Datasheet
LT3746
2
3746fa
For more information www.linear.com/3746
pin conFiguraTionabsoluTe MaxiMuM raTings
V
IN
.......................................................................... 57V
CAP ......................................................... V
IN
– 8V to V
IN
GATE ..............................................................CAP to V
IN
LED00 to LED31, ISP, ISN .........................................13V
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) ............................................–40°C to 125°C
Storage Temperature Range ..................–65°C to 125°C
(Note 1)
19 20 21 22
TOP VIEW
57
GND
UHH PACKAGE
56-LEAD (5mm × 9mm) PLASTIC QFN
23 24 25 26 27 28
56 55 54 53 52 51 50 49 48 47
39
40
41
42
43
44
45
46
8
7
6
5
4
3
2
1EN/UVLO
LED15
LED14
LED13
LED12
LED11
LED10
LED09
LED08
LED07
LED06
LED05
LED04
LED03
LED02
LED01
LED00
GND
SYNC
LED16
LED17
LED18
LED19
LED20
LED21
LED22
LED23
LED24
LED25
LED26
LED27
LED28
LED29
LED30
LED31
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
38
37
36
35
34
33
32
31
30
29
9
10
11
12
13
14
15
16
17
18
T
JMAX
= 125°C, θ
JA
= 32°C/W, θ
JC
= 2.0°C/W
EXPOSED PAD (PIN 57) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3746EUHH#PBF LT3746EUHH#TRPBF 3746 56-Lead (5mm × 9mm) Plastic QFN –40°C to 125°C
LT3746IUHH#PBF LT3746IUHH#TRPBF 3746 56-Lead (5mm × 9mm) 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 non-standard 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/