LT3640EUFDPBF datasheet(2/24 Pages) LINER

Part #	LT3640EUFDPBF

Description	Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LT3640

2

3640p

ABSOLUTE MAXIMUM RATINGS

VIN, EN/UVLO Voltage (Note 7) .................................55V

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

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

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

VIN2, SYNC, EN2, PGOOD, WDI,

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

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

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

(Note 1)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

TOP VIEW

FE PACKAGE

28-LEAD PLASTIC TSSOP

28

27

26

25

24

23

22

21

20

19

18

17

16

15

FB2

PGOOD

EN/UVLO

SYNC

SS1

FB1

RT

RST2

RST1

WDO

CWDT

CPOR

WDE

WDI

SS2

EN2

GND

SW2

VIN2

GND

VIN

BST

SW

SW1

DA

NC

GND

29

θJA = 30°C/W

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

9

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

VIN2

GND

VIN

BST

SW

SW1

DA

7

17

18

19

20

21

22

16

8

15

29

GND

θJA = 34°C/W

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.

For more information on lead free part marking, go to: http://www.linear.com/leadfree/

For more information on tape and reel speciﬁcations, go to: http://www.linear.com/tapeandreel/

SW2 Voltage ................................ –0.3V to (VIN2 + 0.3V)

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

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LT3640EUFDPBF Datasheet(PDF) 2 Page - Linear Technology

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