Voltage Regulators - Switching Regulators

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LT86x Synchronous Step-Down Silent Switchers

Analog Devices LT86xx Synchronous Step-Down Regulators feature Silent Switcher^® architecture designed to minimize EMI/EMC emissions while delivering high efficiency at frequencies up to 3MHz. Assembled in a 3mm × 4mm QFN package, the monolithic construction with integrated power switches and the inclusion of all necessary circuitry yields a solution with a minimal PCB footprint. An ultra-low 2.5µA quiescent current enables applications requiring the highest efficiency at very small load currents. The transient response remains excellent and output voltage ripple is below 10mVP-P at any load, from zero to full current.

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Part #

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

LT8640JUDCF#PBF
Analog Devices
1: $16.54
7,099In Stock

Mfr. Part #
LT8640JUDCF#PBF

Mouser Part #
584-LT8640JUDCF#PBF

Analog Devices

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

Learn More

Datasheet

7,099In Stock

$16.54

$13.12

$11.35

$10.79

View

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

LT8640IUDCF-1#PBF
Analog Devices
1: $14.80
199In Stock

Mfr. Part #
LT8640IUDCF-1#PBF

Mouser Part #
584-8640IUDCF-1#PBF

Analog Devices

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

Learn More

Datasheet

199In Stock

$14.80

$11.69

$10.10

$9.96

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

LT8640JUDCF#WPBF
Analog Devices
1: $17.21
167In Stock

Mfr. Part #
LT8640JUDCF#WPBF

Mouser Part #
584-LT8640JUDCF#WPBF

Analog Devices

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

Learn More

Datasheet

167In Stock

$17.21

$13.35

$12.30

$11.15

View

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

LT8640IUDCF-1#TRPBF
Analog Devices
1: $14.79
5,694In Stock

Mfr. Part #
LT8640IUDCF-1#TRPBF

Mouser Part #
584-8640IUDCF-1TRPBF

Analog Devices

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

Learn More

Datasheet

5,694In Stock

Cut Tape

$14.79

$11.68

$10.76

$10.05

View

Reel

$8.75

MouseReel Available

Min.: 1
Mult.: 1

: 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

LT8640EUDCF#PBF
Analog Devices
1: $14.62
175In Stock

Mfr. Part #
LT8640EUDCF#PBF

Mouser Part #
584-LT8640EUDCF#PBF

Analog Devices

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

Learn More

Datasheet

175In Stock

$14.62

$11.54

$9.83

$9.45

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

LT8640JUDCF-1#PBF
Analog Devices
1: $15.42
91In Stock

Mfr. Part #
LT8640JUDCF-1#PBF

Mouser Part #
584-LT8640JUDCF-1PBF

Analog Devices

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

Learn More

Datasheet

91In Stock

$15.42

$11.68

$10.58

$9.33

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 65V 3.5A Silent Switcher

LT8641ARUDCM#WPBF
Analog Devices
1: $7.62
239In Stock
New Product

Mfr. Part #
LT8641ARUDCM#WPBF

Mouser Part #
584-LT8641ARUDCMWPBF

New Product

Analog Devices

Switching Voltage Regulators 65V 3.5A Silent Switcher

Learn More

Datasheet

239In Stock

$7.62

$5.89

$5.00

$4.81

Min.: 1
Mult.: 1
Max.: 100

SMD/SMT

QFN-18

Buck

3.5 A

1 Output

1.7 uA

210 kHz to 1.95 MHz

- 40 C

+ 150 C

LT8641

Tube

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

LT8640EUDC#TRPBF
Analog Devices
1: $13.56
5,425In Stock

Mfr. Part #
LT8640EUDC#TRPBF

Mouser Part #
584-LT8640EUDC#TRPBF

Analog Devices

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

Learn More

Datasheet

5,425In Stock

Cut Tape

$13.56

$10.68

$9.96

$9.17

View

Reel

$7.95

MouseReel Available

Min.: 1
Mult.: 1

: 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

LT8640EUDC-1#PBF
Analog Devices
1: $13.56
1,913In Stock

Mfr. Part #
LT8640EUDC-1#PBF

Mouser Part #
584-LT8640EUDC-1#PBF

Analog Devices

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

Learn More

Datasheet

1,913In Stock

$13.56

$10.68

$9.21

$8.90

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#PBF
Analog Devices
1: $14.80
6,025In Stock

Mfr. Part #
LT8640IUDC#PBF

Mouser Part #
584-LT8640IUDC#PBF

Analog Devices

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

Learn More

Datasheet

6,025In Stock

$14.80

$11.69

$10.10

$9.77

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 65V, 3.5A Sync Buck Silent Switcher w/ 2

LT8641IUDC#PBF
Analog Devices
1: $15.16
3,796In Stock

Mfr. Part #
LT8641IUDC#PBF

Mouser Part #
584-LT8641IUDC#PBF

Analog Devices

Switching Voltage Regulators 65V, 3.5A Sync Buck Silent Switcher w/ 2

Learn More

Datasheet

3,796In Stock

$15.16

$11.87

$11.05

$10.14

$10.05

Min.: 1
Mult.: 1
Max.: 364

SMD/SMT

QFN-18

Buck

810 mV to 64 V

3.5 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8641

Tube

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

LT8640EUDC-1#TRPBF
Analog Devices
1: $13.56
1,358In Stock
2,500Expected 4/16/2027

