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LT3475/LT3475-1
ABSOLUTE
AXI U RATI GS
PIN CONFIGURATION
(Note 1)
TOP VIEW
V IN Pin .........................................................(-0.3V), 40V
BOOST Pin Voltage ...................................................60V
BOOST Above SW Pin ...............................................30V
OUT, LED, Pins (LT3475) ...........................................15V
OUT1
LED1
BOOST1
SW1
1
2
3
4
20 PWM1
19 V ADJ1
18 V C1
17 REF
OUT, LED Pins (LT3475-1).........................................25V
PWM Pin ...................................................................15V
V ADJ Pin ......................................................................6V
V C , R T , REF Pins ..........................................................3V
V IN
V IN
SW2
BOOST2
LED2
5
6
7
8
9
21
16 SHDN
15 GND
14 R T
13 V C2
12 V ADJ2
SHDN Pin ...................................................................V IN
OUT2 10
11 PWM2
Maximum Junction Temperature (Note 2)............. 125°C
Operating Temperature Range (Note 3)
LT3475E/LT3475E-1 ............................. –40°C to 85°C
LT3475I/LT3475I-1 ............................. –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature Range (Soldering, 10 sec) ....... 300°C
ORDER INFORMATION
FE PACKAGE
20-LEAD PLASTIC TSSOP
T JMAX = 125°C, θ JA = 30°C/W, θ JC = 8°C/W
EXPOSED PAD (PIN 21) IS GROUND AND MUST
BE ELECTRICALLY CONNECTED TO THE PCB.
LEAD FREE FINISH
LT3475EFE#PBF
LT3475IFE#PBF
LT3475EFE-1#PBF
LT3475IFE-1#PBF
TAPE AND REEL
LT3475EFE#TRPBF
LT3475IFE#TRPBF
LT3475EFE-1#TRPBF
LT3475IFE-1#TRPBF
PART MARKING*
LT3475EFE
LT3475IFE
LT3475FE-1
LT3475FE-1
PACKAGE DESCRIPTION
20-Lead Plastic TSSOP
20-Lead Plastic TSSOP
20-Lead Plastic TSSOP
20-Lead Plastic 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 speci?ed with wider operating temperature ranges. *The temperature grade is identi?ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based ?nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel speci?cations, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS The ● denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C. V IN = 12V, V BOOST = 16V, V OUT = 4V unless otherwise noted (Note 3)
PARAMETER
Minimum Input Voltage
Input Quiescent Current
Shutdown Current
CONDITIONS
Not Switching
SHDN = 0.3V, V BOOST = V OUT = 0V
●
MIN
TYP
3.7
6
0.01
MAX
4
8
2
UNITS
V
mA
μA
3475fb
2
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