LT8551

2

Rev 0

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PIN CONFIGURATION

ABSOLUTE MAXIMUM RATINGS

SW1/2/3/4 (Note 5)…………………………………..80V

REGIS, REGDRV Voltage (Note 2)......... .–0.3V to 80V

SHDN Voltage………………………………–0.3V to 70V

TGSL Voltage…………………………………–3V to 80V

TGSH Voltage…………………………………–3V to 86V

TG1/2/3/4, BST1/2/3/4, TGSR Voltage ..... . –0.3V to 86V

BG1/2/3/4, RT/MS, SYNC, PHS1/2/3, CLK1/2,

REGSNS, IAMPP, ILIM, BGSH, BGBUF, TGBUF,

(TGSR–TGSL), (TGSH–TGSL) Voltage .. –0.3V to 6.0V

IAMPN Voltage…………………………… –0.6V to 0.6V

(ISP–ISN)1/2/3/4, (ISP–ISN) Voltage …... –0.3V to 0.3V

Operating Junction Temperature Range (Note 3)

LT8551E............................................. –40°C to 125°C

LT8551I.............................................. –40°C to 125°C

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

(Note 1)

16

15

17 18 19

TOP VIEW

53

GND

UKG PACKAGE

52-LEAD (7mm × 8mm) PLASTIC QFN

EXPOSED PAD (PIN 53) IS GND, MUST BE SOLDERED TO PCB

20 21 22 23 24 25 26

51

52

50 49 48 47 46 45 44 43 42 41

33

34

35

36

37

38

39

40

8

7

6

5

4

3

2

1

BG4

BG3

REG

SW3

TG3

BST3

BST2

TG2

SW2

BG2

BG1

BGBUF

TGBUF

BST1

REGSNS

ISP4

ISN4

ISP2

ISN2

ISP

ISN

IAMPP

IAMPN

SHDN

MODE

ENOUT

ILIM

32

31

30

29

28

27

9

10

11

12

13

14

ORDER INFORMATION

LEAD FREE FINISH

TAPE AND REEL

PART MARKING*

PACKAGE DESCRIPTION

TEMPERATURE RANGE

LT8551EUKG#PBF

LT8551EUKG#TRPBF

8551

52-Pin (7mm × 8mm) Plastic QFN

–40°C to 125°C

LT8551IUKG#PBF

LT8551IUKG#TRPBF

8551

52-Pin (7mm × 8mm) Plastic QFN

–40°C to 125°C

Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.

Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.