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Manufacturer or author: Provided By www.digicamel.com(FREE DATASHEET DOWNLOAD SITE)
PDF pages: 16

Technical content

FEATURES

APPLICATIONS

DESCRIPTION

8 × 3 = 24 LEDs 350mA PER STRING VMAX SHDN VIN PWM LED2 LT3003 LED3 0.1Ω VEEGND OT2OT1 CAP 10µH1nF 10µF 0.33µFLED VIN VIN 3V TO 16V VC

3003 TA01a

1µF 1µF PVIN 32V GND SIMPLIFIED LT3476 SW PWM PWM DIMMING TOTAL LED CURRENT (mA) EFFICIENCY (%) 200 400 600 800

3003 TA01b

PVIN = 32V NUMBER OF LEDS = 8 × 3 = 24 3-Channel LED Ballaster with PWM The LT®3003 drives three separate strings of LEDs up to 350mA/channel with 3% accurate current matching, resulting in uniform LED brightness and intensity. This approach is superior to conventional methods of running three separate channels with external ballast resistors requiring expensive factory calibration. The LT3003 operates in boost, buck and buck-boost mode. A True Color PWM Dimming ratio of up to 3000:1 is achiev- able using a logic-level signal at the PWM pin for all modes without the need for external level-shifting circuitry. For applications with input supply above and below the output voltage of the LED strings, the LT3003 allows the LEDs to be returned to the input supply (buck-boost mode) instead of being limited to only SEPIC solutions. The LT3003 is ideal for high power LED driver applications such as TFT LCD backlighting and heads-up displays. Ad- ditional overtemperature outputs allow appropriate system management for increased reliability. The LT3003 is available in a small 10-pin MSE package. ■ High Power LED Ballaster ■ Automotive Lighting ■ Video Cameras ■ TFT LCD Backlighting ■ 3% LED Current Matching ■ Up to 350mA Continuous Current per LED String ■ Up to 3000:1 True Color PWMTM Dimming Range ■ PWM Input Disconnects LED Strings ■ Can Operate in Buck, Boost and Buck-Boost Modes ■ Wide Input Range: 3V to 40V ■ Overtemperature Outputs ■ Works with LT1618, LT3477, LT3474, LT3475, LT3476, LTC®3783 ■ Thermally Enhanced 10-Pin MSOP Package , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. True Color PWM is a trademark of Linear Technolology Corporation. All other trademarks are the property of their respective owners. Buck Mode LT3003 with the LT3476 Efﬁ ciency

ELECTRICAL CHARACTERISTICS

PACKAGE/ORDER INFORMATIONABSOLUTE MAXIMUM RATINGS Operating Junction Temperature Range (Note 1) The ● denotes the speciﬁ cations which apply over the full operating temperature range, otherwise speciﬁ cations are at TA = 25°C. PWM = 1V, VMAX = 4V, VIN = 3V, VEE = 0V, ILED2 = 100mA, OT1 = OT2 = Open, SHDN = VIN. PARAMETER CONDITIONS MIN TYP MAX UNITS VIN Operational Input Voltage V EE = 0V, ILED1,2,3 = 100mA VEE = 4V, ILED1,2,3 = 100mA

33 6 V V Minimum (VIN – VEE)V EE = 0V to 36V 2.7 3 V VIN Quiescent Current PWM = 1V, I LED1,2,3 = 100mA PWM = 0V, VLED1 = VLED2 = VLED3 10.5 470 600 mA µA VIN Shutdown Current SHDN = 0V, I LED1,2,3 = 0mA 2 4 10 µA VMAX Quiescent Current PWM = 1V, I LED2 = 100mA PWM = 0V, VLED1 = VLED2 = VLED3 300 µA nA SHDN Pin Threshold I LED2 = 100mA, VLED1 = VLED2 = VLED3 ● 0.25 0.7 1 V LED Current Matching I LED2 = 350mA, VLED1 = VLED2 = VLED3 –3 0 +3 % |LED2 – LED1|, |LED2 – LED3| LED Current Matching with LED Pin Voltage Mismatch I LED2 = 350mA, (|VLED2 – VLED1| + |VLED2 – VLED3|) = 700mV –3.5 0.5 +3.5 % LED Pin Voltage I LED2 = 100mA 0.7 0.8 0.9 V LED1, LED2, LED3 Maximum Current V LED1,2,3 < 1.5V 375 500 550 mA LED1, LED2, LED3 Maximum Leakage Current PWM = 0V, V LED1,2,3 = 48V 0.1 1 µA PWM Switching Threshold I LED1,2,3 = 100mA ● 0.3 0.5 0.7 V Turn-On Delay (PWM On to ILED On) PWM = 0V to 1V, I LED > 50mA 2 µs VEE Pin Current in Buck Mode PWM = 0V, V MAX = 40V, VIN = 39V, VEE = 36V 0.1 1 µA Overtemperature Sense Point (OT1, OT2) (Note 4) 125 °C Overtemperature Hysteresis Point (Note 5) –6° from Overtemp Sense Point OT1 Pull-Down Current OT1 = 0.3V (Note 4) 100 µA LED1 LED2 LED3 V MAX VIN V EE SHDN OT2 OT1 PWM TOP VIEW MSE PACKAGE 10-LEAD PLASTIC MSOP TJMAX = 125°C, θJA = 35°C/W EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB ORDER PART NUMBER MSE PART MARKING LT3003EMSE LTCFF Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ Consult LTC Marketing for parts speciﬁ ed with wider operating temperature ranges.

