Datasheet

LT3474/LT3474-1
2
3474fd
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
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
(Note 1)
FE PACKAGE
16-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
DNC*
OUT
LED
V
IN
SW
BOOST
BIAS
GND
DNC*
GND
PWM
V
ADJ
V
C
REF
SHDN
R
T
17
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 TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3474EFE#PBF LT3474EFE#TRPBF 3474EFE 16-Lead TSSOP –40°C to 85°C
LT3474IFE#PBF LT3474IFE#TRPBF 3474IFE 16-Lead TSSOP –40°C to 125°C
LT3474EFE-1#PBF LT3474EFE-1#TRPBF 3474EFE-1 16-Lead TSSOP –40°C to 85°C
LT3474IFE-1#PBF LT3474IFE-1#TRPBF 3474IFE-1 16-Lead TSSOP –40°C to 125°C
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:
http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to:
http://www.linear.com/tapeandreel/
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage
l
3.5 4 V
Input Quiescent Current Not Switching 2.6 4 mA
Shutdown Current SHDN = 0.3V, V
BOOST
= 0V, V
OUT
= 0V 0.01 2 μA
LED Pin Current V
ADJ
Tied to V
REF
V
ADJ
Tied to V
REF
/5
l
l
0.98
0.968
0.193
0.186
1
0.2
1.02
1.025
0.207
0.210
A
A
A
A
REF Voltage
l
1.23 1.25 1.265 V
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 12V, V
BOOST
= 16V, V
OUT
= 4V unless otherwise noted (Note 3).