Voltage Regulators - Switching Regulators

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LT8640/LT8640-1 Step-Down Regulators

Analog Devices Inc. LT8640/LT8640-1 Step-Down Regulators feature Silent Switcher architecture designed to minimize EMI/EMC emissions while delivering high efficiency at frequencies up to 3MHz. An ultralow 2.5µA quiescent current—with the output in full regulation—enables applications requiring the highest efficiency at very small load currents. The LT8640/LT8640-1 allows high V_IN to low V_OUT conversion at high frequency with a fast minimum top switch on-time of 30ns. The SYNC/MODE pin selects between Burst Mode operation, spread spectrum mode, synchronization to an external clock, and either pulse-skipping (LT8640) or forced continuous mode (LT8640-1).

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Part #

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640IUDC#PBF
Analog Devices
1: RM69.03
7,705In Stock

Mfr. Part No.
LT8640IUDC#PBF

Mouser Part No
584-LT8640IUDC#PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

7,705In Stock

RM69.03

RM54.19

RM53.81

RM45.73

RM43.48

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

1.7 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Tube

Switching Voltage Regulators 42V, 6A Sync Buck Silent Switcher 2 w/ 2

LT8640SHV-2#PBF
Analog Devices
1: RM74.19
11,375In Stock

Mfr. Part No.
LT8640SHV-2#PBF

Mouser Part No
584-LT8640SHV-2#PBF

Analog Devices

Switching Voltage Regulators 42V, 6A Sync Buck Silent Switcher 2 w/ 2

Learn More

Datasheet

11,375In Stock

RM74.19

RM59.94

RM57.49

RM55.12

RM50.59

Min.: 1
Mult.: 1

SMD/SMT

LQFN-24

Buck

970 mV to 41.58 V

6 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 150 C

LT8640S

Tray

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640JUDCF#PBF
Analog Devices
1: RM75.89
7,103In Stock

Mfr. Part No.
LT8640JUDCF#PBF

Mouser Part No
584-LT8640JUDCF#PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

7,103In Stock

RM75.89

RM61.34

RM58.84

RM51.78

Quote

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Tube

Switching Voltage Regulators 42V, 6A Sync Buck Silent Switcher 2 w/ 2

LT8640SIV-2#PBF
Analog Devices
1: RM72.71
6,795In Stock

Mfr. Part No.
LT8640SIV-2#PBF

Mouser Part No
584-LT8640SIV-2#PBF

Analog Devices

Switching Voltage Regulators 42V, 6A Sync Buck Silent Switcher 2 w/ 2

Learn More

Datasheet

6,795In Stock

RM72.71

RM57.06

RM54.69

RM51.52

RM45.81

Min.: 1
Mult.: 1

SMD/SMT

LQFN-24

Buck

970 mV to 41.58 V

6 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640S

Tray

Switching Voltage Regulators 42V, 6A Sync Buck Silent Switcher 2 w/ 2

LT8640SIV#PBF
Analog Devices
1: RM72.71
17,518In Stock

Mfr. Part No.
LT8640SIV#PBF

Mouser Part No
584-LT8640SIVPBF

Analog Devices

Switching Voltage Regulators 42V, 6A Sync Buck Silent Switcher 2 w/ 2

Learn More

Datasheet

17,518In Stock

RM72.71

RM57.06

RM54.69

RM51.52

RM45.81

Min.: 1
Mult.: 1

SMD/SMT

LQFN-24

Buck

970 mV to 41.58 V

6 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640S

Tray

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640JUDCF#WPBF
Analog Devices
1: RM79.44
189In Stock

Mfr. Part No.
LT8640JUDCF#WPBF

Mouser Part No
584-LT8640JUDCF#WPBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

189In Stock

RM79.44

RM64.21

RM61.59

RM54.23

Quote

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

AEC-Q100

LT8640

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640EUDCF#PBF
Analog Devices
1: RM68.15
177In Stock

Mfr. Part No.
LT8640EUDCF#PBF

Mouser Part No
584-LT8640EUDCF#PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

177In Stock

RM68.15

RM53.47

RM51.31

RM45.13

View

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

1.7 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640IUDCF-1#PBF
Analog Devices
1: RM68.99
219In Stock