TYPICAL PERFORMANCE CHARACTERISTICS PARAMETER CONDITIONS MIN TYP MAX UNITS OT2 Pull-Down Current OT2 = 0.3V (Note 4) 300 µA OT1, OT2 Leakage Current OT1 = OT2 = 5V 1 µA Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LT3003E is guaranteed to meet performance speciﬁ cations from 0°C to 85°C junction temperature. Speciﬁ cations over the –40°C to 125°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125°C when overtemperature protection is active. Continuous operation above the speciﬁ ed maximum operating junction temperature may impair device reliability. Note 4: Correlation to static test at T A = 25°C. Note 5: Guaranteed by design. ILED1,3 to ILED2 Matching ILED (mA) 200 300

3003 G02

INPUT QUIESCENT CURRENT (mA) TJ = 27°C JUNCTION TEMPERATURE (°C) –50 VEE PIN CURRENT –1 (nA) 150 200 250 500 350 0 50 75

3003 G03

–25 25 100 125 10µs AFTER PWM = 0 VIN Quiescent Current vs ILED VEE Pin Current (Out of the Pin) vs Temperature VMAX Pin Current vs Temperature VIN Shutdown Current vs Temperature (V LED1,2,3 – VEE) vs ILED JUNCTION TEMPERATURE (°C) –50 VMAX PIN CURRENT (nA) 0 50 75

3003 G04

–25 25 100 125 10µs AFTER PWM = 0 JUNCTION TEMPERATURE (°C) –50 25 75

3003 G05

–25 0 50 100 125 VIN SHUTDOWN CURRENT (µA) SHDN = 0 JUNCTION TEMPERATURE (°C) –50 ILED1,3 vs ILED2 (%)

3003 G01

2.0 1.0 –25 0 50 0.5 3.0 2.5 1.5 75 100 125 ILED1,3 – ILED2 ILED2 ILED2 = 350mA VLED1 = VLED2 = VLED3 ILED (mA) (VLED1,2,3 – VEE) (mV) 1000 1050 1100 300

3003 G06

The ● denotes the speciﬁ cations which apply over the full operating temperature range, otherwise speciﬁ cations are at TA = 25°C. PWM = 1V, VMAX = 4V, VIN = 3V, VEE = 0V, ILED2 = 100mA, OT1 = OT2 = Open, SHDN = VIN. TA = 25°C unless otherwise noted.

TYPICAL PERFORMANCE CHARACTERISTICS LED1 (Pin 1): Controlled current input for a string of LEDs with a cathode lead connected to the pin. Connect the ﬁ rst string of LEDs to this pin. LED2 (Pin 2): Controlled current input for a string of LEDs with a cathode lead connected to the pin. Connect the sec- ond string of LEDs to this pin. LED3 (Pin 3): Controlled current input for a string of LEDs with a cathode lead connected to the pin. Connect the third string of LEDs to this pin. VMAX (Pin 4):

