Datasheet

LT3956
20
3956f
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
●
www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2010
LT 0510 • 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
LT3756/LT3756-1/
LT3756-2
100V
IN
, 100V
OUT
, Full Featured LED Controller V
IN
: 6V to 100V, V
OUT(MAX)
= 100V, True Color PWM Dimming = 3000:1,
I
SD
< 1µA, 3mm × 3mm QFN-16 and MS16E Packages
LT3755/LT3755-1/
LT3755-2
40V
IN
, 75V
OUT
, Full Featured LED Controller V
IN
: 4.5V to 40V, V
OUT(MAX)
= 60V, True Color PWM Dimming = 3000:1,
I
SD
< 1µA, 3mm × 3mm QFN-16 and MS16E Packages
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
V
IN
LT3956
GNDV
C
INTV
CC
EN/UVLO
FB
V
IN
INTV
CC
ISP
2.2nF
0.1µF
V
IN
24V TO
80V
28.7k
375kHz
47k
100k
4.7µF
0.1Ω
C2
4.7µF
s5
C1
1µF
s2
L1
33µH
D1
1A
3956 TA07a
VMODE
PWM
SS
RT
ISN
PWMOUT
PGND
SW
1M
61.9k
D1: DIODES INC B1100/B
L1: WÜRTH 74456133
M1: VISHAY SILICONIX Si5435BDC
Q1: ZETEX FMMT493
Q2: ZETEX FMMT593
C1: TDKC3226X7R2A105K
C2: TDKC3225X7RIE475K
200k
200k200k
20k
6 WHITE LEDs
20W
1k
750Ω
M1
INTV
CC
Q1
Q2
V
REF
CTRL
30.1k
10k
V
IN
(V)
20
80
EFFICIENCY (%)
84
88
92
96
100
40
60
3956 TA06b
80
30
50 70