LT3474/LT3474-1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
TOP VIEW
DNC*
OUT
LED
V
IN
SW
BOOST
BIAS
GND
1
2
3
4
5
6
7
8
17
16 DNC*
15 GND
14 PWM
13 V
ADJ
12 V
C
11 REF
10 SHDN
9
R
T
V
IN
Pin ........................................................(–0.3V), 36V
BIAS Pin....................................................................25V
BOOST Pin Voltage ...................................................51V
BOOST above SW Pin ...............................................25V
OUT, LED Pins (LT3474) ............................................15V
OUT, LED Pins (LT3474-1).........................................26V
PWM Pin ...................................................................10V
V
ADJ
Pin .....................................................................6V
,
V
C
, REF R
T
Pins ..........................................................3V
SHDN Pin ...................................................................V
IN
BIAS Pin Current .........................................................1A
Maximum Junction Temperature (Note 2)............. 125°C
Operating Temperature Range (Note 3)
LT3474E, LT3474E-1 ............................ –40°C to 85°C
LT3474I, LT3474I-1 ............................ –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
FE PACKAGE
16-LEAD PLASTIC TSSOP
θ
JC
= 8°C/W,
θ
JA
= 40°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
*DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS.
ORDER INFORMATION
LEAD FREE FINISH
LT3474EFE#PBF
LT3474IFE#PBF
LT3474EFE-1#PBF
LT3474IFE-1#PBF
TAPE AND REEL
LT3474EFE#TRPBF
LT3474IFE#TRPBF
LT3474EFE-1#TRPBF
LT3474IFE-1#TRPBF
PART MARKING
3474EFE
3474IFE
3474EFE-1
3474IFE-1
PACKAGE DESCRIPTION
16-Lead TSSOP
16-Lead TSSOP
16-Lead TSSOP
16-Lead TSSOP
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 125°C
–40°C to 85°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
PARAMETER
Minimum Input Voltage
Input Quiescent Current
Shutdown Current
LED Pin Current
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
BOOST
= 16V, V
OUT
= 4V unless otherwise noted (Note 3).
CONDITIONS
l
MIN
TYP
3.5
2.6
0.01
MAX
4
4
2
1.02
1.025
0.207
0.210
1.265
UNITS
V
mA
μA
A
A
A
A
V
Not Switching
SHDN = 0.3V, V
BOOST
= 0V, V
OUT
= 0V
V
ADJ
Tied to V
REF
V
ADJ
Tied to V
REF
/5
l
l
l
0.98
0.968
0.193
0.186
1.23
1
0.2
1.25
REF Voltage
3474fd
2
LINER [ LINEAR TECHNOLOGY ]