Mfr. Part No.
LT8640IUDCF-1#PBF

Mouser Part No
584-8640IUDCF-1#PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

219In Stock

RM68.99

RM54.14

RM51.94

RM45.68

View

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.58 V

5 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640IUDCF-1#TRPBF
Analog Devices
1: RM68.99
5,879In Stock

Mfr. Part No.
LT8640IUDCF-1#TRPBF

Mouser Part No
584-8640IUDCF-1TRPBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

5,879In Stock

Cut Tape

RM68.99

RM54.14

RM51.90

RM45.73

RM43.48

Reel

RM43.44

MouseReel Available

Min.: 1
Mult.: 1

Reel: 2,500

SMD/SMT

QFN-18

Buck

970 mV to 41.58 V

5 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Reel, Cut Tape, MouseReel

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640IUDCF#PBF
Analog Devices
1: RM72.71
75In Stock

Mfr. Part No.
LT8640IUDCF#PBF

Mouser Part No
584-LT8640IUDCF#PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

75In Stock

RM72.71

RM58.75

RM56.43

RM49.62

RM49.58

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

1.7 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640EUDCF-1#PBF
Analog Devices
1: RM64.00
89In Stock

Mfr. Part No.
LT8640EUDCF-1#PBF

Mouser Part No
584-LT8640EUDCF1PB

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

89In Stock

RM64.00

RM48.60

RM46.70

RM41.07

View

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

1.7 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640IUDC-1#TRPBF
Analog Devices
1: RM68.99
2,156In Stock

Mfr. Part No.
LT8640IUDC-1#TRPBF

Mouser Part No
584-8640IUDC-1TRPBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

2,156In Stock

Cut Tape

RM68.99

RM54.14

RM51.90

RM45.73

RM43.48

Reel

RM43.48

MouseReel Available

Min.: 1
Mult.: 1

Reel: 2,500

SMD/SMT

QFN-18

Buck

970 mV to 41.58 V

5 A

1 Output

1.7 uA, 2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Reel, Cut Tape, MouseReel

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640EUDC#PBF
Analog Devices
1: RM64.76
4,687In Stock

Mfr. Part No.
LT8640EUDC#PBF

Mouser Part No
584-LT8640EUDC#PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

4,687In Stock

RM64.76

RM49.19

RM47.16

RM41.54

RM39.51

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640EUDC-1#PBF
Analog Devices
1: RM64.76
2,735In Stock

Mfr. Part No.
LT8640EUDC-1#PBF

Mouser Part No
584-LT8640EUDC-1#PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

2,735In Stock

RM64.76

RM49.19

RM47.16

RM41.54

RM39.51

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

1.7 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640IUDC#TRPBF
Analog Devices
1: RM68.99
3,688In Stock

Mfr. Part No.
LT8640IUDC#TRPBF

Mouser Part No
584-LT8640IUDC#TRPBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

3,688In Stock

Cut Tape

RM68.99

RM54.14

RM51.90

RM45.73

RM43.48

Reel

RM43.48

MouseReel Available

Min.: 1
Mult.: 1

Reel: 2,500

SMD/SMT

QFN-18

Buck

970 mV to 41.58 V

5 A

1 Output

2.5 uA, 300 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Reel, Cut Tape, MouseReel

Switching Voltage Regulators 42V, 6A Sync Buck Silent Switcher 2 w/ 2

LT8640SEV-2#PBF
Analog Devices
1: RM66.16
10,916In Stock

Mfr. Part No.
LT8640SEV-2#PBF

Mouser Part No
584-LT8640SEV-2#PBF

Analog Devices

Switching Voltage Regulators 42V, 6A Sync Buck Silent Switcher 2 w/ 2

Learn More

Datasheet

10,916In Stock

RM66.16

RM51.90

RM49.79

RM43.87

RM41.71

Min.: 1
Mult.: 1

SMD/SMT

LQFN-24

Buck

970 mV to 41.58 V

6 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640S

Tray

Switching Voltage Regulators 42V, 6A Sync Buck Silent Switcher 2 w/ 2

LT8640SEV#PBF
Analog Devices
1: RM66.16
6,735In Stock

Mfr. Part No.
LT8640SEV#PBF

Mouser Part No
584-LT8640SEVPBF

Analog Devices

Switching Voltage Regulators 42V, 6A Sync Buck Silent Switcher 2 w/ 2

Learn More

Datasheet

6,735In Stock

RM66.16

RM51.90

RM49.79

RM43.87

RM41.71

Min.: 1
Mult.: 1

SMD/SMT

LQFN-24

Buck

970 mV to 41.58 V

6 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640S

Tray

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640EUDC-1#TRPBF
Analog Devices
1: RM64.76
763In Stock

