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: 70,57 RON
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

70,57 RON

55,38 RON

53,07 RON

46,78 RON

44,47 RON

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: 75,85 RON
11.385In 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

11.385In Stock

75,85 RON

61,27 RON

58,75 RON

51,76 RON

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: 77,61 RON
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

77,61 RON

62,72 RON

60,11 RON

52,97 RON

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: 74,29 RON
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

74,29 RON

58,30 RON

55,88 RON

49,29 RON

46,83 RON

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: 74,29 RON
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

74,29 RON

58,30 RON

55,88 RON

49,29 RON

46,83 RON

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

LT8640IUDCF-1#TRPBF
Analog Devices
1: 70,57 RON
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

70,57 RON

55,38 RON

53,07 RON

46,78 RON

44,47 RON

Reel

44,47 RON

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

LT8640EUDCF#PBF
Analog Devices
1: 69,67 RON
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

69,67 RON

54,68 RON

52,41 RON

46,18 RON

43,91 RON

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#WPBF
Analog Devices
1: 81,23 RON
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

81,23 RON

65,64 RON

62,93 RON

55,48 RON

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#PBF
Analog Devices
1: 70,57 RON
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

70,57 RON

55,38 RON

53,07 RON

46,78 RON

44,47 RON

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

LT8640EUDCF-1#PBF
Analog Devices
1: 65,44 RON
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

65,44 RON

49,70 RON

47,73 RON

42,00 RON

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#PBF
Analog Devices
1: 74,34 RON
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

74,34 RON

60,11 RON

57,64 RON

50,75 RON

Quote

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-1#TRPBF
Analog Devices
1: 66,25 RON
1.963In 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

1.963In Stock

Cut Tape

66,25 RON

50,30 RON

48,24 RON

42,50 RON

40,39 RON

Reel

40,39 RON

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

LT8640IUDC-1#TRPBF
Analog Devices
1: 70,57 RON
2.159In 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

2.159In Stock

Cut Tape

70,57 RON

55,38 RON

53,07 RON

46,78 RON

44,47 RON

Reel

44,47 RON

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: 66,25 RON
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

66,25 RON

50,30 RON

48,24 RON

42,50 RON

40,39 RON

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: 66,25 RON
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

66,25 RON

50,30 RON

48,24 RON

42,50 RON

40,39 RON

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: 70,57 RON
3.778In 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

3.778In Stock

Cut Tape

70,57 RON

55,38 RON

53,07 RON

46,78 RON

44,47 RON

Reel

44,47 RON

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: 67,65 RON
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

67,65 RON

53,07 RON

50,90 RON

44,87 RON

42,65 RON

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: 67,65 RON
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

67,65 RON

53,07 RON

50,90 RON

44,87 RON

42,65 RON

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#TRPBF
Analog Devices
1: 66,25 RON
1.048In Stock
2.490Expected 2/16/2026

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 2/16/2026

Cut Tape

66,25 RON

50,30 RON

48,24 RON

42,50 RON

40,39 RON

Reel

40,39 RON

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: 74,09 RON
438In Stock
273Expected 4/17/2026

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 4/17/2026

74,09 RON

58,15 RON

55,78 RON

49,09 RON

46,73 RON

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: 74,09 RON
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

74,09 RON

58,15 RON

55,78 RON

49,09 RON

46,73 RON

Reel

46,73 RON

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: 70,57 RON
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

70,57 RON

55,38 RON

53,07 RON

46,78 RON

44,47 RON

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: 74,09 RON
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

74,09 RON

58,15 RON

55,78 RON

49,09 RON

46,73 RON

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: 88,78 RON
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

88,78 RON

73,49 RON

70,47 RON

62,07 RON

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: 74,34 RON
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

74,34 RON

60,11 RON

57,64 RON

50,75 RON

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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