VREF 80 LT3518: Full-Featured LED Driver with 2.3A Switch Current 70 EFFICIENCY (%) LT3518: Actual Size, Complete Solution 60 50 40 30 L1 4.3μH VIN 8V TO 16V SHDN VIN D1 20 R1 3.92M SW 0 C5 0.22μF 20 40 60 100 80 PWM DUTY CYCLE (%) FB R2 124k PWM PWM TGEN LT3518 RSENSE 330m7 VREF ISN CTRL C1 2.2μF TG M1 SYNC VC 300mA ISP RT SS C2 4.7μF GND RT 6.04k 2MHz C4 0.1μF Part Number Topology Dimming Type C3 0.1μF Max # of LEDs x ILED from 12VIN LED Configuration Input Voltage Range (V) Max. Output Voltage (V) ISW (A)* Operating Efficiency (%) Package Medium Current (100mA to 350mA) LED Drivers – Buck-Boost LT3517 Buck-Boost 5000:1 PWM 6 x 300mA Series 3 to 30 (40VMAX) 45 1.5 80 4x4 QFN-16 TSSOP-16E LT3518 Buck-Boost 5000:1 PWM 8 x 300mA Series 3 to 36 (60VMAX) 45 2.3 80 4x4 QFN-16 TSSOP-16E LT3496 Triple Buck-Boost 3000:1 PWM 3x6x 100mA 3 to 30 (40VMAX) 45 3 x 0.75 80 4x5 QFN-28 3 x Series Strings * IOUT ~ 0.65 ISW x (VIN / VOUT). Estimate: may vary depending on external component selection. 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 14 10/24/08 3:43:59 PM 12 02 L O W T O M E D I U M C U R R E N T ( 2 0 - 2 0 0 m A / L E D ) M U LT I D I S P L AY L E D D R I V E R S – I N D U C T O R B A S E D Low to Medium Current (20-200mA/LED) Multidisplay LED Drivers – Inductor Based Multidisplay inductor-based white LED drivers are capable of driving up to 20 white LEDs from a single cell Li-Ion input. Key features include high-voltage internal power switches, internal Schottky diodes, adjustable switching frequency, DC dimming control, open LED protection and optimized internal compensation. They are ideal solutions for multipanel LCD backlight applications or space-constrained portable applications such as cellular phones, PDAs and digital cameras. Applications: . Main/Sub-Displays . Digital Cameras, Sub-Notebook PCs . PDAs, Handheld Computers . Automotive LED Efficiency and Current vs PWM Duty Cycle LT3486: Dual 1.3A White LED Step-Up Converter with 1000:1 Dimming Range 90 120 EFFICIENCY 12V (TYP) 9V TO 15V EFFICIENCY (%) COUT1 2.2μF L2 10μH 5V D1 COUT2 2.2μF D2 C1 1μF 100 80 80 LED CURRENT 75 60 70 40 65 LED CURRENT (mA) L1 10μH 85 CIN 10μF 20 VIN = 12V 8/8 LEDs 60 VIN SW1 LUXEON LEDs LXCL-PWF1 0 SW2 OVP1 OVP2 VIN CTRL1 CTRL2 OFF ON SHDN LT3486 VIN REF 100mA PWM2 PWM1 CREF 0.1μF VC1 GND RT VC2 3.65k DIMMING INPUT 2 3.65k 21.5k PWM FREQ 1kHz Q1 100k 2.2nF 2.2nF Type Max # of LEDs x IOUT* LED Configuration LT3486: Actual Size, Complete Solution PWM FREQ 1kHz Q2 RFB2 2Ω RFB1 2Ω Dimming Type 0 100 100mA 22pF DIMMING INPUT 1 40 60 80 PWM DUTY CYCLE (%) FB2 FB1 Part Number LUXEON LEDs LXCL-PWF1 20 100k Input Voltage Range (V) Max. Output Voltage (V) ISW (mA) Operating Efficiency (%) Package Low to Medium Current Multidisplay LED Drivers – Inductor Based LT3466-1 LED Driver and Boost Converter DC/PWM 10 x 25mA Series 2.7 to 24 39.4 2 x 320 84 3x3 DFN-10 TSSOP-16E LT3466 Dual LED Driver