Mfr. Part #
LT8640EUDC-1#TRPBF

Mouser Part #
584-8640EUDC-1TRPBF

Analog Devices

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

Learn More

Datasheet

1,358In Stock

2,500Expected 4/16/2027

Cut Tape

$13.56

$10.68

$9.96

$9.17

View

Reel

$8.17

MouseReel Available

Min.: 1
Mult.: 1

: 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

LT8640IUDC-1#TRPBF
Analog Devices
1: $14.80
862In Stock

Mfr. Part #
LT8640IUDC-1#TRPBF

Mouser Part #
584-8640IUDC-1TRPBF

Analog Devices

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

Learn More

Datasheet

862In Stock

Cut Tape

$14.80

$11.69

$10.91

$10.06

View

Reel

$8.75

MouseReel Available

Min.: 1
Mult.: 1

: 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

LT8640HUDC#PBF
Analog Devices
1: $15.47
835In Stock
3,830On Order

Mfr. Part #
LT8640HUDC#PBF

Mouser Part #
584-LT8640HUDC#PBF

Analog Devices

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

Learn More

Datasheet

835In Stock

3,830On Order

$15.47

$12.24

$10.59

$10.24

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

+ 150 C

LT8640

Tube

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

LT8640IUDC-1#PBF
Analog Devices
1: $14.80
158In Stock

Mfr. Part #
LT8640IUDC-1#PBF

Mouser Part #
584-LT8640IUDC-1#PBF

Analog Devices

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

Learn More

Datasheet

158In Stock

$14.80

$11.69

$10.81

$9.77

$9.60

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 65V, 3.5A Sync Buck Silent Switcher w/ 2

LT8641HUDC#PBF
Analog Devices
1: $15.47
633In Stock

Mfr. Part #
LT8641HUDC#PBF

Mouser Part #
584-LT8641HUDC#PBF

Analog Devices

Switching Voltage Regulators 65V, 3.5A Sync Buck Silent Switcher w/ 2

Learn More

Datasheet

633In Stock

$15.47

$12.24

$10.59

$10.24

View

Min.: 1
Mult.: 1

SMD/SMT

QFN-18

Buck

810 mV to 64 V

3.5 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 150 C

LT8641

Tube

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

LT8640HUDC-1#PBF
Analog Devices
1: $15.93
57In Stock
1,001On Order

Mfr. Part #
LT8640HUDC-1#PBF

Mouser Part #
584-LT8640HUDC-1#PBF

Analog Devices

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

Learn More

Datasheet

57In Stock

1,001On Order

$15.93

$12.49

$11.61

$10.21

View

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: $19.16
52In Stock

Mfr. Part #
LT8640HUDCF#PBF

Mouser Part #
584-LT8640HUDCF#PBF

Analog Devices

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

Learn More

Datasheet

52In Stock

$19.16

$15.26

$13.27

$12.85

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#TRPBF
Analog Devices
1: $14.80
16In Stock
2,500Expected 4/7/2027

Mfr. Part #
LT8640IUDC#TRPBF

Mouser Part #
584-LT8640IUDC#TRPBF

Analog Devices

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

Learn More

Datasheet

16In Stock

2,500Expected 4/7/2027

Cut Tape

$14.80

$11.69

$10.91

$10.06

View

Reel

$9.17

MouseReel Available

Min.: 1
Mult.: 1

: 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

LT8640IUDCF#PBF
Analog Devices
1: $15.94
25In Stock
1,820On Order

Mfr. Part #
LT8640IUDCF#PBF

Mouser Part #
584-LT8640IUDCF#PBF

Analog Devices

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

Learn More

Datasheet

25In Stock

1,820On Order

$15.94

$12.62

$10.93

$10.57

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

LT8640JUDCF-1#WPBF
Analog Devices
1: $16.59
100In Stock

Mfr. Part #
LT8640JUDCF-1#WPBF

Mouser Part #
584-LT8640JUDCF1WPBF

Analog Devices

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

Learn More

Datasheet

100In Stock

$16.59

$13.16

$11.40

$11.03

View

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-1#PBF
Analog Devices
1: $13.42
84In Stock
728On Order

Mfr. Part #
LT8640EUDCF-1#PBF

Mouser Part #
584-LT8640EUDCF1PB

Analog Devices

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

Learn More

Datasheet

84In Stock

728On Order

$13.42

$10.78

$8.80

$8.65

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

LT8640EUDC#PBF
Analog Devices
1: $13.84
10,533On Order

Mfr. Part #
LT8640EUDC#PBF

Mouser Part #
584-LT8640EUDC#PBF

Analog Devices

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

Learn More

Datasheet

10,533On Order

$13.84

$10.90

$10.05

$9.23

View

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

LT8640HUDC#TRPBF
Analog Devices
1: $15.93
5,676Expected 5/19/2027

Mfr. Part #
LT8640HUDC#TRPBF

Mouser Part #
584-LT8640HUDC#TRPBF

Analog Devices

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

Learn More

Datasheet

5,676Expected 5/19/2027

Cut Tape

$15.93

$12.48

$11.53

$10.62

View

Reel

$9.43

MouseReel Available

Min.: 1
Mult.: 1

: 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 65V, 3.5A Sync Buck Silent Switcher w/ 2

LT8641EUDC#PBF
Analog Devices
1: $13.56
15,857On Order

Mfr. Part #
LT8641EUDC#PBF

Mouser Part #
584-LT8641EUDC#PBF

Analog Devices

Switching Voltage Regulators 65V, 3.5A Sync Buck Silent Switcher w/ 2

Learn More

Datasheet

15,857On Order

$13.56

$10.68

$9.21

$9.20

$9.14

Min.: 1
Mult.: 1
Max.: 1,547

SMD/SMT

QFN-18

Buck

810 mV to 64 V

3.5 A

1 Output

2.5 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8641

Tube

LT86x Synchronous Step-Down Silent Switchers

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