Boost: Connect to V OUT
Buck Mode: Connect to Input Supply
Buck-Boost Mode: Connect to V OUT VIN (Pin 5): Input Supply, Upper Rail. This pin must be locally bypassed with a capacitor to ground. V IN powers the internal control circuitry.
Boost: Connect to Input Supply
Buck Mode: Connect to Input Supply
Buck-Boost Mode: Connect to V OUT PWM (Pin 6): Input Pin for PWM Dimming Control. A PWM signal above 0.5V (on threshold) turns the LT3003 channels on. A PWM signal below 0.5V completely discon- nects each LED string. If the application does not require PWM dimming, then the PWM pin can be left either open (an internal 10µA source current pulls PWM high) or it can be connected to a supply between 0.5V to 15V. OT1 (Pin 7): Overtemperature Output. OT1 pulls 100µA from the pin when the junction temperature exceeds 125°C. The part has to cool down by 6°C for the ﬂ ag to reset; ideal for providing an overtemperature ﬂ ag to the system microprocessor. OT2 (Pin 8): Overtemperature Output. OT2 Pulls 300µA from the pin when the junction temperature exceeds 125°C. The part has to cool down by 6°C for the ﬂ ag to reset; ideal for connecting to the switching regulator g m error ampliﬁ er output to defeat switching. SHDN (Pin 9): Micropower Shutdown Pin. Below 0.7V shuts down the IC. Typically IVIN = 4µA for SHDN = 0V.
Boost: Connect to System Shutdown Signal or VIN
Buck Mode: Connect to System Shutdown Signal or VIN
Buck-Boost Mode: If PWM dimming, connect to PWM (Pin 6); if no PWM dimming, connect to system shut- down signal or VIN VIN Quiescent Current vs ILED VIN Shutdown Current vs VIN ILED (mA) 200 300

3003 G07

VIN QUIESCENT CURRENT (mA) VIN (V) VIN SHUTDOWN CURRENT (µA)

3003 G08

SHDN = 0 TA = 25°C unless otherwise noted.

Figure 1. Block Diagram

3003 F01

Boost: Connect to System Ground
Buck Mode: Connect to Inductor
Buck-Boost Mode: Connect to Input Supply Exposed Pad (Pin 11): GND. The ground for the IC should be soldered to a continuous copper ground plane under the LT3003 die. Soldering the Exposed Pad to the copper ground plane under the device will reduce thermal resis- tance and increase the power capability of the LT3003. PIN FUNCTIONS

The LT3003 is an easy-to-use 3-channel LED ballaster. It allows three strings of LEDs to be driven in parallel with accurate LED current matching. A PWM pin is also provided allowing LED currents to be turned on and off at very low duty cycles for very wide LED dimming ranges. For reliable system thermal management, two output ﬂ ags, OT1 and OT2, are provided to indicate when the junction temperature exceeds 125°C. The Block Diagram in Figure 1 best illustrates the features of LT3003. The LT3003 internal bias circuitry is turned on when V IN > 3V and SHDN > 0.7V. For LED current to be active in each channel, the PWM pin must exceed 0.5V. V MAX should be connected to the highest supply in the application (see various application modes of boost, buck, buck-boost in the Typical Applications section). The LT3003 ballasting feature is achieved by using the current monitored in the LED2 channel to control the current in channels LED1 and LED3. A servo loop exists for each channel LED1 and LED3 that compares the cur- rent in each channel to the LED2 reference channel. The current in LED2 channel is determined by the LED current programmed by the partner LED driver. Details of how LED current can be programmed by the partner IC are covered in the Typical Applications section using various ICs as LED drivers. Maximum fault current in each of the LT3003 LED pins is internally limited to 550mA. If any LED string experiences an open-circuit fault, all LED string currents are turned off. The LT3003 PWM pin has unique level-shifting circuitry to allow a simple logic-level PWM signal to turn each LED pin current on and off regardless of the V EE pin voltage. This allows very simple PWM dimming control of LED current without any need for external level-shifting components in buck mode and buck-boost mode applications. Care is taken to ensure low current (nano amps) in the V EE and VMAX pins 10µs after PWM low edge. This feature mini- mizes leakage currents in each application to maximize PWM dimming ratio. Details of PWM dimming and criti- cal parameters are given in the Applications Information section PWM Dimming. The LT3003 incorporates internal junction temperature sensing and provides two open-collector outputs, OT1 and OT2, which become active low when junction tem- perature exceeds 125°C. OT1 is sized to pull 100µA and can be used as an input to the microprocessor for system thermal management. OT2 is sized to pull 300µA to defeat switching for most of LTC’s LED drivers by pulling down the g m error ampliﬁ er output. LT3003 is forced to a “zero LED current state” by a special internal protection circuit when junction temperature reaches 150°C. To calculate the LT3003 junction temperature, see Thermal Calculations in the Applications Information section. OPERATION

LED driver, a 1µF input capacitor works well. in all three channels will be matched to better than ±3%. tion section for more information). their brightness changes with the PWM signal duty cycle. higher system power efﬁ ciency. in a reduced PWM dimming ratio. source current pulls PWM high. external components should be minimal.