DC/PWM 2 x 25 x 25mA Dual Series Strings 2.7 to 24 39.4 2 x 320 84 3x3 DFN-10 TSSOP-16E LTC3452 Synchronous Buck-Boost LED Driver DC/PWM 5 x 20mA + 1 x 200mA Parallel 2.7 to 5.5 4.5 1A 88 4x4 QFN-20 LT3486 Dual LED Driver 1000:1 PWM 2x8x 100mA Dual Series Strings 2.7 to 24 35.4 2 x 1.3A 85 3x4 DFN-16 TSSOP-16E * Dependent on Input Voltage, number of LEDs from a 12V Input 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 15 10/24/08 3:43:59 PM LOW CURRENT (20mA TO 50mA) LED DRIVERS – BUCK 13 03 Low Current (20mA to 50mA) LED Drivers – Buck Low current inductor-based step-down switching LED drivers provide tiny, efficient high power LED lighting solutions for automotive, architectural and display backlighting. Key features include wide-ranging True Color PWM dimming, wide input voltage range, high side sensing and high switching frequency. Applications: . Automotive and Avionics Lighting . Architectural Detail Lighting . Display Backlighting . Constant Current Sources LT3590: Actual Size, Complete Solution Conversion Efficiency LT3590: 48V Buck Mode 50mA LED Driver in 2mm x 2mm DFN 100 1μF 90 50mA EFFICIENCY (%) 47 VIN 48V 1μF CONTROL VIN LED LT3590 VREG 0.1μF Part Number Topology 70 60 470μH CTRL 80 50 SW 40 GND Dimming Type 0 Max # of LEDs x ILED from 40VIN 10 20 30 LED CURRENT (mA) LED Configuration Input Voltage Range (V) Max. Output Voltage (V) ISW (mA) Operating Efficiency (%) 40 50 Package Low Current (20mA to 50mA) LED Drivers – Buck LT3590 Buck 10:1 DC 8 x 50mA Series 4.5 to 55 40 80 90 2x2 DFN-6 SC-70 LT3517 Buck 5000:1 PWM 8 x 50mA Series 3 to 30 (40VMAX) 40 1.5A 92 4x4 QFN-16 TSSOP-16E LT3595 16-Channel Buck 5000:1 PWM 16 x 10 x 50mA 16 x Multiple Series Strings 4.5 to 45 45 16 x 0.09 92 5x9 QFN-56 LT3496 Buck 3000:1 PWM 3x8x 50mA 3 x Multiple Series Strings 3 to 30 (40VMAX) 40 3 x 0.75 95 4x5 QFN-28 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 16 10/24/08 3:44:00 PM 14 02 LOW CURRENT (20mA TO 50mA) LED DRIVERS – BOOST Low Current (20mA to 50mA) LED Drivers – Boost LT3593: 1MHz White LED Driver with Digitally Controlled Current Conversion Efficiency 90 1μF 1μF VIN SW CAP LT3593 SHUTDOWN AND CURRENT CONTROL LED CTRL VIN = 3.6V 10 LEDs 80 EFFI CIENCY (%) VIN 3V TO 5V LT3593: Actual Size, Complete Solution 10μH 70 60 50 GND 40 30 0 Part Number Type Dimming Type Max # of LEDs x IOUT* (VIN=3.6V) LED Configuration Input Voltage Range (V) Max. Output Voltage (V) 5 10 15 LED CURRENT (mA) ISW (mA)* Operating Efficiency (%) Package 20 Low Current (20mA to 50mA) LED Drivers – Boost LT3491 Boost LED Driver 300:1 PWM 6 x 25mA Series 2.5 to 12 27 260 76 SC70 LT3498 Boost LED and OLED Driver DC/PWM 6 x 20mA Series 2.5 to 12 32 300 + 180 77 2x3 DFN-12 LT3591 Boost LED Driver 90:1 PWM 10 x 25mA Series 2.5 to 12 42 450 77 2x3 DFN-8 LT3593 Boost LED Driver 32:1 Digital 10 x 25mA Series 2.5 to 5.5 45 550 80 2x2 DFN-6 ThinSOT LT3497 Dual Boost LED Driver 250:1 PWM 2 x 6 x 