Power Management for LEDs

Transcription

1 VOL 2 Power Management for s High Performance Analog ICs 419 CS3_LIN FA_1 7 8.r2.indd 2 1/24/8 3:43:5 PM

2 s and Driver Technology s A light-emitting diode ( 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. s 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. s, however, produce light directly through electroluminescence, operate at low voltage and can deliver over 2% luminous efficiency. Key Advantages of s and Their Operation Versus Alternative Lighting Sources. High energy efficiency: s are 7x to 1x more efficient at producing light (lumens than incandescent bulbs. Extremely long life span: Typically 1, hours for s versus 1, hours for incandescent bulbs and 1, 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 s 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, s convert a much higher percentage of electrical power into light output, substantially reducing power consumption. Key advancements in reliability have enabled lifetimes in excess of 1, 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. Driver Technology driver circuits are available in several topologies:. Inductor-based Buck, Boost, Buck-Boost and SEPIC designs (these generally drive s in series or multiple strings of s in series:. currents range from a few milliamps to multiple amps. Efficiencies in excess of 9%. Drivers act as constant current sources. Many devices use high side current sense: string can be returned to ground 419 CS3_LIN FA_1 7 8.r2.indd 3 1/24/8 3:43:51 PM

3 . Inductorless charge pump-based Buck, Boost, Buck-Boost designs (these generally drive a single or strings in parallel:. currents range from a few milliamps to 1A. Average efficiencies over the Li-Ion battery range in excess of %. 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 current. The relation of (s forward voltage to the input voltage range: Buck, Boost, Buck-Boost, SEPIC or Flyback. Efficiency crucial for driving high brightness (HB s while minimizing thermal and battery life constraints. Current consumption required during off-time. characteristics dimming preserves chromatic characteristics across brightness levels and avoids color shifting. of s / serial or parallel. Total solution size and cost constraints ICs specifically designed as drivers tend to be smaller in size compared to general-purpose alternative solutions, increasing their appeal in space-constrained portable power applications. Popular switchmode driver configurations include Buck, Boost, Buck-Boost and SEPIC, and can deliver current from 3mA/ to 3A/ or more. Choosing the best driver or display bias power IC depends on many factors and tradeoffs. Linear Technology provides targeted solutions for most applications. Key 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 Driver Solutions Overview Linear Technology offers a broad line of drivers including both inductor-based (for s in series and inductorless (for s 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 current matching, a variety of dimming options and multiple output capability. This selection guide features Linear Technology solutions for a wide variety of driver applications. For more information on our latest products, visit our website at CS3_LIN FA_1 7 8.r2.indd 4 1/24/8 3:43:51 PM

4 page High Current Driver ICs (>35mA Switching Regulator-Based (Inductor, s in Series Buck Boost Buck-Boost SEPIC-Flyback Photoflash/Camera Torch Charge Pump-Based (Inductorless, s in Parallel Single Camera Flash/Torch Medium Current Driver ICs (1-35mA Switching Regulator-Based (Inductor, s in Series Buck Boost Buck-Boost Multidisplay Low Current Driver ICs (2mA to 9mA Switching Regulator-Based (Inductor, s in Series Multidisplay Buck for Large Panel TFT LCDs Boost Charge Pump-Based (Inductorless, s in Parallel Multidisplay General Purpose Multichannel Drivers for Large LCD Panels (3mA to 5mA O 19 Switching Regulator Based (Inductor LCD & CCD Bias 2 Switching Regulator Based (Inductor Series Driver ICs V TO 4V C1 INTV CC 1M 187k 1k 16.9k 1k NTC RT1 SHDN/UVLO V REF CTRL OPEN SS.1µF RT V C 28.7k 4kHz 1k LT3755 OUT INTV CC L1 22µH D1 FB ISP ISN GATE SENSE M1.15Ω.1Ω 1A 1M 23.7k 5W STRING C2.1µF M2 Parallel Driver ICs µF 2.2µF 2.2µF C1P C1M C2P C2M CPO LTC322 LTC322-1 RGB1 RGB2 RGB3 RGB4 MAIN DV CC.1µF DV CC U I 2 C RESET SCL/SDA RST 419 CS3_LIN FA_1 7 8.r2.indd 5 1/24/8 3:43:51 PM

