LT8645S/LT8646S

2

Rev. B

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PIN CONFIGURATION

ABSOLUTE MAXIMUM RATINGS

VIN, EN/UV................................................................65V

PG.............................................................................42V

BIAS..........................................................................25V

FB, TR/SS . .................................................................4V

SYNC/MODE Voltage . ................................................6V

(Note 1)

LT8645S

LT8646S

LQFN PACKAGE

32-LEAD (6mm × 4mm × 0.94mm)

JEDEC BOARD: θJA = 30°C/W, ΨJT = 0.6°C/W,

θJCTOP = 28.5°C/W, θJC(PAD) = 4.4°C/W (NOTE 3)

DEMO BOARD: θJA = 17°C/W

EXPOSED PADS (PINS 33-38) ARE GND, SHOULD BE SOLDERED TO PCB

TOP VIEW

11 12 13 14 15 16

32

31 30 29 28 27

21

17

18

19

20

26

22

23

24

25

6

10

9

8

7

1

5

4

3

2

VIN

GND

GND

GND

NC

BIAS

VIN

VIN

NC

INTVCC

VIN

GND

GND

GND

NC

RT

VIN

VIN

NC

EN/UV

33

GND

34

GND

35

GND

36

GND

37

GND

38

GND

LQFN PACKAGE

32-LEAD (6mm × 4mm × 0.94mm)

JEDEC BOARD: θJA = 30°C/W, ΨJT = 0.6°C/W,

θJCTOP = 28.5°C/W, θJC(PAD) = 4.4°C/W (NOTE 3)

DEMO BOARD: θJA = 17°C/W

EXPOSED PADS (PINS 33-38) ARE GND, SHOULD BE SOLDERED TO PCB

TOP VIEW

11 12 13 14 15 16

32

31 30 29 28 27

21

17

18

19

20

26

22

23

24

25

6

10

9

8

7

1

5

4

3

2

VIN

GND

GND

GND

NC

BIAS

VIN

VIN

NC

INTVCC

VIN

GND

GND

GND

NC

RT

VIN

VIN

NC

EN/UV

33

GND

34

GND

35

GND

36

GND

37

GND

38

GND

Operating Junction Temperature Range (Note 2)

LT8645SE/LT8646SE......................... –40°C to 125°C

LT8645SI/LT8646SI........................... –40°C to 125°C

Storage Temperature Range .................. –65°C to 150°C

Maximum Reflow (Package Body) Temperature ...260°C