LT3959

2

3959f

PIN CONFIGURATION

ABSOLUTE MAXIMUM RATINGS

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

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

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

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

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

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

(Note 1)

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

SGND

37

SW

38

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

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

ORDER INFORMATION

LEAD FREE FINISH

TAPE AND REEL

PART MARKING*

PACKAGE DESCRIPTION

TEMPERATURE RANGE

LT3959EUHE#PBF

LT3959EUHE#TRPBF

3959

36-Lead (5mm × 6mm) Plastic QFN

–40°C to 125°C

LT3959IUHE#PBF

LT3959IUHE#TRPBF

3959

36-Lead (5mm × 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 non-standard lead based finish parts.