LT3003 3-Channel Ballaster with DESCRIPTION LT®3003 drives three
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LT3003 3-Channel Ballaster with DESCRIPTION
LT®3003 drives three separate strings LEDs 350mA/channel with accurate current matching, resulting uniform brightness intensity. This approach superior conventional methods running three separate channels with external ballast resistors requiring expensive factory calibration. LT3003 operates boost, buck buck-boost mode. True Color Dimming ratio 3000:1 achievable using logic-level signal modes without need external level-shifting circuitry. applications with input supply above below output voltage strings, LT3003 allows LEDs returned input supply (buck-boost mode) instead being limited only SEPIC solutions. LT3003 ideal high power driver applications such backlighting heads-up displays. Additional overtemperature outputs allow appropriate system management increased reliability. LT3003 available small 10-pin package.
Lare registered trademarks Linear Technology Corporation. True Color trademark Linear Technolology Corporation. other trademarks property their respective owners.
Current Matching 350mA Continuous Current String 3000:1 True Color PWMDimming Range Input Disconnects Strings Operate Buck, Boost Buck-Boost Modes Wide Input Range: Overtemperature Outputs Works with LT1618, LT3477, LT3474, LT3475, LT3476, LTC®3783 Thermally Enhanced 10-Pin MSOP Package
APPLICATIONS
High Power Ballaster Automotive Lighting Video Cameras Backlighting
TYPICAL APPLICATION
Buck Mode LT3003 with LT3476
PVIN
Efficiency
LEDs 350mA STRING
0.33µF
LED1 VMAX SHDN DIMMING
LED2 LT3003
LED3
EFFICIENCY
10µF
10µH
PVIN NUMBER LEDS 1000 TOTAL CURRENT (mA) 1200
SIMPLIFIED LT3476
3003 TA01a
3003 TA01b
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LT3003 ABSOLUTE MAXIMUM RATINGS
(Note
PACKAGE/ORDER INFORMATION
VIEW LED1 LED2 LED3 VMAX SHDN
.40V LED1, LED2, LED3 .48V VMAX, SHDN .48V .36V .36V .15V OT1, OT2.6V Operating Junction Temperature Range (Notes -40°C 125°C Storage Temperature Range. -65°C 150°C Lead Temperature (Soldering, sec) 300°C
PACKAGE 10-LEAD PLASTIC MSOP TJMAX 125°C, 35°C/W EXPOSED (PIN GND, MUST SOLDERED
ORDER PART NUMBER LT3003EMSE
PART MARKING LTCFF
Order Options Tape Reel: Lead Free: #PBF Lead Free Tape Reel: #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ Consult Marketing parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
PARAMETER Operational Input Voltage Minimum (VIN VEE) Quiescent Current Shutdown Current VMAX Quiescent Current SHDN Threshold Current Matching |LED2 LED1|, |LED2 LED3| Current Matching with Voltage Mismatch Voltage LED1, LED2, LED3 Maximum Current LED1, LED2, LED3 Maximum Leakage Current Switching Threshold Turn-On Delay (PWM ILED Current Buck Mode Overtemperature Sense Point (OT1, OT2) Overtemperature Hysteresis Point Pull-Down Current
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. VMAX ILED2 100mA, Open, SHDN VIN.
CONDITIONS ILED1,2,3 100mA ILED1,2,3 100mA ILED1,2,3 100mA VLED1 VLED2 VLED3 SHDN ILED1,2,3 ILED2 100mA VLED1 VLED2 VLED3 ILED2 100mA, VLED1 VLED2 VLED3 ILED2 350mA, VLED1 VLED2 VLED3 ILED2 350mA, (|VLED2 VLED1| |VLED2 VLED3|) 700mV ILED2 100mA VLED1,2,3 1.5V VLED1,2,3 ILED1,2,3 100mA ILED 50mA VMAX 40V, 39V, (Note (Note 0.3V (Note
UNITS
10.5 0.25 -3.5 from Overtemp Sense Point
+3.5
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LT3003 ELECTRICAL CHARACTERISTICS
PARAMETER Pull-Down Current OT1, Leakage Current
denotes specifications which apply over full operating temperature range, otherwise specifications 25°C. VMAX ILED2 100mA, Open, SHDN VIN.