5 HIGH CURRENT (35mA TO 1A DRIVERS BUCK 3 High Current (35mA to 1A Drivers Buck High-current inductor-based step-down switching drivers provide tiny, efficient high power lighting solutions for automotive, architectural and display backlighting. Key features include wide-ranging True Color dimming, wide input voltage range, high side sensing and high switching frequency. LT3756: 1V High Full Featured Driver Buck Mode 1A Driver with High Ratio and Open Reporting. Automotive and Avionic Lighting. Architectural Detail Lighting. Display Backlighting. Constant Current Sources LT3756: Actual Size, 24V TO V C1 1µF 1M 6.19k SHDN/UVLO V REF CTRL ISP ISN FB 1.5k.1 M3 1A 365k + 22V 22.1k 1k C3 1 Efficiency vs INTV CC OUT LT3756 M2 1k 5 WHITE s 2W 96.1µF 1k 28.7k 4kHz OPEN SS RT VC 47k.1µF GATE SENSE INTV CC C2 L1 D1 M1.43 C4 EFFICIENCY (% (V Topology Max # of s x I from 24 Configuration Input Range (V Max. (V I SW (A Efficiency (% Package High Current (35mA to 1A Drivers - Buck LT3474/-1 Buck 4:1 4 x 1A Series 3 to 3 15/ LT3592 Buck 1:1 Analog 4 x 5mA Series 4 to x2 DFN-1 MSOP-1E LT3517 Buck 5:1 5 x 1A Series 3 to 3 LT3518 Buck 5:1 5 x 1.5A Series 3 to 3 LT3496 Triple Buck 3:1 3 x 5 x.5a 3 x Series Strings 3 to x4 QFN x4 QFN x x5 QFN-28 LT3475/-1 Dual Buck 3:1 2 x 4 x 1.5A 2 x Series Strings 4 to 36 15/25 2 x TSSOP-2/E LT3478/-1 Buck 3:1 5 x 1.5A Series 2.7 to LT3476 Quad Buck 1:1 4 x 5 x 1A 4 x Series Strings 2.8 to x x7 QFN-38 LTC3783 Buck 3:1 5 x 1A + Series 3 to Ext FET 95 4x5 DFN-16 TSSOP-16 LT3755/-1 Buck 3:1 5 x 1A + Series 4.5 to 4 75 Ext FET 96 3x3 QFN-16 MSOP-16E LT3756 Buck 3:1 5 x 1A + Series 6 to 1 1 Ext FET 96 3x3 QFN-16 MSOP-16E 419 CS3_LIN FA_1 7 8.r2.indd 6 1/24/8 3:43:51 PM

6 2 4 HIGH CURRENT (35mA TO 1A DRIVERS BOOST High Current (35mA to 1A Drivers Boost High current inductor-based step-up switching drivers provide compact, efficient high power lighting solutions for automotive, architectural and display backlighting. Key features include wide-ranging True Color dimming, wide input voltage range, high side sensing and high switching frequency. LT3755: 75V High Full Featured Driver. Automotive and Avionic Lighting. Architectural Detail Lighting. Display Backlighting. Constant Current Sources LT3755: Boost Demo Circuit. Actual Size, 8V TO 4V 5W White Headlamp Driver C1 INTV CC 1M 187k 1k 16.9k 1k NTC RT1 SHDN/UVLO V REF LT3755 CTRL OPEN SS.1µF RT V C 28.7k 4kHz 1k OUT INTV CC L1 22µH D1 FB ISP ISN GATE SENSE M A 1M 23.7k 5W STRING C2 EFFICIENCY (% = 12V Efficiency vs Load.1µF M LOAD (A Topology Max # of s x I from 12 Configuration Input Range (V Max. (V I SW (A* Efficiency (% Package High Current (35mA to 1A Drivers Boost LT3486 Dual Boost 1:1 2 x 5 x 35mA 2x Series Strings 2.7 to x x5 DFN-16 LT3517 Boost 5:1 8 x 35mA Series 3 to x4 QFN-16 LT1618 Boost Analog/ 6 x 35mA Series 1.6 to x3 DFN-1 MSOP-1 LT3518 Boost 5:1 11 x 35mA Series 3 to 3 LT3496 Triple Boost 3:1 3 x 4 x 35mA 3 x Series Strings 3 to x4 QFN x x5 QFN-28 LT3478/-1 Boost 3:1 1 x 7mA Series 2.7 to LT3476 Quad Boost 1:1 4 x 8 x 35mA 4 x Series Strings 2.8 to x x7 QFN-38 LTC3783 Boost 3:1 1:1 Analog 1 x 1A Series 3 to Ext FET 93 4x5 DFN-16 TSSOP-16 LT3755/-1 Boost 3:1 15 x 1A Series 4.5 to 4 75 Ext FET 93 3x3 QFN-16 MSOP-16E LT3756 Boost 3:1 25 x.5a Series 6 to 1 1 Ext FET 93 3x3 QFN-16 MSOP-16E * I OUT ~.65 I SW x ( / V OUT. Estimate: may vary depending on external component selection. 419 CS3_LIN FA_1 7 8.r2.indd 7 1/24/8 3:43:54 PM

