LT3474/LT3474-1
20
3474fd
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2005
LT 1008 REV D • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER DESCRIPTION COMMENTS
LT1618 Constant Current, 1.4MHz, 1.5A Boost Converter V
IN
: 1.6V to 18V, V
OUT(MAX)
= 36V, I
Q
= 1.8mA, I
SD
= <1μA,
MS10 Package
LT1766 60V, 1.2A (I
OUT
), 200kHz, High Effi ciency Step-Down DC/DC Converter V
IN
: 5.5V to 60V, V
OUT(MAX)
= 1.20V, I
Q
= 2.5mA, I
SD
= 25μA,
TSSOP16/E Packages
LT1956 60V, 1.2A (I
OUT
), 500kHz, High Effi ciency Step-Down DC/DC Converter V
IN
: 5.5V to 60V, V
OUT(MAX)
= 1.20V, I
Q
= 2.5mA, I
SD
= 25μA,
TSSOP16/E Packages
LT1961 1.5A (I
SW
), 1.25MHz, High Effi ciency Step-Up DC/DC Converter V
IN
: 3V to 25V, V
OUT(MAX)
= 35V, I
Q
= 0.9mA, I
SD
= 6μA,
MS8E Package
LT1976/LT1977 60V, 1.2A (I
OUT
), 200kHz/500kHz, High Effi ciency Step-Down
DC/DC Converters with BurstMode
®
Operation
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 Effi 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 Effi ciency Step-Up/Step-Down
DC/DC Converters with Burst Mode Operation
V
IN
: 4V to 60V, V
OUT
: 3.3V to 20V, I
Q
= 100μA,
I
SD
= <1μA, TSSOP16E Package
LT3434/LT3435 60V, 2.5A (I
OUT
), 200kHz/500kHz, High Effi ciency Step-Down
DC/DC Converters with Burst Mode Operation
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 Effi 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.
V
IN
BIAS
OUT
LED
PWM
LT3474-1
C4
0.1μF
V
IN
21V TO
36V
C2
2.2μF
25V
R2
10k
R3
100k
1A LED
CURRENT
f
SW
= 500kHz
12V TO 18V
LED VOLTAGE
C3
0.22μF
16V
D1
D3
Q1
D2
L1
47μH
3474 TA02a
R1
80.6k
SHDN
REF
BOOST
SW
V
ADJ
R
T
V
C
GND
C1
2.2μF
50V
D1: MBRM 140
D2: 7.5V Zener Diode
D3: 22V Zener Diode
Q1: MMBT3904
C1 TO C3: X5R OR X7R
Step-Down 1A LED Driver with Four Series Connected LED Output
