LT3640

2

3640p

ABSOLUTE MAXIMUM RATINGS

WDE Voltage .............................................................30V

BST Above SW, SW1 Voltage ....................... –0.3V to 6V

SW1 Above SW Voltage ............................... –0.3V to 6V

WDO, RST1, RST2, Voltages ....................... –0.3V to 6V

SS1, SS2, FB1, FB2, RT, CWDT,

CPOR Voltages……….............................. –0.3V to 2.5V

(Note 1)

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2

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14

TOP VIEW

FE PACKAGE

28-LEAD PLASTIC TSSOP

28

27

26

25

24

23

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21

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19

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17

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15

FB2

PGOOD

EN/UVLO

SYNC

SS1

FB1

RT

RST2

RST1

WDO

CWDT

CPOR

WDE

WDI

SS2

EN2

GND

SW2

GND

BST

SW

SW1

DA

NC

GND

GND

29

EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB

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10

TOP VIEW

UFD PACKAGE

28-LEAD (4mm

5mm) PLASTIC QFN

11 12 13

28 27 26 25 24

14

23

6

5

4

3

2

1

SYNC

SS1

FB1

RT

RST2

RST1

WDO

CWDT

SW2

GND

BST

SW

SW1

DA

7

17

18

19

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21

22

16

8

15

29

GND

EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB

PIN CONFIGURATION

ORDER INFORMATION

LEAD FREE FINISH

TAPE AND REEL

PART MARKING*

PACKAGE DESCRIPTION

TEMPERATURE RANGE

LT3640EFE#PBF

LT3640EFE#TRPBF

LT3640FE

28-Lead Plastic TSSOP

–40°C to 125°C

LT3640IFE#PBF

LT3640IFE#TRPBF

LT3640FE

28-Lead Plastic TSSOP

–40°C to 125°C

LT3640EUFD#PBF

LT3640EUFD#TRPBF

3640

28-Lead (4mm × 5mm) Plastic QFN

–40°C to 125°C

LT3640IUFD#PBF

LT3640IUFD#TRPBF

3640

28-Lead (4mm × 5mm) 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.

DA Current ..................................................................2A

Operating Junction Temperature Range (Note 2)

LT3640E ................................................. –40°C to 125°C

LT3640I .................................................. –40°C to 125°C

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

Lead Temperature, FE Only (Soldering, 10 sec) .... 300°C