7 HIGH CURRENT (35mA TO 1A DRIVERS BUCK-BOOST 3 5 High Current (35mA to 1A Drivers Buck-Boost High current inductor-based buck-boost switching drivers provide flexible, tiny, efficient solutions for TFT backlighting, automotive and avionic lighting applications. Key features include high current, high voltage switches, adjustable currents, wide input voltage range, and high switching frequency. LT3476: High Current Quad Driver 5V to 25V Step-Up/Step-Down Driver for 2 Series 35 ma s. RGGB Lighting. Automotive and Avionic Lighting. TFT LCD Backlighting. Constant-Current Sources LT3476: Actual Size, P 5V TO 25V 35mA 35mA 35mA 35mA 1 3m 1µH 1µH 1µH 1µH m 3m 3m CAP1 2.2µF CAP2 CAP3 CAP4 2.2µF 2.2µF 2.2µF 1:1 at 1Hz 2.8V TO 16V 1-4 SHDN 2.2µF SW1 CAP SHDN SW2 SW3 LT3476 SW4 REF VADJ1-4 VC1-4 R T 1.5V 47k 47nF 5V/DIV I 5mA/ DIV 5µs/DIV Topology Max # of s x I from 12 Configuration Input Range (V High Current (35mA to 1A Drivers Buck-Boost LT3517 Buck-Boost 5:1 6 x 35mA Series 3 to 3 LT3518 Buck-Boost 5:1 6 x 5mA Series 3 to 3 LT3496 Triple Buck-Boost 3:1 3 x 35mA Series 3 to 3 Max. (V I SW (A Efficiency (% Package x4 QFN x4 QFN x.75 4x5 QFN-28 LT3478/-1 Buck-Boost 3:1 5 x 7mA Series 2.7 to LT3476 Quad Buck-Boost 1:1 4 x 5 x 35mA LTC3783 Buck-Boost 3:1 1:1 Analog 4 x Series Strings 2.8 to x 1.5 5x7 QFN-38 6 x 1A Series 3 to Ext FET 85 4x5 DFN-16 TSSOP-16 LT3755/-1 Buck-Boost 3:1 1 x 1A Series 4.5 to 4 75 Ext FET 85 3x3 QFN-16 MSOP-16E LT3756 Buck-Boost 3:1 15 x 1A Series 6 to 1 1 Ext FET 85 3x3 QFN-16 MSOP-16E 419 CS3_LIN FA_1 7 8.r2.indd 8 1/24/8 3:43:54 PM

8 2 6 HIGH CURRENT (35mA TO 1A DRIVERS SEPIC AND FLYBACK High Current (35mA to 1A Drivers SEPIC and Flyback High current inductor-based multitopology switching drivers provide flexible solutions for high voltage arrays. Key features include high current, wide input voltage range, scaleable output voltage, and wide-ranging True Color dimming.. High Power Applications. Industrial. Automotive LT3755: 75V High Full Featured Driver 2W SEPIC Driver LT3755: SEPIC Demo Circuit. Actual Size, 8V TO 4V C1 5V.1µF 1M INTV CC 187k 1k 28.7k 4kHz.1µF SHDN/UVLO V REF LT3755 CTRL OPEN GATE SS SENSE R T OUT V C INTV CC 3k FB ISP ISN C2 1V L1A 22µH 25k 511k C4 1µF 1V M1.15 D1 5A 1V L1B.1 M2 1A C3 5V 2W STRING EFFICIENCY (% V OUT = 18V I = 1A SEPIC Efficiency vs (V Topology Max # of s x I from 12 Configuration High Current (35mA to 1A Drivers SEPIC and Flyback LT3517 SEPIC/FlyBack 5:1 Input Range (V 4 x 35mA Series 3 to 3 Max. (V I SW (A Efficiency (% Package 45* 1.5 4x4 QFN-16 LT3518 SEPIC/FlyBack 5:1 6 x 35mA Series 3 to 3 45* 2.3 4x4 QFN-16 LT3478/-1 SEPIC/FlyBack 3:1 6 x 5mA Series 2.7 to 36 4* 4.5 LT3476 Quad SEPIC/ FlyBack 1:1 4 x 3 x 35mA 4 x Series Strings 2.8 to 16 36* 4 x 1.5 5x7 QFN-38 LTC3783 SEPIC/FlyBack 3:1 1:1 Analog 6 x 1A Series 3 to 36+ Limited by ext. FET Ext FET 85 4x5 DFN-16 TSSOP-16 LT3755/-1 SEPIC/FlyBack 3:1 LT3756 SEPIC/FlyBack 3:1 6 x 1A Series 4.5 to 4 75 Ext FET 85 3x3 QFN-16 MSOP-16E 8 x 1A Series 6 to 1 1 Ext FET 9 3x3 QFN-16 MSOP-16E * + V OUT 419 CS3_LIN FA_1 7 8.r2.indd 9 1/24/8 3:43:56 PM

9 MEDIUM TO HIGH CURRENT (1mA TO 2A DRIVERS FOR PHOTOFLASH/TORCH LIGHTING 3 7 Medium to High Current (1mA to 1A Drivers for Photoflash/Torch Lighting High current inductor-based switching 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.. Cell Phone Camera Flash. Cell Phone Torch Lighting. Digital Cameras. PDAs. Miscellaneous Li-Ion/Polymer-Based Driver Applications EFFICIENCY (% Power Efficiency vs I = 15mA I = 1A T A = 25 C EFFICIENCY = (V OUT V I / I IN (V LTC3454: 1A Synchronous Buck-Boost High Current Driver 1-CELL Li-ion 2.7V - 4.2V 1μF L1 5μH SW1 SW2 V OUT 1μF I LTC3454: Actual Size, LTC3454 EN1 (TORCH EN2 EN1 I (SHUTDOWN 1 15mA 1 85mA 1 1 1A EN2 (FLASH.1μF V C (EXPOSED PAD I SET1 I SET2 R ISET2 3.65k 1% R ISET1 2.5k 1% Topology (V V OUT (V* Max. Total Current (ma* Max. No. of White s Control Frequency (MHz I Q (ma I SD (µa Package Medium to High Current (1mA to 1A Drivers for PhotoFlash/Torch Lighting LTC3452 Buck-Boost 2.7 to DC/ 1.6 <1 4x4 QFN-2 LTC349 Boost 1. to DC/ <5 3x3 DFN-8 SO-8 LTC3453 Buck-Boost 2.7 to DC/ <6 4x4 QFN-16 LT1618 Buck-Boost 1.6 to DC/ <1 MSOP-1 LTC3454 Buck-Boost 2.7 to A 1 DC/ 1.8 <1 3x3 DFN-1 * voltage and current depend on the choice of external components 419 CS3_LIN FA_1 7 8.r2.indd 1 1/24/8 3:43:57 PM

