LT3479
20
3479fc
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2004
LT 0809 REV C • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER DESCRIPTION COMMENTS
LT1618 Constant Current, Constant Voltage 1.4MHz,
High Effi ciency Boost Regulator
V
IN
: 1.6V to 18V, V
OUT(MAX)
= 5.5V, I
Q
= 2.5mA, I
SD
= <1μA, QFN16 Package
LTC®3216 1A Low Noise High Current LED Charge Pump
with Independent Torch/Flash Current Control
V
IN
: 2.9V to 4.4V, V
OUT(MAX)
= 5.5V, I
Q
= 300μA, I
SD
= <1μA, DFN12 Package
LTC3436 3A (I
SW
), 1MHz, 34V Step-Up DC/DC Converter V
IN
: 3V to 25V, V
OUT(MAX)
= 34V, I
Q
= 0.9mA, I
SD
= <6μA, TSSOP16E Package
LTC3453 Synchronous Buck-Boost High Power White
LED Driver
V
IN
: 2.7V to 5.5V, V
OUT(MAX)
= 5.5V, I
Q
= 2.5mA, I
SD
= <1μA, QFN16 Package
LT3466 Dual Constant Current, 2MHz, High Effi ciency
White LED Boost Regulator with Integrated
Schottky Diode
V
IN
: 2.7V to 24V, V
OUT(MAX)
= 40V, I
Q
= 5mA, I
SD
= <16μA, DFN Package
115k
10k
2.49k
0.2Ω
I
LED
500mA/100mA
7.5k
10k
C1
2.2μF
V
IN
3.3V TO 4.2V
D1
D2
D3
M1
L1
4.7μH
3479 TA09
FBN
SWLV
S
V
IN
V
C
GNDR
T
V
REF
SHDNON
SS
LT3479
FBP
2.2nF
C1, C2: TAIYO YUDEN LMK316BJ225MD
D1: PHILIPS PMEG2010
D2, D3: LUMILEDS LXHL-PW01
L1: SUMIDA CDRH4D28-4R7
M1: VISHAY SILICONIX Si2302ADS
C2
2.2μF
ON
TORCH MODE
I
LED
= 100mA
FLASH MODE
I
LED
= 500mA
10nF
Lumiled Driver for Photo Flash with Output Disconnnect
0.2ms/DIV
V
OUT
1V/DIV
INDUCTOR
CURRENT
0.5A/DIV
3479 TA09b
Lumileds Start-Up
50μs/DIV
I
LED
0.2A/DIV
I
LED
500mA m100mA m500mA
V
OUT
AC-COUPLED
500mV/DIV
3479 TA09c
Lumileds Torch/Flash Transition