CONDITIONS 0.3V (Note UNITS
Note Stresses beyond those listed under Absolute Maximum Ratings cause permanent damage device. Exposure Absolute Maximum Rating condition extended periods affect device reliability lifetime. Note LT3003E guaranteed meet performance specifications from 85°C junction temperature. Specifications over -40°C 125°C operating junction temperature range assured design, characterization correlation with statistical process controls.
Note This includes overtemperature protection that intended protect device during momentary overload conditions. Junction temperature will exceed 125°C when overtemperature protection active. Continuous operation above specified maximum operating junction temperature impair device reliability. Note Correlation static test 25°C. Note Guaranteed design.
TYPICAL PERFORMANCE CHARACTERISTICS
ILED1,3 ILED2 Matching
INPUT QUIESCENT CURRENT (mA) ILED (mA) ILED1,3 ILED2 ILED2 LED2 350mA VLED1 VLED2 VLED3 JUNCTION TEMPERATURE (°C)
25°C unless otherwise noted. Current (Out Pin) Temperature
CURRENT (nA)
3003
Quiescent Current ILED
27°C
10µs AFTER
ILED1,3 ILED2
JUNCTION TEMPERATURE (°C)
3003
3003
VMAX Current Temperature
VMAX CURRENT (nA) JUNCTION TEMPERATURE (°C) 10µs AFTER SHUTDOWN CURRENT (µA)
Shutdown Current Temperature
SHDN 1150 1100 (VLED1,2,3 VEE) (mV) 1050 1000
(VLED1,2,3 VEE) ILED
JUNCTION TEMPERATURE (°C)
ILED (mA)
3003
3003
3003
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LT3003 TYPICAL PERFORMANCE CHARACTERISTICS
Quiescent Current ILED
QUIESCENT CURRENT (mA) SHUTDOWN CURRENT (µA) ILED (mA)
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25°C unless otherwise noted.
Shutdown Current
3003
SHDN
FUNCTIONS
LED1 (Pin Controlled current input string LEDs with cathode lead connected pin. Connect first string LEDs this pin. LED2 (Pin Controlled current input string LEDs with cathode lead connected pin. Connect second string LEDs this pin. LED3 (Pin Controlled current input string LEDs with cathode lead connected pin. Connect third string LEDs this pin. VMAX (Pin Boost: Connect VOUT Buck Mode: Connect Input Supply Buck-Boost Mode: Connect VOUT (Pin Input Supply, Upper Rail. This must locally bypassed with capacitor ground. powers internal control circuitry. Boost: Connect Input Supply Buck Mode: Connect Input Supply Buck-Boost Mode: Connect VOUT (Pin Input Dimming Control. signal above 0.5V threshold) turns LT3003 channels signal below 0.5V completely disconnects each string. application does require dimming, then left either open internal 10µA source current pulls high) connected supply between 0.5V 15V. (Pin Overtemperature Output. pulls 100µA from when junction temperature exceeds 125°C. part cool down flag reset; ideal providing overtemperature flag system microprocessor. (Pin Overtemperature Output. Pulls 300µA from when junction temperature exceeds 125°C. part cool down flag reset; ideal connecting switching regulator error amplifier output defeat switching. SHDN (Pin Micropower Shutdown Pin. Below 0.7V shuts down Typically IVIN SHDN Boost: Connect System Shutdown Signal Buck Mode: Connect System Shutdown Signal Buck-Boost Mode: dimming, connect (Pin dimming, connect system shutdown signal
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LT3003 FUNCTIONS
(Pin 10): Lower Rail. Boost: Connect System Ground Buck Mode: Connect Inductor Buck-Boost Mode: Connect Input Supply Exposed (Pin 11): GND. ground should soldered continuous copper ground plane under LT3003 die. Soldering Exposed copper ground plane under device will reduce thermal resistance increase power capability LT3003.