3003 F02

Figure 2. ILED Matching vs (VIN – VEE) limits absolute maximum pin current to 550mA. LT3003 from high LED pin voltages.

currents to nano amp range ~10µs after PWM low edge. in higher PWM dimming ratios. support up to a 2000:1 PWM dimming ratio.

3003 F03

Figure 3. Boost Mode

3003 F04

Figure 4. Buck Mode

3003 F05

Figure 5. Buck-Boost Mode current and can be connected to system microprocessor. reset (collector outputs high).

In addition, LT3003 has an internal 150°C overtemperature protection circuitry that resets the chip to zero LED current mode. This prevents the chip from continuous operation at high temperature. Thermal Calculations To maximize output power capability in an application without exceeding the LT3003 125°C maximum operational junction temperature, it is useful to be able to calculate power dissipation within the IC. The power dissipation within the LT3003 comes from four main sources: switch DC loss, switch loss due to LED V LED mismatch and input quiescent current. 1. Switch DC Loss: P SW(DC) = ILED • VLED • 3 (See (V LED1,2,3 – V EE) vs I LED Typical Performance Characteristics graph.) 2. Switch Loss due to VLED Mismatch: P SW(ΔVLED) = Total VLED mismatch • ILED 3. Input Quiescent Loss: P Q = (VIN – VEE) • (IQ – 1mA) + 1mA • VIN I I mAQ LED=+3 40 3 4. Total Power Dissipation: P TOT = PSW(DC) + PSW(ΔVLED) + PQ 5. LT3003 Junction Temperature: T J (LT3003) = TA + θJA(PTOT); θJA(PTOT) = PTOT • 35°C/W Example V IN = 3V; VEE = 0V; ILED = 350mA/string;

I mA mA mAQ =+ =3 350 40 32 9 2 5 . Total VLED mismatch = 1V:
e.g., LED string 1 voltage drop = 6V; LED string 2 voltage drop = 5.7V; LED string 3 voltage drop = 5.3V
Total VLED mismatch = (6V – 5.7V) + (6V – 5.3V) = 1V VLED = 1.1V at I LED = 350mA (see (V LED – VEE) vs I LED Typical Performance Characteristics graph). 2. PSW(LED) = 1000mV • 350mA = 350mW 4. PTOT = 1.1W + 350mW + 88mW ≈1.6W The LT3003 uses a thermally enhanced 10-lead MSE package. With proper soldering of the Exposed Pad to the underside of the package, combined with a full copper plane underneath the device, the thermal resistance (θ JA) is about 35°C/W. For an ambient temperature of TA = 25°C, the junction temperature of the LT3003, for the example application described above, can be calculated as: 5. T J = T A + θJA • PTOT = 25°C + 35°C/W • 1.6W = 81°C Minimizing LT3003 Internal Power Dissipation The LT3003 requires at least 3V headroom between V IN and VEE. Hence, for systems with high system input volt- age and low V EE (such as running multiple series LEDs in a Buck Mode), it is beneﬁ cial to lower the level of VIN pin voltage (LT3003 upper rail) with an external zener to reduce power dissipation in the chip. Therefore, it is recom- mended to limit (V IN – VEE) to less than 10V. To achieve best performance, (VIN – VEE) should equal 3V. APPLICATIONS INFORMATION

1.05A Buck Mode LT3003 with the LT3476 LED LED LED LEDR1 0.1Ω LED LED 0.33µF 1nF 1µF 21k 4.7µF 35V 1µF PVIN 32V VIN 3V TO 16V 10µH 20V

3003 TA02a

8 LEDs PER STRING;

C1: TDK C1608X7R1C105K C2: TAIYO YUDEN GMK212BJ334MG-T D1: DIODES INC. DFLS140 L1: TOKO A916CY-100M-P3 LED: LUMILEDS LUXEON SHDN V EE PWM CAP1 VINSHDN LT3476 GND NC 18 33 LED1 REF VADJ1 35PWM1 29SW1RT SW1 1VC1 19-21, 30-32 TOTAL LED CURRENT (mA) EFFICIENCY (%) 200 400 600 800

