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