LT3756/LT3756-1/LT3756-2
24
375612fb
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
LINEAR TECHNOLOGY CORPORATION 2008
LT 0310 REV B • PRINTED IN USA
relaTeD parTs
Typical applicaTion
Buck Mode 1A LED Driver with High Dimming Ratio and Open LED Reporting
Efficiency vs V
IN
PART NUMBER DESCRIPTION COMMENTS
LT3474 36V, 1A (I
LED
), 2MHz, Step-Down LED Driver V
IN
: 4V to 36V, V
OUT(MAX)
= 13.5V, True Color PWM Dimming = 400:1,
I
SD
< 1µA, TSSOP16E Package
LT3475 Dual 1.5A (I
LED
), 36V, 2MHz Step-Down LED Driver V
IN
: 4V to 36V, V
OUT(MAX)
= 13.5V, True Color PWM Dimming = 3000:1,
I
SD
< 1µA, TSSOP20E Package
LT3476 Quad Output 1.5A, 36V, 2MHz High Current LED Driver
with 1000:1 Dimming
V
IN
: 2.8V to 16V, V
OUT(MAX)
= 36V, True Color PWM Dimming = 1000:1,
I
SD
< 10µA, 5mm × 7mm QFN Package
LT3477 3A, 42V, 3MHz Boost, Buck-Boost, Buck LED Driver V
IN
: 2.5V to 25V, V
OUT(MAX)
= 40V, Dimming = Analog/PWM, I
SD
< 1µA,
QFN and TSSOP20E Packages
LT3478/LT3478-1 4.5A, 42V, 2.5MHz High Current LED Driver with
3000:1 Dimming
V
IN
: 2.8V to 36V, V
OUT(MAX)
= 42V, True Color PWM Dimming = 3000:1,
I
SD
< 3µA, TSSOP16E Package
LT3486 Dual 1.3A, 2MHz High Current LED Driver V
IN
: 2.5V to 24V, V
OUT(MAX)
= 36V, True Color PWM Dimming = 1000:1,
I
SD
< 1µA, 5mm × 3mm DFN and TSSOP16E Packages
LT3496 Triple 0.75A, 2.1MHz, 45V LED Driver V
IN
: 3V to 30V, V
OUT(MAX)
= 45V, Dimming = 3000:1, I
SD
< 1µA,
4mm × 5mm QFN and TSSOP16E Packages
LT3517 1.5A, 2.5MHz, 45V LED Driver V
IN
: 3V to 30V, V
OUT(MAX)
= 45V, Dimming = 3000:1, I
SD
< 1µA,
4mm × 4mm QFN and TSSOP16E Packages
LT3518 2.3A, 2.5MHz, 45V LED Driver V
IN
: 3V to 30V, V
OUT(MAX)
= 45V, Dimming = 3000:1, I
SD
< 1µA,
4mm × 4mm QFN and TSSOP16E Packages
LT3755/LT3755-1/
LT3755-2
40V
IN
, 75V
OUT
, Full Featured LED Controller V
IN
: 4.5V to 40V, V
OUT(MAX)
= 75V, True Color PWM Dimming = 3000:1,
I
SD
< 1µA, 3mm × 3mm QFN-16 and MS16E Packages
LTC
®
3783 High Current LED Controller V
IN
: 3V to 36V, V
OUT(MAX)
= Ext FET, True Color PWM Dimming = 3000:1,
I
SD
< 20µA, 5mm × 4mm QFN10 and TSSOP16E Packages
V
IN
LT3756-2
GNDVC INTV
CC
SHDN/UVLO
FB
V
REF
V
IN
INTV
CC
ISP
0.001µF
0.1µF
V
IN
24V TO
80V
28.7k
375kHz
47k
100k
C2
4.7µF
CTRL
0.033Ω
0.1Ω
M1
C3
4.7µF
s5
25V
C4
4.7µF
L1
33µH
D1
1A
375612 TA05a
OPENLED
PWM
SS
RT
ISN
GATE
PWMOUT
SENSE
1M
61.9k
M1: VISHAY SILICONIX Si3430DV
D1: DIODES INC B1100/B
L1: WÜRTH 74456133
M2: VISHAY SILICONIX Si5435BDC
Q1: ZETEX FMMT493
Q2: ZETEX FMMT593
C1
1µF
s2
200k
20k
5 WHITE LEDs
20W
200k 200k
1k
1.5k
Q1
Q2
M2
V
IN
(V)
20
80
EFFICIENCY (%)
84
88
92
96
100
40
60
375612 TA05b
80
30
50 70
PWM Dimming Waveforms
10µs/DIV
0A
I
LED
1A
V
SW
50V/DIV
V
PWM
375612 TA05c
