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LT3474/LT3474-1
TYPICAL APPLICATION
Step-Down 1A LED Driver with Four Series Connected LED Output
V IN
21V TO
36V
C1
2.2μF
50V
V IN
SHDN
BOOST
SW
C3
0.22μF
16V
L1
47μH
R T
REF
LT3474-1
BIAS
OUT
D2
D1
R1
80.6k
C4
V ADJ
V C
PWM
LED
C2
2.2μF
25V
R2
10k
0.1μF
GND
D3
12V TO 18V
LED VOLTAGE
1A LED
R3
100k
Q1
CURRENT
f SW = 500kHz
3474 TA02a
D1: MBRM 140
D2: 7.5V Zener Diode
D3: 22V Zener Diode
Q1: MMBT3904
C1 TO C3: X5R OR X7R
RELATED PARTS
PART NUMBER
LT1618
LT1766
LT1956
LT1961
LT1976/LT1977
DESCRIPTION
Constant Current, 1.4MHz, 1.5A Boost Converter
60V, 1.2A (I OUT ), 200kHz, High Ef ?ciency Step-Down DC/DC Converter
60V, 1.2A (I OUT ), 500kHz, High Ef ?ciency Step-Down DC/DC Converter
1.5A (I SW ), 1.25MHz, High Ef ?ciency Step-Up DC/DC Converter
60V, 1.2A (I OUT ), 200kHz/500kHz, High Ef ?ciency Step-Down
DC/DC Converters with BurstMode ? Operation
COMMENTS
V IN : 1.6V to 18V, V OUT(MAX) = 36V, I Q = 1.8mA, I SD = <1μA,
MS10 Package
V IN : 5.5V to 60V, V OUT(MAX) = 1.20V, I Q = 2.5mA, I SD = 25μA,
TSSOP16/E Packages
V IN : 5.5V to 60V, V OUT(MAX) = 1.20V, I Q = 2.5mA, I SD = 25μA,
TSSOP16/E Packages
V IN : 3V to 25V, V OUT(MAX) = 35V, I Q = 0.9mA, I SD = 6μA,
MS8E Package
V IN : 3.3V to 60V, V OUT(MAX) = 1.20V, I Q = 100μA, I SD = <1μA,
TSSOP16E Package
LT3430/LT3431
60V, 2.5A (I OUT ), 200kHz, High Ef ?ciency Step-Down DC/DC Converters V IN : 5.5V to 60V, V OUT(MAX) = 1.20V, I Q = 2.5μA,
I SD = <25μA, TSSOP16/E Packages
LT3433
60V, 400mA (I OUT ), 200kHz, High Ef ?ciency Step-Up/Step-Down
V IN : 4V to 60V, V OUT : 3.3V to 20V, I Q = 100μA,
DC/DC Converters with Burst Mode Operation
LT3434/LT3435 60V, 2.5A (I OUT ), 200kHz/500kHz, High Ef ?ciency Step-Down
DC/DC Converters with Burst Mode Operation
I SD = <1μA, TSSOP16E Package
V IN : 3.3V to 60V, V OUT(MAX) = 1.20V, I Q = 100μA, I SD = <1μA,
TSSOP16E Package
LTC3453
1MHz, 800mA Synchronous Buck-Boost High Power LED Driver
V IN : 2.7V to 5.5V, V OUT(MAX) = 5.5V, I Q = 2.5mA, I SD = <6μA,
QFN Package
LT3467/LT3467A 1.1A (I SW ), 1.3MHz/2.1MHz, High Ef ?ciency Step-Up DC/DC Converters
with Integrated Soft-Start
V IN : 2.4V to 16V, V OUT(MAX) = 40V, I Q = 1.2mA, I SD = <1μA,
ThinSOT ? Package
LT3477
3A, 42V, 3MHz Step-Up Regulator with Dual Rail to Rail Current Sense V IN : 2.5V to 2.5V, V OUT(MAX) = 40V, I Q = 5mA, I SD = <1μA,
QFN, TSSOP16E Packages
LT3479
3A, Full Featured DC/DC Converter with Soft-Start and Inrush
Current Protection
V IN : 2.5V to 24V, V OUT(MAX) = 40V, I Q = 6.5mA, I SD = <1μA,
DFN and TSSOP Packages
Burst Mode is a registered trademark of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
3474fd
20 Linear Technology Corporation
(408) 432-1900 ● FAX: (408) 434-0507 www.linear.com
1630  McCarthy  Blvd.,  Milpitas,  CA  95035-7417
●
LT 1008 REV D ? PRINTED IN USA
? LINEAR TECHNOLOGY CORPORATION 2005
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