Mfr. Part No.
LT8640EUDC-1#TRPBF

Mouser Part No
584-8640EUDC-1TRPBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

763In Stock

Cut Tape

RM64.76

RM49.19

RM47.16

RM41.54

RM39.51

Reel

RM39.51

MouseReel Available

Min.: 1
Mult.: 1

Reel: 2,500

SMD/SMT

QFN-18

Buck

970 mV to 41.58 V

5 A

1 Output

1.7 uA, 2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Reel, Cut Tape, MouseReel

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640EUDC#TRPBF
Analog Devices
1: RM64.76
1,048In Stock
2,490Expected 16/2/2026

Mfr. Part No.
LT8640EUDC#TRPBF

Mouser Part No
584-LT8640EUDC#TRPBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

1,048In Stock

2,490Expected 16/2/2026

Cut Tape

RM64.76

RM49.19

RM47.16

RM41.54

RM39.51

Reel

RM39.51

MouseReel Available

Min.: 1
Mult.: 1

Reel: 2,500

SMD/SMT

QFN-18

Buck

970 mV to 41.58 V

5 A

1 Output

2.5 uA, 300 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Reel, Cut Tape, MouseReel

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640HUDC#PBF
Analog Devices
1: RM72.46
438In Stock
273Expected 23/2/2026

Mfr. Part No.
LT8640HUDC#PBF

Mouser Part No
584-LT8640HUDC#PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

438In Stock

273Expected 23/2/2026

RM72.46

RM56.85

RM54.52

RM48.01

RM45.68

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

1.7 uA

200 kHz to 3 MHz

- 40 C

+ 150 C

LT8640

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640HUDC#TRPBF
Analog Devices
1: RM72.46
360In Stock

Mfr. Part No.
LT8640HUDC#TRPBF

Mouser Part No
584-LT8640HUDC#TRPBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

360In Stock

Cut Tape

RM72.46

RM56.85

RM54.52

RM48.01

RM45.68

Reel

RM45.68

MouseReel Available

Min.: 1
Mult.: 1

Reel: 2,500

SMD/SMT

QFN-18

Buck

970 mV to 41.58 V

5 A

1 Output

2.5 uA, 300 uA

200 kHz to 3 MHz

- 40 C

+ 150 C

LT8640

Reel, Cut Tape, MouseReel

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640IUDC-1#PBF
Analog Devices
1: RM68.99
645In Stock

Mfr. Part No.
LT8640IUDC-1#PBF

Mouser Part No
584-LT8640IUDC-1#PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

645In Stock

RM68.99

RM54.14

RM51.90

RM45.73

RM43.48

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

1.7 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640HUDC-1#PBF
Analog Devices
1: RM72.46
23In Stock

Mfr. Part No.
LT8640HUDC-1#PBF

Mouser Part No
584-LT8640HUDC-1#PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

23In Stock

RM72.46

RM56.85

RM54.52

RM48.01

RM45.68

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.58 V

5 A

1 Output

300 uA

200 kHz to 3 MHz

- 40 C

+ 150 C

LT8640

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640HUDCF#PBF
Analog Devices
1: RM86.80
52In Stock

Mfr. Part No.
LT8640HUDCF#PBF

Mouser Part No
584-LT8640HUDCF#PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

52In Stock

RM86.80

RM71.87

RM68.91

RM60.70

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

1.7 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Tube

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

LT8640JUDCF-1#PBF
Analog Devices
1: RM72.71
28In Stock

Mfr. Part No.
LT8640JUDCF-1#PBF

Mouser Part No
584-LT8640JUDCF-1PBF

Analog Devices

Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5

Learn More

Datasheet

28In Stock

RM72.71

RM58.75

RM56.34

RM49.62

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

970 mV to 41.9 V

5 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640

Tube

LT8640/LT8640-1 Step-Down Regulators

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