20mA 2 Parallel Series Strings of 6 2.5 to 10 32 2 x 300 77 2x3 DFN-10 LT3466 Dual Boost LED Driver DC/PWM 2 x 10 x 25mA 2 Parallel Series Strings of 10 2.7 to 24 40 2 x 320 84 3x3 DFN-10 LT3466-1 Boost LED Driver + Boost DC/PWM 10 x 25mA Series 2.7 to 24 40 2 x 320 84 3x3 DFN-10 LT3598 6-Channel Buck LED Driver 1000:1 PWM 6 x 10 x 30mA 6 x Multiple Series Strings 3 to 30 (40VMAX) 44 1.5A 88 4x4 QFN-24 LT1942 Quad DC/DC Converter and LED Driver DC/PWM 12 x 25mA 2 Parallel Series Strings of 6 2.6 to 16 44 550 77 4x4 QFN-24 * IOUT ~ 0.65 ISW x (VIN / VOUT). Estimate: may vary depending on external component selection. 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 17 10/24/08 3:44:01 PM M U LT I C H A N N E L L E D D R I V E R S F O R L A R G E L C D PA N E L S ( 3 0 m A T O 5 0 m A ) 15 03 Multichannel LED Drivers for Large LCD Panels (30mA to 50mA) LT3598 Efficiency – Adaptive Feedback Loop Maximizes Efficiency LT3598: 1.5A Boost Converter with 6-Channel 30mA LED Driver . Drives Six Strings of LEDs at Up to 30mA . 2% Accurate LED Current Regulation . Wide Input Voltage Range: . Operation from 3V to 30V . Transient Protection to 40V . Output Voltage Up to 50V . Regulates Current Even When V > V . Disconnects LEDs in Shutdown . Analog and PWM Dimming Control . Programmable Open LED Protection (Regulated) . OPENLED Alert Pin . Programmable LED Temperature Derating . Adjustable Frequency: 200kHz to 2.5MHz . Synchronizable to an External Clock . 4mm x 4mm QFN-24 Package IN 100 90 EFFICIENCY 80 70 60 50 OUT 40 30 0 5 10 15 20 LED CURRENT (mA) LT3598: Actual Size, Complete Solution LED Driver for 60 White LEDs 10μH VIN 2.2μF VIN 100k SW 4.7μF VOUT VO_SW OPENLED SHDN SHDN PWM PWM SYNC SYNC 2M FB 61.9k RT LT3598 VREF 10k CTRL 10k 43k TSET ISET SS LED1 LED2 LED3 LED4 LED5 LED6 GND VC 10nF 80k 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 18 10k 20mA 3.01k 10nF 10/24/08 3:44:01 PM 16 02 M U LT I C H A N N E L L E D D R I V E R S F O R L A R G E L C D PA N E L S ( 3 0 m A T O 5 0 m A ) Multichannel LED Drivers for Large LCD Panels (30mA to 50mA) LT3595: 16-Channel Buck Mode 50mA LED Driver Conversion Efficiency . Open LED Detection and Thermal Protection . 5mm × 9mm × 0.75mm QFN-56 Package 100 EFFICIENCY (%) . 4.5V to 45V Input Supply Range . Up to 50mA LED Current per Channel . 100mA, 45V Internal Switches . 8% Relative LED Current Match at 20mA . 16 Independent LED Channels . 5000:1 True Color PWM Dimming Range . LEDs Disconnected in Shutdown . Internal Schottky Diodes . Low Quiescent Current . 