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LT3519/LT3519-1/LT3519-2
TYPICAL APPLICATIONS
SEPIC 150mA LED Driver
L1A
68μH
C3
2.2μF
L1B
68μH
V IN
4V TO 24V
C1
?
?
1μF
1M
SW ANODE CATHODE
V IN ISP
V OUT
R SENSE
1.65Ω
C2
4.7μF
100k
SHDN /UVLO
ISN
C1: TDK C3216X7R1H105K
1M
158k
432k
V REF
CTRL
LT3519
FB
1M
69.8k
16V LED
150mA
C2: TDK C3216X7R1E475K
C3: TDK C3216X7R1E225K
L1: COILTRONICS DRQ74-680-R (COUPLED INDUCTOR)
M1: VISHAY SILICONIX Si2318DS
NOTE:
V IN = 6V RISING TURN ON
OPENLED
GND
Waveforms for LED Shorted to Ground
I L1A +I L1B
PWM
PWM
5V
M1
3519 TA07a
V IN = 4V FALLING UVLO
V IN > 9V FULL LED CURRENT AND FOLDBACK BELOW
V OUT 18.5V OVERVOLTAGE PROTECTION
Ef?ciency vs V IN
88
86
0.2A/DIV
84
I LED
0.1A/DIV
I LED_SHORTED
0.5A/DIV
82
80
78
V IN = 12V
50μs/DIV
3519 TA07b
76
74
4
8
12
16
20
24
V IN (V)
3519 TA07c
RELATED PARTS
PART NUMBER
LT1618
DESCRIPTION
Constant-Current, Constant-Voltage 1.24MHz, High
COMMENTS
Up to 16 White LEDs, V IN : 1.6V to 18V, V OUT(MAX) = 34V, I Q = 1.8mA,
Ef?ciency Boost Regulator
LT3466/LT3466-1 Dual Full Function, 2MHz Diodes White LED Step-Up
Converter with Built-In Schottkys
LT3486 Dual 1.3A White LED Converter with 1000:1 True Color
PWM Dimming
LT3491 2.3MHz White LED Driver with Integrated Schottky Diode
I SD < 1μA, MS Package
Up to 20 White LEDs, V IN : 2.7V to 24V, V OUT(MAX) = 39V, DFN/TSSOP-16
Packages
Drives Up to 16 100mA White LEDs. V IN : 2.5V to 24V, V OUT(MAX) = 36V,
DFN/TSSOP Packages
Drives Up to 6 LEDs. V IN : 2.5V to 12V, V OUT(MAX) = 27V, SC70/DFN
Packages
LT3497
LT3517
LT3518
LT3591
Dual Full Function 2.3MHz LED Driver with 250:1 True
Color PWM Dimming with Integrated Schottky Diodes
Full-Featured LED Driver with 1.5A Switch Current
Full-Featured LED Driver with 2.3A Switch Current
Constant-Current, 1MHz, High Ef?ciency White LED
Step-Up Converter with Built-in Schottkys
Drives Up to 12 LEDs. V IN : 2.5V to 10V, V OUT(MAX) = 32V, 3mm × 2mm
DFN Package
V IN : 3V to 40V, V OUT(MAX) = 45V, Dimming = 5.000:1 True Color PWM,
I SD < 1μA, 4mm × 4mm QFN and TSSOP Packages
V IN : 3V to 40V, V OUT(MAX) = 45V, Dimming = 3.000:1 True Color PWM,
I SD < 1μA, 4mm × 4mm QFN and TSSOP Packages
Up to 10 White LEDs, V IN : 2.5V to 12V, V OUT(MAX) = 45V, 3mm × 2mm DFN
Package
3519fa
20 Linear Technology Corporation
(408) 432-1900 ● FAX: (408) 434-0507 www.linear.com
1630  McCarthy  Blvd.,  Milpitas,  CA  95035-7417
●
LT 1109 REV A ? PRINTED IN USA
? LINEAR TECHNOLOGY CORPORATION 2009
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