Datasheet
LT3745
2
3745f
pin conFiguraTionabsoluTe 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 6V
SCKI, SCKO, SDI, SDO, LDI, LDO, PWMCK, SYNC,
SS, EN/UVLO ............................................. –0.3V to V
CC
Operating Junction Temperature Range
(Notes 2, 3)
LT3745E ............................................–40°C to 125°C
LT3745I .............................................–40°C to 125°C
Storage Temperature Range ..................–65°C to 125°C
(Note 1)
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
GND
SYNC
LED08
LED09
LED10
LED11
LED12
LED13
LED14
LED15
GND
I
SET
T
SET
V
IN
GATE
CAP
ISP
ISN
FB
SS
RT
SCKI
GND
SDI
LDI
V
CC
PWMCK
LDO
SDO
GND
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
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3745EUJ#PBF LT3745EUJ#TRPBF 3745 40-Lead (6mm × 6mm) Plastic QFN –40°C to 125°C
LT3745IUJ#PBF LT3745IUJ#TRPBF 3745 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/