LT3477EUF#TRPBF Linear Technology, LT3477EUF#TRPBF Datasheet - Page 20

• Manufacturer Part Number: LT3477EUF#TRPBF
• Description: IC LED DRVR HP CONST CURR 20-QFN
• Manufacturer: Linear Technology
• Type: High Power, Constant Currentr

Specifications of LT3477EUF#TRPBF

• Constant Current: Yes
• Constant Voltage: Yes
• Topology: Flyback, PWM, SEPIC, Step-Down (Buck), Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: General Purpose
• Type - Secondary: White LED
• Frequency: 200kHz ~ 3.5MHz
• Voltage - Supply: 2.5 V ~ 25 V
• Mounting Type: Surface Mount
• Package / Case: 20-QFN
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 3A
• Internal Switch(s): Yes
• Efficiency: 93%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -

3.3V
LT3477
TYPICAL APPLICATION
RELATED PARTS
PART NUMBER DESCRIPTION
LT1618
LT3436
LTC
LT3466
LT3479
LTC3490
20
V
IN
®
3453
C3
3.3μF
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
R
1k
SHDN
C
C
4.7nF
C1: NIPPON UNITED CHEMICON NTS40X5R1H225M
C2: TAIYO YUDEN GMK316BJ105ML
C3: TAIYO YUDEN LMK316BJ475
L1: TOKO A814AY-330M
D1: DIODES INC DFLS140
C
Buck Mode High Current LED Driver
Constant Current, Constant Voltage 1.4MHz,
High Effi ciency Boost Regulator
3A (I
Synchronous Buck-Boost High Power White
LED Driver
Dual Constant Current, 2MHz, High Effi ciency
White LED Boost Regulator With Integrated
Schottky Diode
3A, 42V Full Featured Boost/Inverter Converter
With Soft-Start
Single Cell 350mA, 1.3MHz LED Driver
SW
V
I
I
SHDN
V
V
ADJ1
ADJ2
IN
C
REF
I
SP1
), 800kHz, 34V Step-Up DC/DC Converter V
FBP
●
FAX: [phone]
PV
32V
I
LT3477
SN1
IN
GND
1A
LED1
LED4
SS
•
•
•
SW
I
FBN
I
LED
STRING C2
L1
33μH
SN2
R1
0.1Ω
SP2
C4
33nF
R
T
●
www.linear.com
D1
1μF
R2
22k
3477 TA07
R4
10k
R3
280k
C1
2.2μF
COMMENTS
V
V
V
V
V
IN
IN
IN
IN
IN
IN
: 1.6V to 18V, V
: 3V to 25V, V
: 2.7V to 5.5V, V
: 2.7V to 24V, V
: 2.5V to 24V, V
: 1V to 3.2V, V
OUT(MAX)
OUT(MAX)
OUT(MAX)
OUT(MAX)
OUT(MAX)
OUT(MAX)
100
60
40
20
90
80
70
50
30
0
= 34V, I
= 4.7V, I
= 5.5V, I
= 40V, I
= 40V, I
= 5.5V, I
0.2
Q
SD
= 0.9mA, I
Q
Q
Q
Q
= 5mA, I
= 5mA, I
= 2.5mA, I
< 1μA, DFN/SO8 Packages
LED CURRENT (A)
= 2.5mA, I
Effi ciency
0.4
© LINEAR TECHNOLOGY CORPORATION 2005
SD
SD
SD
0.6
SD
< 16μA, DFN Package
< 1μA, DFN/TSSOP Packages
< 6μA, TSSOP16E Package
SD
< 1μA, QFN16 Package
< 1μA, QFN16 Package
LT 0309 REV C • PRINTED IN USA
0.8
3477 TA05b
1
3477fc