10 2 8 HIGH CURRENT DRIVERS FOR CAMERA FLASH/TORCH INDUCTORLESS High Current Drivers for Camera Flash/Torch Inductorless Our family of inductorless charge pump-based camera driver products offers high efficiency and low ripple and can be used to boost an input voltage to drive high current s for camera torch (continuous and flash applications. By eliminating the inductor, these switched capacitor converters provide a small solution footprint and a simple design.. Camera Light Supply for Cellphones/DSCs/PDAs LTC3218: 4mA Single Wire Camera Charge Pump 1 Efficiency vs 9 2.9V TO 4.5V CP LTC3218 CM CPO 4.7μF EFFICIENCY (% 7 6 ENF 1 1 DISAB ENAB DISAB ENAB ENT I (SHUTDOWN 1 1mA (TORCH 29mA 1 39mA (FLASH ENF ENT I SETF I SETT I 1.2k 1% AOT mA 15mA 3mA (V LTC3218: Actual Size, (V Conversion Ratio/Boost Factor Total Current (ma Max. # of White s x I Control Maximum Efficiency** (% Frequency (MHz I Q (ma I SD (µa Package High Current (35mA to 1A Drivers for Camera Flash - Inductorless LTC to 4.5 1x/2x 4 1 x 4mA* Resistor/ <1 2x3 DFN-1 LTC to 4.4 1x/1.5x/2x 5 1 x 5mA* Resistor/ <2.5 3x3 DFN-1 LTC to 4.5 1x/1.5x/2x 6 4 x 15mA* Resistor/ <4 3x3 QFN-16 LTC to 4.4 1x/1.5x/2x 7 1 x 7mA* Resistor/ <2.5 3x3 DFN-1 LTC to 4.4 1x/1.5x/2x 1 1 x 1A* Resistor/ <2.5 3x4 DFN-12 * Flash Mode ** Dependent on, V, I 419 CS3_LIN FA_1 7 8.r2.indd 11 1/24/8 3:43:57 PM

11 MEDIUM CURRENT (1mA TO 35mA DRIVERS BUCK 3 9 Medium Current (1mA to 35mA Drivers Buck Medium-current inductor-based step-down switching drivers provide tiny, efficient high power lighting solutions for automotive, architectural and display backlighting. Key features include wide-ranging True Color dimming, wide input voltage range, high side sensing and high switching frequency.. Automotive and Avionic Lighting. Architectural Detail Lighting. Display Backlighting. Constant Current Sources LT3592: Actual Size, LT3592: 5mA Wide Input Range Step-Down Driver with 1:1 1 Power Efficiency vs I 5/5mA Two Series Red Driver 95 7V TO 32V ON BRAKE 14k 9kHz 1μF SHDN BRIGHT R T LT3592 BOOST SW DA CAP OUT V FB + 2/2mV 51k 1k.1μF 1μH.4 4.7μF EFFICIENCY (% BRIGHT 5mA INPUT VOLTAGE (V Topology Max # of s x I from 24 Configuration Input Range (V Max. (V I SW (A Efficiency (% Package Medium Current (1mA to 35mA Drivers Buck LT3591 Buck :1 5 x 2mA Series 2.5 to x3 DFN-8 LT3517 Buck 5:1 LT3592 Buck 1%/1% Analog 5 x 3mA Series 3 to 3 6 x 35mA Series 3 to 36 (6V MAX x4 QFN x3 DFN-1 MSOP-1E LT3496 Buck 3:1 3 x 5 x 3mA 3 x Multiple Series Strings 3 to x x5 QFN CS3_LIN FA_1 7 8.r2.indd 12 1/24/8 3:43:58 PM

12 2 1 MEDIUM CURRENT (1mA TO 35mA DRIVERS BOOST Medium Current (1mA to 35mA Drivers Boost. Automotive and Avionic Lighting. Architectural Detail Lighting. Display Backlighting. Constant Current Sources EFFICIENCY (% = 3V CTRL = V TO 1.2V Efficiency vs I LT3496: Actual Size, 65 6 LT3496: Triple Driver I (ma P 12V L1 1μH C1 L2 1μH L3 1μH C2 1μF TG1 D1 D2 D3 CAP1 CAP2 CAP3 1 1 C3 1μF 1 2 C4 1μF M1 TG2 M2 TG3 M s 1mA 825k 2k OVP1 1 s 1mA 825k 2k OVP2 1 s 1mA 825k 2k OVP3 3V C5 1μF 1-3 SHDN SW1 CAP SHDN SW2 LT3496 SW3 TG1-3 OVP1-3 VC1-3 V REF FADJ CTRL1-3 1k 47pF Topology Max # of s x I from 12 Medium Current (1mA to 35mA Drivers Boost LT3486 Dual Boost 1:1 Configuration 2 x 8 x 1mA 2 x Series Strings Input Range (V Max. (V I SW (A* Efficiency (% Package 2.7 to x x5 DFN-16 LT3517 Boost 5:1 LT3518 Boost 5:1 1 x 2mA Series 3 to 3 1 x 3mA Series 3 to 36 (6V MAX x4 QFN x4 QFN-16 LT3496 Triple Boost 3:1 3 x 1 x 1mA 3 x Series Strings 3 to x x5 QFN-28 * I OUT ~.65 I SW x ( / V OUT. Estimate: may vary depending on external component selection. 419 CS3_LIN FA_1 7 8.r2.indd 13 1/24/8 3:43:58 PM