BLOCK DIAGRAM
LED1 VMAX LED2 LED3
LOGIC
0.5V
BIAS THERMAL SHUTDOWN 125°C 150°C 0.7V
SHDN
EXPOSED
3003
Figure Block Diagram
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LT3003 OPERATION
LT3003 easy-to-use 3-channel ballaster. allows three strings LEDs driven parallel with accurate current matching. also provided allowing currents turned very duty cycles very wide dimming ranges. reliable system thermal management, output flags, OT2, provided indicate when junction temperature exceeds 125°C. Block Diagram Figure best illustrates features LT3003. LT3003 internal bias circuitry turned when SHDN 0.7V. current active each channel, must exceed 0.5V. VMAX should connected highest supply application (see various application modes boost, buck, buck-boost Typical Applications section). LT3003 ballasting feature achieved using current monitored LED2 channel control current channels LED1 LED3. servo loop exists each channel LED1 LED3 that compares current each channel LED2 reference channel. current LED2 channel determined current programmed partner driver. Details current programmed partner covered Typical Applications section using various drivers. Maximum fault current each LT3003 pins internally limited 550mA. string experiences open-circuit fault, string currents turned off. LT3003 unique level-shifting circuitry allow simple logic-level signal turn each current regardless voltage. This allows very simple dimming control current without need external level-shifting components buck mode buck-boost mode applications. Care taken ensure current (nano amps) VMAX pins 10µs after edge. This feature minimizes leakage currents each application maximize dimming ratio. Details dimming critical parameters given Applications Information section Dimming. LT3003 incorporates internal junction temperature sensing provides open-collector outputs, OT2, which become active when junction temperature exceeds 125°C. sized pull 100µA used input microprocessor system thermal management. sized pull 300µA defeat switching most LTC's drivers pulling down error amplifier output. LT3003 forced "zero current state" special internal protection circuit when junction temperature reaches 150°C. calculate LT3003 junction temperature, Thermal Calculations Applications Information section.
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LT3003 APPLICATIONS INFORMATION
Input Capacitor Selection LT3003 typically driven from same input voltage used partner driver driver inductor govern requirements input capacitor application. ceramic input capacitor range 10µF works most applications. cases where LT3003 input voltage derived separately from driver, input capacitor works well. Current Matching driver programs current LT3003 actively ballasts three separate strings LEDs. currents three channels will matched better than ±3%. achieve best current matching, (VIN VEE) should between 10V. (VIN VEE) also minimizes LT3003 internal power dissipation (see Thermal Calculation section more information).
ILED2 350mA VLED 1.4V
Dimming LT3003 wide dimming range constant color dimming. dimming superior analog dimming preserves true color quality. dimming control with LT3003 achieved using simple ground referenced signal with 0.5V on/off threshold. LEDs operate either programmed zero current their brightness changes with signal duty cycle. When low, strings completely disconnected. addition, LT3003 switches power standby mode ~10µs after edge, resulting higher system power efficiency. widest dimming range, signal should 100Hz. human typically sensitive flickering below ~80Hz. Operating higher than 100Hz results reduced dimming ratio. Achieving high dimming ratios require attention circuit leakages, such reverse bias leakage currents through external Schottky. Hence, high dimming ratios, components should chosen minimize leakage currents. application does require dimming, left open (unconnected) internal 10µA source current pulls high. Boost Dimming
ILED1,3 ILED2
3003
Figure ILED Matching (VIN VEE)
LT3003 supports 3000:1 dimming ratio with 100Hz dimming frequency. achieve such high ratios, leakages driver other external components should minimal. Buck Mode: Dimming LT3003 supports 3000:1 dimming ratio buck mode. dimming buck mode achieved architecture that allows LT3003 power ground (VEE) move with output capacitor voltage. dimming control achieved simple ground referenced signal, eliminating need external levelshift component. High dimming ratios require very VMAX currents during state. LT3003
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Current Range steady-state operational current range each between 100mA 350mA. Internal protection circuitry limits absolute maximum current 550mA. Open-Circuit Protection string open, then currents three channels reduce zero. driver chip, which supplies current, should have overvoltage clamp protect LT3003 from high voltages.
