Datasheet
LT3743
2
3743fd
V
IN
Voltage ................................................................ 40V
EN/UVLO Voltage
........................................................6V
V
REF
Voltage ...............................................................3V
CTRL_L, CTRL_H, CTRL_T Voltage
............................ 3V
PWM, CTRL_SEL Voltage
...........................................6V
SENSE
+
Voltage ........................................................40V
SENSE
–
Voltage ........................................................40V
V
CH
, V
CL
Voltage .........................................................3V
SW Voltage
...............................................................40V
(Note 1)
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3743EUFD#PBF LT3743EUFD#TRPBF 3743 28-Lead (4mm × 5mm) Plastic QFN –40°C to 125°C
LT3743IUFD#PBF LT3743IUFD#TRPBF 3743 28-Lead (4mm × 5mm) Plastic QFN –40°C to 125°C
LT3743EFE#PBF LT3743EFE#TRPBF LT3743FE 28-Lead Plastic TSSOP –40°C to 125°C
LT3743IFE#PBF LT3743IFE#TRPBF LT3743FE 28-Lead Plastic TSSOP –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 LT C 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/
ABSOLUTE MAXIMUM RATINGS
9 10
TOP VIEW
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
11 12 13
28 27 26 25 24
14
23
6
5
4
3
2
1
GND
EN/UVLO
V
REF
CTRL_T
GND
CTRL_H
CTRL_L
SS
PWMGL
GND
GND
PWMGH
PWM
CTRL_SEL
SYNC
RT
V
IN
V
CC_INT
LG
CBOOT
SW
HG
GND
FB
SENSE
+
SENSE
–
V
CL
V
CH
7
17
18
19
20
21
22
16
8
15
29
GND
T
JMAX
= 125°C, θ
JA
= 37°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
FE PACKAGE
28-LEAD PLASTIC TSSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
CC_INT
GND
V
IN
EN/UVLO
V
REF
CTRL_T
GND
CTRL_H
CTRL_L
SS
GND
FB
SENSE
+
SENSE
–
LG
GND
CBOOT
SW
HG
PWMGL
GND
PWMGH
PWM
CTRL_SEL
SYNC
RT
V
CH
V
CL
29
GND
T
JMAX
= 125°C, θ
JA
= 30°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
PIN CONFIGURATION
CBOOT ......................................................................46V
RT Voltage
..................................................................3V
FB Voltage
................................................................... 3V
SS Voltage
..................................................................6V
SYNC Voltage
..............................................................6V
Storage Temperature Range
.................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
TSSOP .............................................................. 300°C
(Note 2)