lt3479efe-trpbf Linear Technology Corporation, lt3479efe-trpbf Datasheet - Page 16

• Manufacturer Part Number: lt3479efe-trpbf
• Description: 3a, Full Featured Dc/dc Converter With Soft-start And Inrush Current Protection
• Manufacturer: Linear Technology Corporation

TYPICAL APPLICATIO
LT3479
RELATED PARTS
PART NUMBER
LT1618
LTC
LTC3436
LTC3453
LT3466
16
®
3216
INDUCTOR
CURRENT
0.5A/DIV
1V/DIV
V
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
OUT
DESCRIPTION
Constant Current, Constant Voltage 1.4MHz,
High Efficiency Boost Regulator
1A Low Noise High Current LED Charge Pump
with Independent Torch/Flash Current Control
3A (I
Synchronous Buck-Boost High Power White
LED Driver
Dual Constant Current, 2MHz, High Efficiency
White LED Boost Regulator with Integrated
Schottky Diode
SW
●
), 1MHz, 34V Step-Up DC/DC Converter
Lumileds Start-Up
FAX: [phone]
3.3V TO 4.2V
0.2ms/DIV
V
IN
U
Lumiled Driver for Photo Flash with Output Disconnnect
●
C1
2.2µF
www.linear.com
ON
C1, C2: TAIYO YUDEN LMK316BJ225MD
D1: PHILIPS PMEG2010
D2, D3: LUMILEDS LXHL-PW01
L1: SUMIDA CDRH4D28-4R7
M1: VISHAY SILICONIX Si2302ADS
3479 TA04b
10nF
V
SHDN
SS
IN
R
T
V
7.5k
S
LT3479
L
GND
4.7µH
L1
COMMENTS
V
V
V
V
V
IN
IN
IN
IN
IN
: 1.6V to 18V, V
: 2.9V to 4.4V, V
: 3V to 25V, V
: 2.7V to 5.5V, V
: 2.7V to 24V, V
SW
V
FBN
V
FBP
REF
C
10k
2.2nF
AC-COUPLED
500mV/DIV
0.2A/DIV
D1
V
OUT(MAX)
115k
10k
I
OUT
LED
OUT(MAX)
OUT(MAX)
OUT(MAX)
OUT(MAX)
I
LED
0.2Ω
2.49k
500mA → 100mA → 500mA
D2
D3
= 34V, I
M1
Lumileds Torch/Flash Transition
= 40V, I
= 5.5V, I
FLASH MODE
I
= 5.5V, I
= 5.5V, I
LED
= 500mA
I
500mA/100mA
Q
LED
TORCH MODE
I
= 0.9mA, I
Q
LED
ON
Q
Q
Q
= 5mA, I
= 2.5mA, I
= 300µA, I
= 2.5mA, I
= 100mA
50µs/DIV
C2
2.2µF
3479 TA09
© LINEAR TECHNOLOGY CORPORATION 2004
SD
SD
LT/LT 0605 REV A• PRINTED IN THE USA
SD
SD
= <6µA, TSSOP16E Package
= <16µA, DFN Package
SD
= <1µA, QFN16 Package
= <1µA, DFN12 Package
= <1µA, QFN16 Package
3479 TA04c
3479fa