LT3003 APPLICATIONS INFORMATION
RSENSE
uses novel circuit techniques reduce VMAX currents nano range ~10µs after edge. This preserves output capacitor voltage results higher dimming ratios. Buck-Boost Mode: Dimming LT3003 also perform dimming buck-boost mode. buck-boost configuration requires SHDN pins tied together. This configuration support 2000:1 dimming ratio.
DRIVER
LED1 SHDN
LED2
LED3
VMAX
3003
LT3003
VMAX LT3003 LED3
LED2 LED1
Figure Boost Mode
RSENSE LED1 LED2 LED3 LT3003 VMAX SHDN
RSENSE
SHDN
DRIVER
3003
Figure Buck-Boost Mode
Overtemperature Protection
3003
DRIVER
Figure Buck Mode
LT3003 incorporates internal junction temperature sensing provides open-collector outputs, OT2, which become active when junction temperature exceeds 125°C. active output sink 100µA current connected system microprocessor. active output sink 300µA current connected switching regulator's error amplifier output defeat switching. LT3003 cool down (119°C) outputs reset (collector outputs high).
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LT3003 APPLICATIONS INFORMATION
addition, LT3003 internal 150°C overtemperature protection circuitry that resets chip zero current mode. This prevents chip from continuous operation high temperature. Thermal Calculations maximize output power capability application without exceeding LT3003 125°C maximum operational junction temperature, useful able calculate power dissipation within power dissipation within LT3003 comes from four main sources: switch loss, switch loss VLED mismatch input quiescent current. Switch Loss: PSW(DC) ILED VLED (See (VLED1,2,3 VEE) ILED Typical Performance Characteristics graph.) Switch Loss VLED Mismatch: PSW(VLED) Total VLED mismatch ILED Input Quiescent Loss: (VIN VEE) 1mA) ILED Example ILED 350mA/string; 350mA 29.25mA
Total VLED mismatch e.g., string voltage drop string voltage drop 5.7V; string voltage drop 5.3V Total VLED mismatch 5.7V) 5.3V) VLED 1.1V ILED 350mA (see (VLED VEE) ILED Typical Performance Characteristics graph). PSW(DC) 350mA (1.1V) 1.16W PSW(LED) 1000mV 350mA 350mW (29.25 1)mA 88mW PTOT 1.1W 350mW 88mW 1.6W LT3003 uses thermally enhanced 10-lead package. With proper soldering Exposed underside package, combined with full copper plane underneath device, thermal resistance (JA) about 35°C/W. ambient temperature 25°C, junction temperature LT3003, example application described above, calculated PTOT 25°C 35°C/W 1.6W 81°C Minimizing LT3003 Internal Power Dissipation LT3003 requires least headroom between VEE. Hence, systems with high system input voltage (such running multiple series LEDs Buck Mode), beneficial lower level voltage (LT3003 upper rail) with external zener reduce power dissipation chip. Therefore, recommended limit (VIN VEE) less than 10V. achieve best performance, (VIN VEE) should equal