13 MEDIUM CURRENT (1mA TO 35mA DRIVERS BUCK-BOOST 3 11 Medium Current (1mA to 35mA Drivers Buck-Boost. Automotive and Avionic Lighting. Architectural Detail Lighting. Display Backlighting. Constant Current Sources LT3518: Full-Featured Driver with 2.3A Switch Current LT3518: Actual Size, EFFICIENCY (% = 1V CTRL = V REF Efficiency 8V TO 16V C1 SHDN TGEN V REF CTRL SYNC LT3518 L1 4.3μH SW FB ISP ISN TG D1 R1 3.92M R2 124k R SENSE 33m M1 3mA C2 4.7μF C5.22μF DUTY CYCLE (% V C R T SS C4.1μF R T 6.4k 2MHz C3.1μF Topology Max # of s x I from 12 Configuration Input Range (V Max. (V I SW (A* Efficiency (% Package Medium Current (1mA to 35mA Drivers Buck-Boost LT3517 Buck-Boost 5:1 LT3518 Buck-Boost 5:1 6 x 3mA Series 3 to 3 8 x 3mA Series 3 to 36 (6V MAX x4 QFN x4 QFN-16 LT3496 Triple Buck-Boost 3:1 3 x 6 x 1mA 3 x Series Strings 3 to x.75 4x5 QFN-28 * I OUT ~.65 I SW x ( / V OUT. Estimate: may vary depending on external component selection. 419 CS3_LIN FA_1 7 8.r2.indd 14 1/24/8 3:43:59 PM

14 2 12 LOW TO MEDIUM CURRENT (2-2mA/ MULTIDISPLAY DRIVERS INDUCTOR BASED Low to Medium Current (2-2mA/ Multidisplay Drivers Inductor Based Multidisplay inductor-based white drivers are capable of driving up to 2 white s 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 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.. Main/Sub-Displays. Digital Cameras, Sub-Notebook PCs. PDAs, Handheld Computers. Automotive LT3486: Dual 1.3A White Step-Up Converter with 1:1 Range LUXEON s LXCL-PWF1 1mA C OUT1 OFF ON D1 SW1 OVP1 CTRL1 SHDN 1 L1 1μH 12V (TYP 9V TO 15V 5V C1 1μF LT3486 L2 1μH C IN 1μF SW2 OVP2 CTRL2 REF 2 D2 C OUT2 C REF.1μF LUXEON s LXCL-PWF1 1mA EFFICIENCY (% Efficiency and Current vs Duty Cycle EFFICIENCY CURRENT = 12V 8/8 s DUTY CYCLE (% CURRENT (ma FB1 V C1 R T FB2 V C2 FREQ 1kHz DIMMING INPUT 1 1k Q1 R FB1 2Ω 3.65k 2.2nF 21.5k 22pF 3.65k 2.2nF Q2 R FB2 2Ω DIMMING INPUT 2 1k FREQ 1kHz LT3486: Actual Size, Max # of s x I OUT * Configuration Input Range (V Max. (V I SW (ma Efficiency (% Package Low to Medium Current Multidisplay Drivers Inductor Based LT Driver and Boost Converter DC/ 1 x 25mA Series 2.7 to x x3 DFN-1 LT3466 Dual Driver DC/ 2 x 25 x 25mA Dual Series Strings 2.7 to x x3 DFN-1 LTC3452 Synchronous Buck-Boost Driver DC/ 5 x 2mA + 1 x 2mA Parallel 2.7 to A 88 4x4 QFN-2 LT3486 Dual Driver 1:1 2 x 8 x 1mA Dual Series Strings 2.7 to x 1.3A 85 3x4 DFN-16 * Dependent on Input, number of s from a 12V Input 419 CS3_LIN FA_1 7 8.r2.indd 15 1/24/8 3:43:59 PM

15 LOW CURRENT (2mA TO 5mA DRIVERS BUCK 3 13 Low Current (2mA to 5mA Drivers Buck Low current inductor-based step-down switching drivers provide tiny, efficient high power lighting solutions for automotive, architectural and display backlighting. Key features include wide-ranging True Color dimming, wide input voltage range, high side sensing and high switching frequency.. Automotive and Avionics Lighting. Architectural Detail Lighting. Display Backlighting. Constant Current Sources LT359: Actual Size, LT359: 48V Buck Mode 5mA Driver in 2mm x 2mm DFN Conversion Efficiency 1μF 1 9 5mA 48V CONTROL 1μF CTRL 4 47μH EFFICIENCY (% 7 6 LT359 VREG SW 5.1μF CURRENT (ma Topology Max # of s x I from 4 Configuration Input Range (V Max. (V I SW (ma Efficiency (% Package Low Current (2mA to 5mA Drivers Buck LT359 Buck 1:1 DC 8 x 5mA Series 4.5 to x2 DFN-6 SC-7 LT3517 Buck 5:1 8 x 5mA Series 3 to A 92 4x4 QFN-16 LT Channel Buck 5:1 16 x 1 x 5mA 16 x Multiple Series Strings 4.5 to x x9 QFN-56 LT3496 Buck 3:1 3 x 8 x 5mA 3 x Multiple Series Strings 3 to x x5 QFN CS3_LIN FA_1 7 8.r2.indd 16 1/24/8 3:44: PM

