Datasheet

LT3475/LT3475-1
2
3475fb
V
IN
Pin .........................................................(-0.3V), 40V
BOOST Pin Voltage ...................................................60V
BOOST Above SW Pin ...............................................30V
OUT, LED, Pins (LT3475) ...........................................15V
OUT, LED Pins (LT3475-1) .........................................25V
PWM Pin ...................................................................15V
V
ADJ
Pin ......................................................................6V
V
C
, R
T
, REF Pins ..........................................................3V
SHDN Pin ...................................................................V
IN
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
(Note 1)
The
● 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)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage
●
3.7 4 V
Input Quiescent Current Not Switching 6 8 mA
Shutdown Current
SHDN = 0.3V, V
BOOST
= V
OUT
= 0V 0.01 2 μA
ELECTRICAL CHARACTERISTICS
ABSOLUTE AXI U RATI GS
W
WW
U
FE PACKAGE
20-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
9
10
TOP VIEW
20
19
18
17
16
15
14
13
12
11
OUT1
LED1
BOOST1
SW1
V
IN
V
IN
SW2
BOOST2
LED2
OUT2
PWM1
V
ADJ1
V
C1
REF
SHDN
GND
R
T
V
C2
V
ADJ2
PWM2
21
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 TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3475EFE#PBF LT3475EFE#TRPBF LT3475EFE 20-Lead Plastic TSSOP –40°C to 85°C
LT3475IFE#PBF LT3475IFE#TRPBF LT3475IFE 20-Lead Plastic TSSOP –40°C to 125°C
LT3475EFE-1#PBF LT3475EFE-1#TRPBF LT3475FE-1 20-Lead Plastic TSSOP –40°C to 85°C
LT3475IFE-1#PBF LT3475IFE-1#TRPBF LT3475FE-1 20-Lead Plastic TSSOP –40°C to 125°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
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/
PIN CONFIGURATION
ORDER INFORMATION