Total Power Dissipation: PTOT PSW(DC) PSW(VLED) LT3003 Junction Temperature: (LT3003) JA(PTOT); JA(PTOT) PTOT 35°C/W
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LT3003 TYPICAL APPLICATIONS
1.05A Buck Mode LT3003 with LT3476
PVIN
4.7µF VMAX SHDN 0.33µF 10µH
SHDN VADJ1 CAP1 LED1
LED1
LED2
LT3003
LT3476 PWM1 19-21, 30-32
LEDs STRING; 350mA STRING
LED3
3003 TA02a
C1608X7R1C105K TAIYO YUDEN GMK212BJ334MG-T DIODES INC. DFLS140 TOKO A916CY-100M-P3 LED: LUMILEDS LUXEON
Efficiency
PVIN NUMBER LEDS 1000 TOTAL CURRENT (mA) 1200
EFFICIENCY
3003 TA02b
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LT3003 TYPICAL APPLICATIONS
330mA Boost LT3003 with LT3477
4.7µH 1.15M 45.3k 4.7µF VOUT
ISP1 ISN1 IADJ1 IADJ2 SHDN LT3477
ISP2
1N4148W 2N7002 22nF
VREF
ISN2
6.81k
ILED 110mA STRING LEDs STRING
0.033µF LED1 LED2 LED3 VMAX VOUT LT3003
TAIYO YUDEN TMK212BJ105MG-BR MURATA GRM32ER71H475KA88L DIODES INC. DFLS140 SUMIDA CDRH5D16-4R7
SHDN
3003 TA03a
Dimming
1000 ILED 110mA STRING NUMBER LEDS TOTAL ILED (mA) EFFICIENCY
Efficiency
ILED 110mA STRING NUMBER LEDS
1000 DIMMING RATIO 10000
3003 TA03b
3003 TA03b
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LT3003 TYPICAL APPLICATIONS
300mA Buck-Boost Mode LT3003 with LT3477
VMAX LED1 LED9 LED10 LED11 LED12 LT3003 LED2 LED5 LED6 LED7 LED8 LED3 SHDN LED1 LED2 LED3 LED4 ILED 100mA 10µH 33µF RSENSE 0.33 280k 3.3µF
ISP1 ISN1 IADJ1 IADJ2 SHDN LT3477
VREF ISP2 ISN2
33nF 100Hz
NMOS 10nF
6.81k
3003 TA04a
ZETEX ZLLS1000 DIODES 1N4148 PHILIPS PDZ9.1B NMOS: ZETEX 2N7002
Efficiency
ILED 100mA NUMBER LEDS
EFFICIENCY
ILED 200mA
3003 TA04b
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LT3003 TYPICAL APPLICATIONS
Buck Mode LT3003 with LT1618
4.7µF RSENSE 0.05
ILED 333mA STRING
LED1 VMAX SHDN SHDN IADJ LT1618
LED2
LED3
LT3003
COUT
10µH 1.5A
ZLLS1000
1N4148W 2N7002 220pF 10nF
3003 TA05a
100Hz, 500:1 DIMMING RATIO
Efficiency
TOTAL CURRENT
3003 TA05b
NUMBER LEDS
EFFICIENCY
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LT3003 TYPICAL APPLICATIONS
Buck LT3003 with LT3475
CIN1 4.7µF COUT1 2.2µF LED7 LED8 LED9 B240A 1N4448W 10µH SUMIDA SHDN PWM2 BOOST2 CHANNELS SHOWN
PWM1 BOOST1
0.22µF
OUT1
OUT2
LED1
LT3475
LED2
SECOND CHANNEL
LED4
LED5
LED6
LED1
LED2
LED3
2.0k
1.0k
VADJ1
VADJ2
330mA STRING LUXEON WHITE LED1 LED2 LED3 LT3003 VMAX SHDN PWM1 100Hz 2000:1 DIMMING RATIO
3300pF
0.1µF 1.0M 220pF
11.8k
3003 TA06a
1MHz
2N7002
Efficiency
EFFICIENCY TOTAL CURRENT
3003 TA06b
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LT3003 PACKAGE DESCRIPTION
Package 10-Lead Plastic MSOP
(Reference 05-08-1664)
BOTTOM VIEW EXPOSED OPTION
2.794 0.102 (.110 .004)
0.889 0.127 (.035 .005)
2.06 0.102 (.081 .004) 1.83 0.102 (.072 .004)