3003 TA02b

PVIN = 33V NUMBER OF LEDS = 8 × 3 = 24 Efﬁ ciency TYPICAL APPLICATIONS

330mA Boost LT3003 with the LT3477 LT3003 VIN VIN 1µF 25V

3003 TA03a

V MAXPWM 13 14 16 17 32 1 VOUT LED1 LED2 LED3 VEEGND SHDN OT1 OT2 FBN ISP2 42115 PWM 6.81k ISN2FBP VREF RTVC 1N4148W SHDN LT3477 ISP1 ISN1 SW SW GNDGND SS NC NC NC V IN IADJ1 IADJ2 0.3Ω 1.15M 4.7µH V IN 8V TO 16V 45.3k 0.033µF 4.7µF 50V V OUT 22nF C1, C3: TAIYO YUDEN TMK212BJ105MG-BR C4: MURATA GRM32ER71H475KA88L D1: DIODES INC. DFLS140 L1: SUMIDA CDRH5D16-4R7 2N7002 1µF 25V PWM DIMMING RATIO TOTAL ILED (mA) 100 10000

3003 TA03b

0.1 10 100 1000 1000 ILED = 110mA PER STRING NUMBER OF LEDS = 8 × 3 = 24 VIN (V) EFFICIENCY (%) 100 10 12 13 ILED = 110mA PER STRING NUMBER OF LEDS = 8 × 3 = 24 PWM Dimming Efﬁ ciency TYPICAL APPLICATIONS

300mA Buck-Boost Mode LT3003 with the LT3477 LT3003 VIN 1 697 8 VMAX PWM LED1 LED1 LED2 LED3 VEE GND SHDN OT1OT2 LED2 LED3 ILED = 100mA LED4 LED5 LED6 LED7 LED8 LED9 LED10 LED11 LED12 FBN SHDN SS V C LT3477 ISP1 ISN1 SW GND FBP VREF ISP2 ISN2 RT VIN IADJ1 IADJ2 10µH RSENSE 0.33Ω 3.3µF 50V CER D1: ZETEX ZLLS1000 D2: DIODES INC 1N4148 D3: PHILIPS PDZ9.1B NMOS: ZETEX 2N7002 NMOS PWM

3003 TA04a

V IN 8V TO 16V 33µF CER 1µF 100Hz 6.81k Efﬁ ciency VIN (V) EFFICIENCY (%) 8 10 12 14

3003 TA04b

ILED = 200mA ILED = 100mA NUMBER OF LEDS = 4 × 3 = 12 TYPICAL APPLICATIONS

1A Buck Mode LT3003 with the LT1618 Efﬁ ciency LT3003 LED2 LED3LED1 14V VIN 1µF 50V 10µH 1.5A PWM 100Hz, 5V 500:1 MAX PWM DIMMING RATIO C OUT 1µF 50V CER 220pF GND PWM VMAX ILED = 333mA PER STRING VEE VIN SHDN OT1 OT2 4.7µF 50V CER 10nF

3003 TA05a

0.05Ω 1%, 1A ISN LT1618 ISP VIN SHDN SW 2N7002 VC IADJ GND FB NC 1µF 10V CER VIN 32V TOTAL LED CURRENT (A) EFFICIENCY (%) 0.2 0.4 0.6 0.8

3003 TA05b

1.0 NUMBER OF LEDS = 6 × 3 = 18 TYPICAL APPLICATIONS

1A Buck LT3003 with the LT3475 Efﬁ ciency LT3003 GND 20V LED1 LED2 LED3 V MAX VIN VEE SHDN OT2 OT1 PWM PWM1 100Hz 2000:1 MAX PWM DIMMING RATIO LED1 LED4 LED7 LED2 330mA PER STRING 3S 3P LUXEON I WHITE LED5 LED8 LED3 LED6 LED9 1µF 50V VIN 56 1 6 1120 20k VIN SHDN PWM1 PWM2 BOOST1 OUT1

17 REF

0.22µF X5R 1.0k 10µH SUMIDA BOOST2 OUT2 SW2 GND GNDR T LT3475 LED2 SECOND CHANNEL ONE OF TWO CHANNELS SHOWN 2.0k 1219 V ADJ1 VADJ2 R10 10k R12 11.8k R13 1.0M 220pF 2N7002 0.1µF 3300pF COUT1 2.2µF 16V CIN1 4.7µF 50V 15 14 21 fSW = 1MHz

