LT3477EUF#TRPBF Linear Technology, LT3477EUF#TRPBF Datasheet - Page 2

• 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: -

ABSOLUTE MAXIMUM RATINGS
LT3477
SW Pin Voltage ........................................................ 42V
V
FBP, FBN Pin Voltage ................................................. 6V
V
R
I
I
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
PARAMETER
Minimum Input Voltage
Quiescent Current
Reference Voltage
Reference Voltage Line Regulation
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH
LT3477EFE#PBF
LT3477IFE#PBF
LT3477EUF#PBF
LT3477IUF#PBF
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to:
For more information on tape and reel specifi cations, go to:
2
ADJ1
SP1
IN
REF
T
, V
, SHDN Pin Voltage ............................................. 25V
, I
C
, I
Pin Voltage......................................................... 6V
SP2
, SS Pin Voltage ............................................... 6V
ADJ2
, I
EXPOSED PAD (PIN 21) IS PGND (MUST BE SOLDERED TO PCB)
SN1
Pin Voltage ............................................ 25V
, I
SN2
Pin Voltage ...............................42V
T
SHDN
I
I
V
JMAX
ADJ2
ADJ1
FBN
FBP
TAPE AND REEL
LT3477EFE#TRPBF
LT3477IFE#TRPBF
LT3477EUF#TRPBF
LT3477IUF#TRPBF
V
REF
SS
R
V
IN
T
C
20-LEAD PLASTIC TSSOP
10
= 125°C, θ
1
2
3
4
5
6
7
8
9
FE PACKAGE
TOP VIEW
21
JA
= 40°C/W
20
19
18
17
16
15
14
13
12
11
NC
NC
NC
SW
SW
GND
I
I
I
I
SN1
SP1
SN2
SP2
CONDITIONS
V
V
E Grade
I Grade
2.5V < V
SHDN
SHDN
http://www.linear.com/leadfree/
PART MARKING
3477
3477
= 0V
= 2.5V, V
IN
A
http://www.linear.com/tapeandreel/
= 25°C. V
< 25V, V
The
C
= 0.3V (Not Switching)
C
●
= 0.3V
(Note 1)
IN
indicates specifi cations which apply over the full operating
= 2.5V, V
Junction Temperature .......................................... 125°C
Operating Temperature Range (Note 2)
Storage Temperature Range ...................– 65°C to 125°C
Lead Temperature (Soldering, 10 sec)
LT3477E ...............................................– 40°C to 85°C
LT3477I .............................................. –40°C to 125°C
TSSOP .............................................................. 300°C
PACKAGE DESCRIPTION
20-Lead Plastic TSSOP
20-Lead Plastic TSSOP
20-Lead (4mm × 4mm) Plastic QFN
20-Lead (4mm × 4mm) Plastic QFN
SHDN
EXPOSED PAD (PIN 21) IS PGND (MUST BE SOLDERED TO PCB)
= 2.5V.
SHDN
V
NC
NC
R
IN
T
T
20-LEAD (4mm × 4mm) PLASTIC QFN
JMAX
1
2
3
4
5
l
l
l
= 125°C, θ
20 19 18 17 16
6
UF PACKAGE
TOP VIEW
7
21
1.216
1.210
8
MIN
JA
9 10
= 37°C/W
15
14
13
12
11
1.235
1.235
TYP
0.01
2.3
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 125°C
–40°C to 85°C
–40°C to 125°C
0.1
5.0
I
I
I
I
I
SP1
SN2
SP2
ADJ1
ADJ2
1.250
1.260
MAX
0.03
2.5
1.0
7.5
UNITS
3477fc
%/V
mA
μA
V
V
V