16 2 14 LOW CURRENT (2mA TO 5mA DRIVERS BOOST Low Current (2mA to 5mA Drivers Boost LT3593: 1MHz White Driver with Digitally Controlled Current 3V TO 5V SHUTDOWN AND CURRENT CONTROL 1μF CTRL 1μH LT3593 SW CAP 1μF LT3593: Actual Size, EFFI CIENCY (% = 3.6V 1 s Conversion Efficiency CURRENT (ma Max # of s x I OUT * ( =3.6V Configuration Input Range (V Max. (V I SW (ma* Efficiency (% Package Low Current (2mA to 5mA Drivers Boost LT3491 Boost Driver 3:1 6 x 25mA Series 2.5 to SC7 LT3498 Boost and O Driver DC/ 6 x 2mA Series 2.5 to x3 DFN-12 LT3591 Boost Driver 9:1 1 x 25mA Series 2.5 to x3 DFN-8 LT3593 Boost Driver 32:1 Digital 1 x 25mA Series 2.5 to x2 DFN-6 ThinSOT LT3497 Dual Boost Driver 25:1 2 x 6 x 2mA 2 Parallel Series Strings of to x x3 DFN-1 LT3466 Dual Boost Driver DC/ 2 x 1 x 25mA 2 Parallel Series Strings of to x x3 DFN-1 LT Boost Driver + Boost DC/ 1 x 25mA Series 2.7 to x x3 DFN-1 LT Channel Buck Driver 1:1 6 x 1 x 3mA 6 x Multiple Series Strings 3 to A 88 4x4 QFN-24 LT1942 Quad DC/DC Converter and Driver DC/ 12 x 25mA 2 Parallel Series Strings of to x4 QFN-24 * I OUT ~.65 I SW x ( / V OUT. Estimate: may vary depending on external component selection. 419 CS3_LIN FA_1 7 8.r2.indd 17 1/24/8 3:44:1 PM

17 MULTICHANNEL DRIVERS FOR LARGE LCD PANELS (3mA TO 5mA 3 15 Multichannel Drivers for Large LCD Panels (3mA to 5mA LT3598: 1.5A Boost Converter with 6-Channel 3mA Driver. Drives Six Strings of s at Up to 3mA. 2% Accurate Current Regulation. Wide Input Range:. Operation from 3V to 3V. Transient Protection to 4V. Up to 5V. Regulates Current Even When > V OUT. Disconnects s in Shutdown. Analog and Control. Programmable Open Protection (Regulated. OPEN Alert Pin. Programmable Temperature Derating. Adjustable Frequency: 2kHz to 2.5MHz. Synchronizable to an External Clock. 4mm x 4mm QFN-24 Package Driver for 6 White s EFFICIENCY LT3598 Efficiency Adaptive Feedback Loop Maximizes Efficiency CURRENT (ma LT3598: Actual Size, 1μH 1k SW V OUT V O_SW 4.7μF OPEN 2M SHDN SHDN FB 61.9k SYNC SYNC RT LT3598 V REF 43k 1k 1k CTRL T SET I SET SS V C 2mA k 1k 1nF 3.1k 1nF 419 CS3_LIN FA_1 7 8.r2.indd 18 1/24/8 3:44:1 PM

18 2 16 MULTICHANNEL DRIVERS FOR LARGE LCD PANELS (3mA TO 5mA Multichannel Drivers for Large LCD Panels (3mA to 5mA LT3595: 16-Channel Buck Mode 5mA Driver. Open Detection and Thermal Protection. 5mm 9mm.75mm QFN-56 Package. 4.5V to 45V Input Supply Range. Up to 5mA Current per Channel. 1mA, 45V Internal Switches. 8% Relative Current Match at 2mA. 16 Independent Channels. 5:1 True Color Range. s Disconnected in Shutdown. Internal Schottky Diodes. Low Quiescent Current. 2MHz Switching Frequency. R SET Pin Sets Master Current. Typical Efficiency: 92% V 5V/DIV I SW 5mA/DIV I 2mA/DIV 5:1 at 1Hz 1 S AT 4mA 4ns/DIV EFFICIENCY (% Conversion Efficiency I (ma 3W Driver for 16 s (16 Strings, 1 s per String at 5mA 45V 1µF.47µF.47µF.47µF.47µF.47µF.47µF.47µF.47µF LT3595: Actual Size, V CC BRIGHTNESS CONTROL 3V TO 5.5V 1k 1µF L1 SW1 L2 SW2 SW3 L3 SW4 L4 L5 SW5 L6 SW6 SW7 L7 SW8 L8 OPEN LT SHDN V CC R SET L16 SW16 L15 SW15 SW14 L14 SW13 L13 L12 SW12 L11 SW11 SW1 L1 SW9 L9 3.1k BRIGHTNESS CONTROL.47µF.47µF.47µF.47µF.47µF.47µF.47µF.47µF 419 CS3_LIN FA_1 7 8.r2.indd 19 1/24/8 3:44:2 PM

