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