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LT3475/LT3475-1
TYPICAL APPLICATION
Dual Step-Down 1.5A LED Driver with Four Series Connected LED Output
V IN
21V TO 36V
C1
D1
D2
4.7μF
50V
V IN
SHDN
D3
D4
L1
33μH
C2
0.22μF
16V
BOOST1
LT3475-1
BOOST2
C3
0.22μF
16V
L2
33μH
R1
1k
D5
SW1
OUT1
LED1
SW2
OUT2
LED2
D6
R2
1k
R4
12V TO 18V LED VOLTAGE
12V TO 18V LED VOLTAGE
R5
10k
V C1
V C2
10k
D7
C4
2.2μF
25V
C6
0.1μF
REF
R T
C7
0.1μF
C5
2.2μF
25V
D8
V ADJ1
V ADJ2
R3
Q1
R6
100k
1.5A LED
CURRENT*
GND
24.3k
1.5A LED
CURRENT*
R7
100k
Q2
f SW = 600kHz
3475 TA08
D1, D4: 7.5V ZENER DIODE
D2, D3: MMSD4148
D5, D6: B240A
D7, D8: 22V ZENER DIODE
R1, R2: USE 0.5W RESISTOR OF TWO 2k 0.25W RESISTORS IN PARALLEL
Q1, Q2: MMBT3904
C1 TO C5: X5R or X7R
*DERATE LED CURRENT AT ELEVATED AMBIENT TEMPERATURES TO MAINTAIN LT3475-1 JUNCTION TEMPERATURE BELOW 125 °C.
RELATED PARTS
PART NUMBER
LT1618
LT3466
LT3474
LT3477
LT3479
DESCRIPTION
Constant-Current, 1.4MHz, 1.5A Boost
Converter
Dual Full Function Step-Up LED Driver
36V, 1A (I LED ), 2MHz Step-Down
LED Driver
42V, 3A, 3.5MHz Boost, Buck-Boost,
Buck LED Driver
3A, Full-Featured DC/DC Converter with
COMMENTS
V IN(MIN) = 1.6V, V IN(MAX) = 18V, V OUT(MAX) = 35V, Analog/PWM, I SD < 1μA,
MS10 Package
Drivers Up to 20 LEDs, V IN : 2.7V to 24V, V OUT(MAX) = 40V, DFN, TSSOP16E Packages
V IN(MIN) = 4V, V IN(MAX) = 36V, 400:1 True Color PWM, I SD < 1μA,
TSSOP16E Package
V IN(MIN) = 2.5V, V IN(MAX) = 25V, V OUT(MAX) = 40V, Analog/PWM, I SD < 1μA,
QFN, TSSOP20E Packages
V IN(MIN) = 2.5V, V IN(MAX) = 24V, V OUT(MAX) = 40V, Analog/PWM, I SD < 1μA,
Soft-Start and Inrush Current Protection DFN, TSSOP Packages
LT3846
Dual 1.3A, 2MHz, LED Driver
V IN : 2.5V to 24V, V OUT(MAX) = 36V, 1000:1 True Color PWM TM Dimmin,
DFN, TSSOP16E Packages
3475fb
(408) 432-1900 ● FAX: (408) 434-0507 www.linear.com
20
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
●
LT 1007 REV B ? PRINTED IN USA
? LINEAR TECHNOLOGY CORPORATION 2006
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