3003 TA06a

18 VC1 VC2

TOTAL LED CURRENT (A) EFFICIENCY (%) 0.2 0.4 0.6 0.8

3003 TA06b

1.0 100 1.2 TYPICAL APPLICATIONS

Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 10-Lead Plastic MSOP (Reference LTC DWG # 05-08-1664) MSOP (MSE) 0603 0.53 ± 0.152 (.021 ± .006) SEATING PLANE 0.18 (.007) 1.10 (.043) MAX 0.17 – 0.27 (.007 – .011) TYP 0.86 (.034) REF 0.50 (.0197) BSC 12 3 45 4.90 ± 0.152 (.193 ± .006) 0.497 ± 0.076 (.0196 ± .003) REF8910 7 6 3.00 ± 0.102 (.118 ± .004) (NOTE 3) 3.00 ± 0.102 (.118 ± .004) (NOTE 4) NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX 0.254 (.010) 0° – 6° TYP DETAIL “A” DETAIL “A” GAUGE PLANE 5.23 (.206) MIN 3.20 – 3.45 (.126 – .136) 0.889 ± 0.127 (.035 ± .005) RECOMMENDED SOLDER PAD LAYOUT 0.305 ± 0.038 (.0120 ± .0015) TYP 2.083 ± 0.102 (.082 ± .004) 2.794 ± 0.102 (.110 ± .004) 0.50 (.0197) BSC BOTTOM VIEW OF EXPOSED PAD OPTION 1.83 ± 0.102 (.072 ± .004) 2.06 ± 0.102 (.081 ± .004) 0.127 ± 0.076 (.005 ± .003) PACKAGE DESCRIPTION

Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2006 LT 0107 REV A PRINTED IN USA PART NUMBER DESCRIPTION COMMENTS LT1618 Constant-Current/Constant-Voltage DC/DC Converter Drives 20 White LEDs from Li-Ion, 10-Lead MS Package LT1932 Constant Current,1.2MHz, High Efﬁ ciency White LED Boost Regulator V IN: 1V to 10V, VOUT(MAX) = 34V, IQ = 1.2mA, ISD < 1µA, ThinSOTTM Package LT1942 Quad DC/DC Converter for Triple Output TFT Supply Plus Boost LED Driver, with a 2-Channel Ballaster TFT Supply: Three Switching Regulators (Two Boost, One Inverting) LED Supply: Up to Two Strings of 10 LEDs. VIN: 2.6V to 16V, VOUT(MAX) = 45V, IQ = 7mA, ISD < 1µA, Low Proﬁ le QFN package. LT3475 36V, 2MHz, Dual 1.5A Step-Down LED Driver V IN: 4V to 36V, 200kHz to 2MHz, TSSOP20E Package, 3000:1 Dimming LT3477 3A, 3.5mHz, Constant-Current DC/DC Converter with Dual Rail Sense. Can Drive LEDs in Boost, Buck and Buck-Boost Conﬁ gurations V IN: 2.5V to 25V, VOUT(MAX) = 42V, ISD < 1µA, QFN/TSSOP Packages LT3478 4.5A Constant Current BOOST LED Driver with PWM V IN: 2.7V to 36V, VOUT(MAX) = 40V, ILED(MAX) = 1.05A, ISD < 5µA, LT3479 3A, 3.5MHz, 42V Full Featured Boost/Inverter Converter with Soft-Start VIN: 2.5V to 24V, VOUT(MAX) = 40V, IQ = 5mA, ISD < 1µA, DFN/TSSOP Packages LT3474 36V, 2MHz, Step-Down 1A LED Driver V IN: 4V to 36V, 200kHz to 2MHz, TSSOP16E Package, 400:1 Dimming LTC3205 Multi-Display LED Controller, Step-Up/Step-Down Fractional Charge Pump, Independent Current and Dimming Control VIN: 2.8V to 4.5V, 800MHz, QFN Package LTC3783 PWM LED Power and Boost, Flyback and SEPIC Controller V IN: 3.6V to 36V, 300kHz, DFN, TSSOP16E Package, 3000:1 Dimming ThinSOT is a trademark of Linear Technology Corporation. RELATED PARTS

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Linear Technology LT3003 overview.

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Summary

3-Channel LED Ballaster with PWM

Description

3-Channel LED Ballaster with PWM

Source title LT3003 Datasheet(PDF) - Linear Technology

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