19 LOW CURRENT MULTIDISPLAY DRIVERS INDUCTORLESS 3 17 Low Current Multidisplay Drivers Inductorless Our family of inductorless, charge pump-based multidisplay 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 LTC322/-1: Actual Size, LTC322/-1: 36mA Universal 18-Channel Driver C1P C1M C2P C2M CPO LTC322 LTC μF RGB1 RGB2 RGB3 RGB4 MAIN DV CC.1μF DV CC U I 2 C RESET SCL/SDA RST (V Conversion Ratio/ Boost Factor Total Current (ma Max. # of White s x I Display s of Displays Control Maximum Efficiency*** (% Frequency (MHz I Q (µa I SD (µa Package Low Current Multidisplay Drivers Inductorless LTC to 5.5 1x/2x x25ma RGB 3 1-wire <3 2x3 DFN-12 LTC323 LTC3219 LTC322 LTC LTC326 LTC321/-1 LTC329-1 LTC329-2 LTC327 LTC to to to to to to to to to 4.5 1x/1.5x/2x 125 5x25mA Main, Sub, + 2 LDOs 2 1-wire <3 3x3 QFN-2 1x/1.5x/2x 25 9x28mA Universal Up to 9 I 2 C <2 3x3 QFN-2 1x/1.5x/2x 36 18x2mA Universal Up to 18 I 2 C <4 4x4 UTQFN-28 1x/1.5x 4 (5+3+3x 35mA 1x/1.5x/2x 5 4x25mA + 1**x4mA 1x/1.5x/2x 6 6x25mA + 1x15mA + 1**x4mA 1x/1.5x/2x 6 5x25mA + 1x15mA + 2**x2mA 1x/1.5x/2x 6 12x28mA + 1**x425mA 1x/1.5x/2x 1 ( x 27.5mA + 4x1mA Main, SUB, RGB 3 SPI* <1 4x4 QFN-24 Main, CAM 2 1-wire <3 3x3 QFN-16 Main, Aux, CAM Main, Aux, CAM Universal, CAM Main, SUB, RGB, Aux, CAM 3 I 2 C <3 4x4 QFN-2 3 I 2 C <3 4x4 QFN-2 Up to 13 I 2 C <2 4x4 QFN-24 5 I 2 C <1 5x5 QFN-32 * Serial Peripheral Interface ** High Current Camera >=2-425mA *** Dependent on, V, I + Different I 2 C address ++ Red, Green, Blue s 419 CS3_LIN FA_1 7 8.r2.indd 2 1/24/8 3:44:3 PM

20 2 18 LOW CURRENT GENERAL PURPOSE DRIVERS INDUCTORLESS Low Current General Purpose 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 s. By eliminating the inductor, these switched capacitor converters provide a small solution footprint and a simple design. The ICs efficiently drive low current white s for a wide range of applications.. 2 AA Cell to 3.3V. Li-Ion/Polymer to 5V. USB On-the-Go Devices. Drivers. Handheld Devices OUTPUT RIPPLE (mvp-p Ripple vs Load Current C OUT = = 3.6V LTC324-5 LTC324B LOAD CURRENT (ma LTC324/B: Low Noise, Miniature 2x2 DFN Regulated Charge Pump Doubler C C + DRIVE UP TO 5 S LTC324-5: Actual Size, 3V TO 4.2V Li-Ion BATTERY + V OUT LTC324-5/ LTC324B ON OFF SHDN (APPLY WAVEFORM FOR ADJUSTABLE BRIGHTNESS CONTROL V SHDN t # of s Configuration (V (V Total Current (ma Maximum Efficiency** (% Package Low Current Drivers Inductorless LTC32 5+ parallel 2.7 to 4.5 Adj (1.268 to MSOP-8 LTC parallel 2.7 to ThinSOT LTC321 DAC 5+ parallel 2.7 to 4.5 Adj (3.19 to MSOP-1 LTC322 DAC 6+ parallel 2.7 to 4.5 Adj (3.3 to x3 DFN-1 MSOP-1 LTC324-5* 6+ parallel 2.7 to x2 DFN-6 LTC324B-5 6+ parallel 2.7 to x2 DFN-6 LTC323B 6+ parallel 2.7 to 5.5 Adj (.9 to x3 DFN-1 LTC323-1* 6+ parallel 2.7 to , x3 DFN-1 LTC323B-1 6+ parallel 2.7 to , x3 DFN-1 * Burst Mode Operation ** Dependent on, V, I 419 CS3_LIN FA_1 7 8.r2.indd 21 1/24/8 3:44:3 PM

