LT3475IFE-PBF データシートの表示（PDF） - Linear Technology
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LT3475IFE-PBF Datasheet PDF : 20 Pages
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LT3475/LT3475-1
TYPICAL APPLICATION
Dual Step-Down 1.5A LED Driver with Four Series Connected LED Output
VIN
21V TO 36V
D1 D2
C1
4.7μF
50V
L1
33μH
R1
1k
C2
0.22μF
16V
D5
VIN
BOOST1
SHDN
BOOST2
LT3475-1
SW1
SW2
C3
0.22μF
16V
D6
D3 D4
L2
33μH
R2
1k
R4
10k
D7
C4
2.2μF
25V
Q1 R6
100k
12V TO 18V LED VOLTAGE
OUT1
LED1
OUT2
LED2
12V TO 18V LED VOLTAGE
C6
0.1μF
1.5A LED
CURRENT*
VC1
REF
VADJ1
GND
VC2
RT
VADJ2
R3
24.3k
C7
0.1μF
1.5A LED
CURRENT*
R5
10k
C5
D8
2.2μF
25V
R7 Q2
100k
fSW = 600kHz
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.
3475 TA08
RELATED PARTS
PART NUMBER
LT1618
LT3466
LT3474
LT3477
LT3479
LT3846
DESCRIPTION
COMMENTS
Constant-Current, 1.4MHz, 1.5A Boost VIN(MIN) = 1.6V, VIN(MAX) = 18V, VOUT(MAX) = 35V, Analog/PWM, ISD < 1μA,
Converter
MS10 Package
Dual Full Function Step-Up LED Driver
36V, 1A (ILED), 2MHz Step-Down
LED Driver
Drivers Up to 20 LEDs, VIN: 2.7V to 24V, VOUT(MAX) = 40V, DFN, TSSOP16E Packages
VIN(MIN) = 4V, VIN(MAX) = 36V, 400:1 True Color PWM, ISD < 1μA,
TSSOP16E Package
42V, 3A, 3.5MHz Boost, Buck-Boost,
Buck LED Driver
VIN(MIN) = 2.5V, VIN(MAX) = 25V, VOUT(MAX) = 40V, Analog/PWM, ISD < 1μA,
QFN, TSSOP20E Packages
3A, Full-Featured DC/DC Converter with VIN(MIN) = 2.5V, VIN(MAX) = 24V, VOUT(MAX) = 40V, Analog/PWM, ISD < 1μA,
Soft-Start and Inrush Current Protection DFN, TSSOP Packages
Dual 1.3A, 2MHz, LED Driver
VIN: 2.5V to 24V, VOUT(MAX) = 36V, 1000:1 True Color PWMTM Dimmin,
DFN, TSSOP16E Packages
20 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
3475fb
LT 1007 REV B • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2006
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