2MHz Switching Frequency . R Pin Sets Master LED Current . Typical Efficiency: 92% 5000:1 PWM Dimming at 100Hz 95 90 VPWM 5V/DIV ISW 50mA/DIV 85 10 20 30 ILED (mA) 40 50 ILED 20mA/DIV SET 400ns/DIV 10 LEDS AT 40mA 0.47µF 0.47µF 0.47µF 0.47µF 100µH VIN 45V 100µH 30W LED Driver for 160 LEDs (16 Strings, 10 LEDs per String) at 50mA 0.47µF 0.47µF 0.47µF 0.47µF 100µH 100µH 100µH 100µH 100µH 100µH 10µF LT3595: Actual Size, Complete Solution VCC LED BRIGHTNESS CONTROL 3V TO 5.5V L1 SW1 OPENLED PWM1 PWM2 PWM3 PWM4 PWM5 PWM6 PWM7 PWM8 SHDN VCC L16 SW16 L2 SW2 SW3 L3 SW4 L4 L5 SW5 L6 SW6 SW7 L7 SW8 L10 PWM9 PWM10 PWM11 PWM12 PWM13 PWM14 PWM15 PWM16 GND RSET SW9 L9 LT3595 L15 SW15 VIN SW14 L14 SW13 L13 L12 SW12 L11 SW11 VIN SW10 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 19 0.47µF 0.47µF 0.47µF 0.47µF 0.47µF LED BRIGHTNESS CONTROL 100µH 100µH 100µH 100µH 100µH 100µH 100µH 100µH 10µF 0.47µF L8 30.1k 100k 0.47µF 0.47µF 10/24/08 3:44:02 PM L O W C U R R E N T M U LT I D I S P L AY L E D D R I V E R S – I N D U C T O R L E S S 17 03 Low Current Multidisplay LED Drivers – Inductorless Applications: Our family of inductorless, charge pump-based multidisplay LED drivers feature the highest level of integration, smallest footprint and highest efficiency. Individual display driver outputs eliminate the need for ballast resistors, while the universal topology enables an even higher level of design flexibility without display type restrictions. These ICs optimize designs for a wide range of applications, from general illumination and keypads to portable products such as multidisplay cellular phones and high current/ high resolution camera flash devices. . Video Phones with QVGA+ Displays . Keyboard Lighting . General Lighting LTC3220/-1: Actual Size, Complete Solution LTC3220/-1: 360mA Universal 18-Channel LED Driver 2.2μF 2.2μF RGB1 C1P C1M C2P C2M VIN CPO VIN LTC3220 LTC3220-1 2.2μF DVCC DVCC ULED1-18 SCL/SDA RST RESET Part Number VIN (V) RGB3 RGB4 MAIN 4.7μF 18 0.1μF I2C RGB2 GND Conversion Ratio/ Boost Factor Total LED Current (mA) Max. # of White LEDs x ILED Display Types Number of Displays Dimming Control Maximum Operating Efficiency*** (%) Frequency (MHz) IQ (µA) ISD (µA) Package Low Current Multidisplay LED Drivers – Inductorless ++ LTC3212 2.7 to 5.5 1x/2x 75 3 x25mA RGB 3 1-wire 81 0.9 400 <3 2x3 DFN-12 LTC3230 2.7 to 5.5 1x/1.5x/2x 125 5x25mA Main, Sub, + 2 LDOs 2 1-wire 91 0.8 400 <3 3x3 QFN-20 LTC3219 2.9 to 5.5 1x/1.5x/2x 250 9x28mA Universal Up to 9 I2C 91 0.85 400 <2 3x3 QFN-20 LTC3220 LTC3220-1+ 2.9 to 5.5 1x/1.5x/2x 360 18x20mA Universal Up to 18 I2C 91 0.85 500 <4 4x4 UTQFN-28 LTC3206 2.8 to 4.5 1x/1.5x 400 (5+3+3)x 35mA Main, SUB, 3 RGB SPI* 90 1 180 <1 4x4 QFN-24 LTC3210/-1 2.9 to 4.5 1x/1.5x/2x 500 4x25mA + 1**x400mA Main, CAM 2 1-wire 93 0.8 400 <3 3x3 QFN-16 LTC3209-1 2.9 to 4.5 1x/1.5x/2x 600 6x25mA + 1x15mA + 1**x400mA Main, Aux, CAM 3 I2C 94 0.85 400 <3 4x4 QFN-20 LTC3209-2 2.9 to 4.5 1x/1.5x/2x 600 5x25mA + 1x15mA + 2**x200mA Main, Aux, CAM 3 I2C 94 0.85 400 <3 4x4 QFN-20 LTC3207 2.9 to 5.5 1x/1.5x/2x 600 12x28mA + 1**x425mA Universal, CAM Up to 13 I2C 91 0.85 500 <2 4x4 QFN-24 LTC3208 2.9 to 4.5 1x/1.5x/2x 1000 (4+2+3+4)x 27.5mA + 4x100mA Main, SUB, 5 RGB, Aux, CAM I2C 95 0.85 250 <1 5x5 QFN-32 * Serial Peripheral Interface ** High