Datasheet
LT3745-1
2
37451f
ABSOLUTE MAXIMUM RATINGS
V
IN
.......................................................................... 57V
CAP
......................................................... V
IN
– 8V to V
IN
GATE ..............................................................CAP to V
IN
LED00 to LED15, ISP, ISN .........................................40V
ISP
.................................................ISN – 1V to ISN + 1V
FB, RT, T
SET
, I
SET
....................................................... 2V
V
CC
...............................................................–0.3V to 4V
SCKI
+
, SCKI
–
, SCKO
+
, SCKO
–
, SDI
+
, SDI
–
,
SDO
+
, SDO
–
, LDI, PWMCK
+
, PWMCK
–
, SYNC,
SS, EN/UVLO
............................................. –0.3V to V
CC
Operating Junction Temperature Range
(Notes 2, 3)
LT3745E-1 .........................................–40°C to 125°C
LT3745I-1 ..........................................–40°C to 125°C
Storage Temperature Range
..................–65°C to 125°C
(Note 1)
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply
V
IN
V
IN
Operating Voltage
l
6 55 V
I
VIN
V
IN
Supply Current V
EN/UVLO
= 0V
No Switching
0.2
0.4
2
0.55
µA
mA
V
CC
V
CC
Operating Voltage
l
3 3.6 V
I
VCC
V
CC
Supply Current (Note 4) V
EN/UVLO
= 0V
LED Channel Off, 30MHz Data Off
LED Channel On, 30MHz Data Off
LED Channel On, 30MHz Data On
0.25
11
16
19
mA
mA
mA
mA
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
CC
= 3.3V, V
EN/UVLO
= 1.5V, V
FB
= 1.5V, V
ISP
= V
ISN
= 0V,
R
T
= 105k, R
ISET
= 60.4k, C
CAP
= 0.47µF to V
IN
, unless otherwise noted.
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3745EUJ-1#PBF LT3745EUJ-1#TRPBF LT3745UJ-1 40-Lead (6mm × 6mm) Plastic QFN –40°C to 125°C
LT3745IUJ-1#PBF LT3745IUJ-1#TRPBF LT3745UJ-1 40-Lead (6mm × 6mm) Plastic QFN –40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for
information on nonstandard 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/
PIN CONFIGURATION
3940 38 37 36 35 34 33 32 31
11 20
12 13 14 15
TOP VIEW
41
GND
UJ PACKAGE
40-LEAD (6mm × 6mm) PLASTIC QFN
16 17 18 19
22
23
24
25
26
27
28
29
9
8
7
6
5
4
3
2
EN/UVLO
LED07
LED06
LED05
LED04
LED03
LED02
LED01
LED00
SCKI
–
SYNC
LED08
LED09
LED10
LED11
LED12
LED13
LED14
LED15
SCKO
–
I
SET
T
SET
V
IN
GATE
CAP
ISP
ISN
FB
SS
RT
SCKI
+
SDI
–
SDI
+
LDI
V
CC
PWMCK
+
PWMCK
–
SDO
+
SDO
–
SCKO
+
21
30
10
1
T
JMAX
= 125°C, θ
JA
= 34°C/W, θ
JC
= 2.5°C/W
EXPOSED PAD (PIN 41) IS GND, MUST BE SOLDERED TO PCB