LT3478/LT3478-1
24
34781f
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2007
LT 0107 • PRINTED IN USA
TYPICAL APPLICATIO
U
RELATED PARTS
LT3478
SHDN
V
REF
OUT
LED
CTRL2
CTRL1
OVPSET
PWM SS V
C
R
T
V
IN
V
S
LSW
C2
3.3µF
25V
C3
3.3µF
10V
R1
8.25k
R
SENSE
0.42Ω
R
T
10k
f
OSC
= 2MHz
100Hz
R2
10k
PWM
DIMMING RATIO = 1000:1
L1: CDRH6D28
D1: ZLLS1000
Q1: Si2318DS
LEDs: LUXEON I (WHITE)
250mA
D1
3478 TA05a
L1
10µH
V
IN
3.3V
3.3V
0V
V
S
8V TO 16V
C1
4.7µF
25V
C
C
0.1µF
C
SS
1µF
R3
10k
Q1
V
S
(V)
8
EFFICIENCY (%)
100
95
90
85
80
75
70
60
65
3478 TA05b
12 161410
V
IN
= 3.3V
I
LED
= 250mA
f
OSC
= 2MHz
PWM DUTY CYCLE = 100%
6 LEDs = LUXEON I (WHITE)
6W, 6 LEDs at 250mA, Boost LED Driver
Effi ciency vs Input V
S
PART NUMBER DESCRIPTION COMMENTS
LT1618 Constant Current, 1.4MHz, 1.5A Boost Converter with Analog/PWM
Dimming
V
IN
: 5V to 18V, V
OUT(MAX)
= 36V, I
SD
<1µA, MS10 Package
LT3003 Three Channel LED Ballaster with 3,000:1 True Color PWM Dimming V
IN
: 3V to 48V, I
SD
<5µA, MSOP10 Package
LT3474 36V, 1A (I
LED
), 2MHz,Step-Down LED Driver with 400:1 True Color
PWM Dimming
V
IN
: 4V to 36V, V
OUT(MAX)
= 13.5V, I
SD
<1µA, TSSOP16E Package
LT3475 Dual 1.5A(I
LED
), 36V, 2MHz,Step-Down LED Driver 3,000:1 True
Color PWM Dimming
V
IN
: 4V to 36V, V
OUT(MAX)
= 13.5V, I
SD
<1µA, TSSOP20E Package
LT3476 Quad Output 1.5A, 2MHz High Current LED Driver with 1,000:1 True
Color PWM Dimming
V
IN
: 2.8V to 16V, V
OUT(MAX)
= 36V, I
SD
<10µA, 5mm × 7mm QFN
Package
LT3477 42V, 3A, 3.5MHz Boost, Buck-Boost, Buck LED Driver with Analog/
PWM Dimming
V
IN
: 2.5V to 25V, V
OUT(MAX)
= 40V, I
SD
<1µA, QFN, TSSOP20E
Packages
LT3479 3A, 3.5MHz Full Featured DC/DC Converter with Soft-Start and
Inrush Current Protection and Analog/PWM Dimming
V
IN
: 2.5V to 24V, V
OUT(MAX)
= 40V, I
SD
<1µA, 4mm × 3mm DFN,
TSSOP16E Packages
LT3486 Dual 1.3A , 2MHz High Current LED Driver with 1,000:1 True Color
PWM Dimming
V
IN
: 2.5V to 24V, V
OUT(MAX)
= 36V, I
SD
<1µA, 5mm × 3mm DFN,
TSSOP16E Packages
LTC3783 High Current LED Controller with 3,000:1 True Color PWM Dimming V
IN
: 3V to 36V, V
OUT(MAX)
= Ext FET, I
SD
<20µA, 5mm × 4mm
DFN, TSSOP16E Packages