Current Camera LED >=200-425mA *** Dependent on VIN, VLED, ILED 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 20 + Different I2C address Red, Green, Blue LEDs ++ 10/24/08 3:44:03 PM 18 02 LOW CURRENT GENERAL PURPOSE LED DRIVERS – INDUCTORLESS Low Current General Purpose LED Drivers – Inductorless Our family of charge pumps includes the widest selection of simple and compact inductorless DC/DC converter designs. These step-up converters offer low ripple and can be used to boost an input voltage to drive parallel LEDs. By eliminating the inductor, these switched capacitor converters provide a small solution footprint and a simple design. The ICs efficiently drive low current white LEDs for a wide range of applications. Output Ripple vs Load Current Applications: 30 COUT = 2.2μF VIN = 3.6V 25 OUTPUT RIPPLE (mVp-p) . 2 AA Cell to 3.3V . Li-Ion/Polymer to 5V . USB On-the-Go Devices . LED Drivers . Handheld Devices 20 LTC3204-5 15 10 LTC3204B-5 5 0 0 25 50 75 100 LOAD CURRENT (mA) 125 150 LTC3204/B: Low Noise, Miniature 2x2 DFN Regulated Charge Pump Doubler 2.2μF LTC3204-5: Actual Size, Complete Solution 3V TO 4.2V Li-Ion BATTE RY C– V IN + 2.2μF (APPLY PWM WAVEFORM FOR ADJUSTABLE BRIGHTNESS CONTROL) Dimming Type DRIVE UP TO 5 LEDS 2.2μF LTC3204-5/ LTC3204B-5 SHDN ON OFF Part Number C+ V OUT 1007 1007 1007 1007 1007 GND V SHDN # of LEDs t LED Configuration VIN (V) Output Voltage (V) Total Output Current (mA) Maximum Operating Efficiency** (%) Package Low Current LED Drivers – Inductorless LTC3200 PWM 5+ parallel 2.7 to 4.5 Adj (1.268 to 5.4) 100 87 MSOP-8 LTC3200-5 PWM 5+ parallel 2.7 to 4.5 5 100 87 ThinSOT™ LTC3201 DAC 5+ parallel 2.7 to 4.5 Adj (3.19 to 4.6) 100 87 MSOP-10 LTC3202 DAC 6+ parallel 2.7 to 4.5 Adj (3.3 to 4.0) 125 87 3x3 DFN-10 MSOP-10 LTC3204-5* PWM 6+ parallel 2.7 to 5.5 5 150 93 2x2 DFN-6 LTC3204B-5 PWM 6+ parallel 2.7 to 5.5 5 150 93 2x2 DFN-6 LTC3203B PWM 6+ parallel 2.7 to 5.5 Adj (0.9 to 5.4) 500 90 3x3 DFN-10 LTC3203-1* PWM 6+ parallel 2.7 to 5.5 4.5, 5 500 90 3x3 DFN-10 LTC3203B-1 PWM 6+ parallel 2.7 to 5.5 4.5, 5 500 90 3x3 DFN-10 * Burst Mode® Operation ** Dependent on VIN, VLED, ILED 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 21 10/24/08 3:44:03 PM ORGANIC LED (OLED) BIAS – LOW TO HIGH CURRENT (50mA TO 2A) DRIVERS 19 03 Organic LED (OLED) Bias – Low to High Current (50mA to 2A) Drivers Linear Technology delivers highly integrated solutions for OLED bias applications. Key features include output disconnect, soft start and integrated Schottky diodes. Their small circuit size and high efficiency make them ideal solutions for space-conscious portable device applications such as cellular phones and media players. Applications: . Organic LED Power Supply . Digital Cameras . White LED Power Supply . Cellular Phones . Medical Diagnostic Equipment . Local ±5V or ±12V Supply . TFT-LCD Bias Supply LT3494: Actual Size, Complete Solution LT3494: Micropower Low Noise Boost Converter with Output Disconnect AVDD Efficiency vs VIN 90 280 VIN = 3.6V LOAD FROM CAPACITOR 80 15μH LOAD FROM VOUT EFFICIENCY (%) 70 4.7μF 0.22μF SW CAP VCC VOUT LT3494 2.21M SHDN FB CTRL GND VOUT 16V 16mA 2.2μF Part Number Configuration Topology Max. Output Voltage (V) 200 60 160 50 120 40 80 30 40 20 0.1 Input Voltage Range (V) 240 1 10 LOAD CURRENT (mA) POWER LOSS (mW) VIN 3V TO 4.2V 0 100 ISW (mA)* Operating Efficiency (%) Package Low to High Current (50mA to 2A) LED Drivers for Organic LED (OLED) LTC3459 Single Synchronous Boost 1.5 to 5.5 10 60 89 ThinSOT™ LT3464 Single Boost 2.3 to 10 34 85 84 ThinSOT™ LT3494/A Single Boost 2.3 to 16 40 150/300 85 2x3 DFN-8 LT3498 Dual Dual Boost 2.5 to 12 32 300/180 77 2x3 DFN-12 LT3463 Dual Boost and Inverter 2.4 to 15 ±40 180/320 77 3x3 DFN-10 LT3472 Dual Boost and Inverter 2.2 to 16 ±40 250/300 83 3x3 DFN-10 LT3582 Dual Boost and Inverter 2.58 to 5.5 ±14 290/500 83 3x4 QFN-16 LT3495(B)/-1 Single Boost 2.3 to 16 40 350/650 85 2x3 DFN-10 LT1613 Single Boost 0.9 to 10 34 550 89 ThinSOT™ LT3487 Dual Boost and Inverter 2.3 to 16 ±28 750/900 77 3x3 DFN-10 LT3473/A Single Boost 2.2 to 16 36 1.2A 77 3x3 DFN-8 LT3467/A Single Boost 2.4 to 16 40 1.4A 90 ThinSOT™ LT3471 Dual Boost or Inverter 2.4 to 16 ±40 2 x 1.5A 86 3x3 DFN-10 LTC3458/L Single Synchronous Boost 1.5 to 6 7.5/6 1.4A/1.7A 96 3x4 DFN-12 * IOUT ~ 0.65 ISW x (VIN / VOUT). Estimate: may vary depending on external component selection. 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 22 10/24/08 3:44:04 PM 20 02 LCD AND CCD BIAS POWER LCD and CCD Bias Power Applications: LCD and CCD Bias ICs deliver highly compact and efficient power supply solutions for small LCD displays. Key features include wide input voltage range, built-in inrush current limiting, output disconnect and power saving controls to simplify the task of implementing powerfriendly LCD displays. . Digital Still and Video Cameras . Cellular Handsets with Color Display . Scanner and Display Systems . Handheld Instruments . CCD Imager Bias . PDAs LT3587: High Voltage Monolithic Inverter and Dual Boost VVIN 2.5V TO 6V 10μH 15μH 1μF 2.2μF SW3 VIN SW1 CAP1 CAP3 IFB3 10μF CCD POSITIVE +15V, 50mA VOUT1 1M 8.06k GND LT3587: Actual Size, Complete Solution FB1 LT3587 2.7pF EN/SS3 CDD+ = 50mA 85 CDD– = 100mA LED = 20mA EFFICIENCY (%) 6.8pF 2.2μF VVIN 2.5V TO 6V 15μH 700 600 15μH 22μF CCD NEGATIVE –8V, 100mA ALL CHANNELS ENABLED 75 70 500 400 CDD– 65 LED 60 300 POWER DISSIPATION ALL CHANNELS ENABLED 200 100 55 50 1 0.5 NORMALIZED CURRENT 0 Part Number Number of Outputs VIN (V) VOUT (V) ISW (A)* POWER DISSIPATION (mW) FB2 SW2 CDD+ 80 1M FLT 800 90 LED DRIVER 20mA, UP TO 6 LEDS VOUT3 VFB3 EN/SS1 Frequency IQ (µA) Output Disconnect Package ThinSOT 0 1.5 Low to Medium Current LED Drivers for LCD and CCD Biasing LT1611 1 1.1 to 10 -34 0.55 1.4MHz 3mA – LT1945 1 1.2 to 15 ±34 0.25 Constant Off-Time 20 – MSOP-10 LT1618 1 1.6 to 18 36 1.50 1.4MHz 1.8mA – MSOP-10 LT3472 1 2.2 to 16 ±34 0.35 1.2MHz 2.8mA Yes 3x3 DFN-10 LT3473/A 1 2.2 to 16 34 1.20 1.2MHz 150 Yes 3x3 DFN-8 LT3464 1 2.3 to 10 34 0.085 Constant Off-Time 25 – ThinSOT LT3467 1 2.4 to 16 40 1.10 1.3MHz 1mA – ThinSOT LT3479 1 2.5 to 24 40 3.00 3.5MHz 5mA – 3x4 DFN-14 TSSOP-16 LT3461/A 1 2.5 to 16 38 0.30 1.3MHz/ 3MHz 2.8mA – ThinSOT LT1930/A 1 2.6 to 16 34 1.00 1.2MHz/ 2.2MHz 4.2mA/5.5mA – ThinSOT LT1931/A 1 2.6 to 16 -34 1.00 1.2MHz/ 2.2MHz 5.8mA – ThinSOT LTC1697 1 2.8 to 5.5 6 0.9 300kHz 0.9mA – MSOP-10 LT1617/-1 2 1.2 to 15 -34 0.35/0.10 Constant Off-Time 20 – ThinSOT LT3463/A 2 2.4 to 15 ±40 0.25 x 2 Constant Off-Time 40 Yes 3x3 DFN-10 LT3587 4 2.5 to 6 ±32 0.8/0.4/0.9 1.0MHz 2.4mA Yes 3x3 QFN-20 LT3471 2 2.4 to 16 ±40 2 x 1.30 1.2MHz 2.5mA – 3x3 DFN-10 LT3466-1 2 2.7 to 24 40 0.32 x 2 1.0MHz 5mA – 3x3 DFN-10 TSSOP-16E LTC3450 3 1.5 to 4.6 ±15 0.09 550kHz 75 – 3x3 QFN-16 LTC3524 5 2.5 to 6.0 5, ±20 0.5 1.5MHz 4.2mA Yes 4x4 QFN-24 LT1942 4 2.6 to 16 44 0.55/0.15/0.5/0.5 1MHz 7mA Yes 4x4 QFN-24 * IOUT ~ 0.65 ISW x (VIN / VOUT). Estimate: may vary depending on external component selection. 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 23 10/24/08 3:44:04 PM Sales Offices N ORTH A M ERICA N O RTH E R N C A L IF O R NI A / N E VA D A Indiana Tel: (317) 581-9055 Bay Area 720 Sycamore Dr. Milpitas, CA 95035 Tel: (408) 428-2050 Fax: (408) 432-6331 Iowa Tel: (319) 393-5763 Sacramento / Nevada 2260 Douglas Blvd., Ste. 280 Roseville, CA 95661 Tel: (916) 787-5210 Fax: (916) 787-0110 PA C IFIC N O RTH WE S T Denver 7007 Winchester Cir., Ste. 130 Boulder, CO 80301 Tel: (303) 926-0002 Fax: (303) 530-1477 Portland 5005 SW Meadows Rd., Ste. 410 Lake Oswego, OR 97035 Tel: (503) 520-9930 Fax: (503) 520-9929 Salt Lake City Tel: (801) 731-8008 Seattle 2018 156th Ave. NE, Ste. 100 Bellevue, WA 98007 Tel: (425) 748-5010 Fax: (425) 748-5009 SO U TH W E ST A R EA Los Angeles 21243 Ventura Blvd., Ste. 238 Woodland Hills, CA 91364 Tel: (818) 703-0835 Fax: (818) 703-0517 Orange County 15375 Barranca Pkwy., Ste. 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Yundang Building, #1002 Samsung-Dong 144-23 Kangnam-Ku, Seoul 135-090 Korea Tel: +82 (2) 792-1617 Fax: +82 (2) 792-1619 Linear Technology (UK) Ltd. 3 The Listons, Liston Road Marlow, Buckinghamshire SL7 1FD United Kingdom Tel: +44 (1628) 477066 Fax: +44 (1628) 478153 S IN G APORE Linear Technology Pte. Ltd. 507 Yishun Industrial Park A Singapore 768734 Tel: +65 6753-2692 Fax: +65 6752-0108 TAIWAN Linear Technology Corporation 8F-1, 77, Nanking E. Rd., Sec. 3 Taipei, Taiwan Tel: +886 (2) 2505-2622 Fax: +886 (2) 2516-0702 10/24/08 3:44:06 PM Linear Technology Corporation 1630 McCarthy Blvd. Milpitas, CA 95035-7417 1-800-4-LINEAR 408-432-1900 www.linear.com LW100815KU Archway image on Front cover © Philips, Lumileds 04109 CS3_LIN_LED_FA_10–7–08.r2.indd 25 10/24/08 3:44:06 PM