LT3959

2

3959fa

For more information www.linear.com/LT3959

pin conFiguraTion

absoluTe MaxiMuM raTings

EN/UVLO (Note 2).....................................................40V

DRIVE .......................................................................40V

PGOOD......................................................................40V

SW............................................................................40V

SYNC ..........................................................................8V

(Note 1)

RT ............................................................................1.5V

GND, GNDK to SGND .............................................±0.3V

FBX ................................................................. –3V to 3V

Operating Junction Temperature Range (Note 3)

LT3959E/LT3959I .............................. –40°C to 125°C

Storage Temperature Range .................. –65°C to 125°C

12 13 14

TOP VIEW

UHEMA PACKAGE

36-LEAD (5mm

× 6mm) PLASTIC QFN

15 16 17

36 35 34 33 32 31 30

21

23

24

25

27

28

8

6

4

3

2

1

NC

NC

NC

SGND

NC

SW

SW

NC

DRIVE

EN/UVLO

SGND

NC

SW

SW

20

9

10

37

SGND

38

SW

EXPOSED PAD (PIN 37) IS SGND, MUST BE SOLDERED TO SGND PLANE

EXPOSED PAD (PIN 38) IS SW, MUST BE SOLDERED TO SW PLANE

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

TOP VIEW

FE PACKAGE

38-LEAD PLASTIC TSSOP

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

20

NC

NC

NC

FBX

SS

RT

SYNC

PGOOD

SGND

NC

SW

NC

NC

SW

NC

GNDK

GND

GND

NC

NC

NC

NC

EN/UVLO

DRIVE

NC

SGND

NC

SW

NC

NC

SW

NC

GND

GND

GND

39

SGND

40

SW

EXPOSED PAD (PIN 39) IS SGND, MUST BE SOLDERED TO SGND PLANE

EXPOSED PAD (PIN 40) IS SW, MUST BE SOLDERED TO SW PLANE