5.23 (.206)
2.083 0.102 3.20 3.45 (.082 .004) (.126 .136)
0.50 0.305 0.038 (.0197) (.0120 .0015) RECOMMENDED SOLDER LAYOUT
3.00 0.102 (.118 .004) (NOTE
0.497 0.076 (.0196 .003)
4.90 0.152 (.193 .006) 0.254 (.010) GAUGE PLANE 0.53 0.152 (.021 .006) DETAIL 0.18 (.007) SEATING PLANE 1.10 (.043) DETAIL
3.00 0.102 (.118 .004) (NOTE
0.86 (.034)
0.17 0.27 (.007 .011)
NOTE: DIMENSIONS MILLIMETER/(INCH) DRAWING SCALE DIMENSION DOES INCLUDE MOLD FLASH, PROTRUSIONS GATE BURRS. MOLD FLASH, PROTRUSIONS GATE BURRS SHALL EXCEED 0.152mm (.006") SIDE DIMENSION DOES INCLUDE INTERLEAD FLASH PROTRUSIONS. INTERLEAD FLASH PROTRUSIONS SHALL EXCEED 0.152mm (.006") SIDE LEAD COPLANARITY (BOTTOM LEADS AFTER FORMING) SHALL 0.102mm (.004")
0.50 (.0197)
0.127 0.076 (.005 .003)
MSOP (MSE) 0603
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Information furnished Linear Technology Corporation believed accurate reliable. However, responsibility assumed use. Linear Technology Corporation makes representation that interconnection circuits described herein will infringe existing patent rights.
LT3003 RELATED PARTS
PART NUMBER LT1618 LT1932 LT1942 DESCRIPTION DC/DC Converter Constant Current,1.2MHz, High Efficiency White Boost Regulator Quad DC/DC Converter Triple Output Supply Plus Boost Driver, with 2-Channel Ballaster 36V, 2MHz, Dual 1.5A Step-Down Driver 3.5mHz, Constant-Current DC/DC Converter with Dual Rail Sense. Drive LEDs Boost, Buck Buck-Boost Configurations 4.5A Constant Current BOOST Driver with 3.5MHz, Full Featured Boost/Inverter Converter with Soft-Start 36V, 2MHz, Step-Down Driver Multi-Display Controller, Step-Up/Step-Down Fractional Charge Pump, Independent Current Dimming Control Power Boost, Flyback SEPIC Controller COMMENTS Drives White LEDs from Li-Ion, 10-Lead Package VIN: 10V, VOUT(MAX) 34V, 1.2mA, 1µA, ThinSOTPackage Supply: Three Switching Regulators (Two Boost, Inverting) Supply: Strings LEDs. VIN: 2.6V 16V, VOUT(MAX) 45V, 7mA, 1µA, Profile package. VIN: 36V, 200kHz 2MHz, TSSOP20E Package, 3000:1 Dimming VIN: 2.5V 25V, VOUT(MAX) 42V, 1µA, QFN/TSSOP Packages
LT3475 LT3477
LT3478 LT3479 LT3474 LTC3205 LTC3783
VIN: 2.7V 36V, VOUT(MAX) 40V, ILED(MAX) 1.05A, 5µA, FE16 Package VIN: 2.5V 24V, VOUT(MAX) 40V, 5mA, 1µA, DFN/TSSOP Packages VIN: 36V, 200kHz 2MHz, TSSOP16E Package, 400:1 Dimming VIN: 2.8V 4.5V, 800MHz, Package VIN: 3.6V 36V, 300kHz, DFN, TSSOP16E Package, 3000:1 Dimming
ThinSOT trademark Linear Technology Corporation.
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Linear Technology Corporation
(408) 432-1900 FAX: (408) 434-0507
0107 PRINTED
1630 McCarthy Blvd., Milpitas, 95035-7417
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2006
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