Datasheet

LT3519/LT3519-1/LT3519-2
20
3519fa
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
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www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2009
LT 1109 REV A • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATIONS
SEPIC 150mA LED Driver
Waveforms for LED Shorted to Ground
Effi ciency vs V
IN
PART NUMBER DESCRIPTION COMMENTS
LT1618 Constant-Current, Constant-Voltage 1.24MHz, High
Effi ciency Boost Regulator
Up to 16 White LEDs, V
IN
: 1.6V to 18V, V
OUT(MAX)
= 34V, I
Q
= 1.8mA,
I
SD
< 1μA, MS Package
LT3466/LT3466-1 Dual Full Function, 2MHz Diodes White LED Step-Up
Converter with Built-In Schottkys
Up to 20 White LEDs, V
IN
: 2.7V to 24V, V
OUT(MAX)
= 39V, DFN/TSSOP-16
Packages
LT3486 Dual 1.3A White LED Converter with 1000:1 True Color
PWM Dimming
Drives Up to 16 100mA White LEDs. V
IN
: 2.5V to 24V, V
OUT(MAX)
= 36V,
DFN/TSSOP Packages
LT3491 2.3MHz White LED Driver with Integrated Schottky Diode Drives Up to 6 LEDs. V
IN
: 2.5V to 12V, V
OUT(MAX)
= 27V, SC70/DFN
Packages
LT3497 Dual Full Function 2.3MHz LED Driver with 250:1 True
Color PWM Dimming with Integrated Schottky Diodes
Drives Up to 12 LEDs. V
IN
: 2.5V to 10V, V
OUT(MAX)
= 32V, 3mm × 2mm
DFN Package
LT3517 Full-Featured LED Driver with 1.5A Switch Current 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
LT3518 Full-Featured LED Driver with 2.3A Switch Current 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
LT3591 Constant-Current, 1MHz, High Effi ciency White LED
Step-Up Converter with Built-in Schottkys
Up to 10 White LEDs, V
IN
: 2.5V to 12V, V
OUT(MAX)
= 45V, 3mm × 2mm DFN
Package
SW
V
IN
V
REF
CTRL
SHDN/UVLO
ISP
ISN
FB
OPENLED
ANODE
LT3519
GND
L1A
68μH
C3
2.2μF
1M
V
IN
4V TO 24V
432k
158k
100k
1M
1M
69.8k
M1
R
SENSE
1.65Ω
C2
4.7μF
C1
1μF
16V LED
150mA
CATHODE
PWM
PWM
3519 TA07a
•
L1B
68μH
•
C1: TDK C3216X7R1H105K
C2: TDK C3216X7R1E475K
C3: TDK C3216X7R1E225K
L1: COILTRONICS DRQ74-680-R (COUPLED INDUCTOR)
M1: VISHAY SILICONIX Si2318DS
NOTE:
V
IN
= 6V RISING TURN ON
V
IN
= 4V FALLING UVLO
V
IN
> 9V FULL LED CURRENT AND FOLDBACK BELOW
V
OUT
18.5V OVERVOLTAGE PROTECTION
V
OUT
5V
I
LED
0.1A/DIV
I
LED_SHORTED
0.5A/DIV
I
L1A
+I
L1B
0.2A/DIV
50μs/DIV
3519 TA07b
V
IN
= 12V
V
IN
(V)
4
84
86
88
20
3519 TA07c
82
80
81216 24
78
76
74
EFFICIENCY (%)