21 ORGANIC (O BIAS LOW TO HIGH CURRENT (5mA TO 2A DRIVERS 3 19 Organic (O Bias Low to High Current (5mA to 2A Drivers Linear Technology delivers highly integrated solutions for O 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. LT3494: Actual Size,. Organic Power Supply. Digital Cameras. White Power Supply. Cellular Phones. Medical Diagnostic Equipment. Local ±5V or ±12V Supply. TFT-LCD Bias Supply LT3494: Micropower Low Noise Boost Converter with Disconnect 3V TO 4.2V 4.7μF 15μH SW CAP V CC V OUT LT3494 SHDN FB.22μF 2.21M V OUT 16V 16mA EFFICIENCY (% = 3.6V AV DD Efficiency vs LOAD FROM CAPACITOR LOAD FROM V OUT POWER LOSS (mw CTRL LOAD CURRENT (ma Configuration Topology Input Range (V Max. (V I SW (ma* Efficiency (% Package Low to High Current (5mA to 2A Drivers for Organic (O LTC3459 Single Synchronous Boost 1.5 to ThinSOT LT3464 Single Boost 2.3 to ThinSOT LT3494/A Single Boost 2.3 to /3 85 2x3 DFN-8 LT3498 Dual Dual Boost 2.5 to /1 77 2x3 DFN-12 LT3463 Dual Boost and Inverter 2.4 to 15 ±4 1/ x3 DFN-1 LT3472 Dual Boost and Inverter 2.2 to 16 ±4 25/3 83 3x3 DFN-1 LT3582 Dual Boost and Inverter 2.58 to 5.5 ±14 29/5 83 3x4 QFN-16 LT3495(B/-1 Single Boost 2.3 to / x3 DFN-1 LT1613 Single Boost.9 to ThinSOT LT3487 Dual Boost and Inverter 2.3 to 16 ±28 75/9 77 3x3 DFN-1 LT3473/A Single Boost 2.2 to A 77 3x3 DFN-8 LT3467/A Single Boost 2.4 to A 9 ThinSOT LT3471 Dual Boost or Inverter 2.4 to 16 ±4 2 x 1.5A 86 3x3 DFN-1 LTC3458/L Single Synchronous Boost 1.5 to 6 7.5/6 1.4A/1.7A 96 3x4 DFN-12 * I OUT ~.65 I SW x ( / V OUT. Estimate: may vary depending on external component selection. 419 CS3_LIN FA_1 7 8.r2.indd 22 1/24/8 3:44:4 PM

22 2 2 LCD AND CCD BIAS POWER LCD and CCD Bias Power 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. LT3587: High Monolithic Inverter and Dual Boost V VIN 2.5V TO 6V 1μF 8.6k V VIN 2.5V TO 6V SW3 CAP3 IFB3 EN/SS1 EN/SS3 FLT 15μH 1μH SW2 VIN LT μH SW1 CAP1 VOUT1 FB1 VOUT3 VFB3 FB2 15μH 1μF 1M 2.7pF 1M 6.8pF CCD POSITIVE +15V, 5mA 22μF DRIVER 2mA, UP TO 6 S CCD NEGATIVE 8V, 1mA EFFICIENCY (%. Digital Still and Video Cameras. Cellular Handsets with Color Display. Scanner and Display Systems. Handheld Instruments. CCD Imager Bias. PDAs CDD+ = 5mA CDD = 1mA = 2mA CDD LT3587: Actual Size, CDD+ ALL CHANNELS ENAB POWER DISSIPATION ALL CHANNELS ENAB POWER DISSIPATION (mw NORMALIZED CURRENT of s (V V OUT (V I SW (A* Frequency I Q (µa Disconnect Package Low to Medium Current Drivers for LCD and CCD Biasing LT to MHz 3mA ThinSOT LT to 15 ±34.25 Constant Off-Time 2 MSOP-1 LT to MHz 1.8mA MSOP-1 LT to 16 ± MHz 2.8mA Yes 3x3 DFN-1 LT3473/A to MHz 15 Yes 3x3 DFN-8 LT to Constant Off-Time 25 ThinSOT LT to MHz 1mA ThinSOT LT to MHz 5mA 3x4 DFN-14 TSSOP-16 LT3461/A to MHz/ 3MHz 2.8mA ThinSOT LT193/A to MHz/ 2.2MHz 4.2mA/5.5mA ThinSOT LT1931/A to MHz/ 2.2MHz 5.8mA ThinSOT LTC to kHz.9mA MSOP-1 LT1617/ to /.1 Constant Off-Time 2 ThinSOT LT3463/A to 15 ±4.25 x 2 Constant Off-Time 4 Yes 3x3 DFN-1 LT to 6 ±32.8/.4/.9 1.MHz 2.4mA Yes 3x3 QFN-2 LT to 16 ±4 2 x MHz 2.5mA 3x3 DFN-1 LT to x 2 1.MHz 5mA 3x3 DFN-1 LTC to 4.6 ± kHz 75 3x3 QFN-16 LTC to 6. 5, ± MHz 4.2mA Yes 4x4 QFN-24 LT to /.15/.5/.5 1MHz 7mA Yes 4x4 QFN-24 * I OUT ~.65 I SW x ( / V OUT. Estimate: may vary depending on external component selection. 419 CS3_LIN FA_1 7 8.r2.indd 23 1/24/8 3:44:4 PM

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24 Linear Technology Corporation 163 McCarthy Blvd. Milpitas, CA LINEAR LW1815KU Archway image on Front cover Philips, Lumileds 419 CS3_LIN FA_1 7 8.r2.indd 25 1/24/8 3:44:6 PM