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

LT8640JUDCF-1#WPBF
Analog Devices
1: $17.97
128In Stock

Mfr. Part No.
LT8640JUDCF-1#WPBF

Mouser Part No
584-LT8640JUDCF1WPBF

Analog Devices

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

Learn More

Datasheet

128In Stock

$17.97

$14.51

$13.92

$12.26

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, 6A Synchronous Step-Down Silent Swi

LT8640SAAV#PBF
Analog Devices
1: $15.64
540Expected 2026/07/08
New Product

Mfr. Part No.
LT8640SAAV#PBF

Mouser Part No
584-LT8640SAAVPBF

New Product

Analog Devices

Switching Voltage Regulators 42V, 6A Synchronous Step-Down Silent Swi

Learn More

Datasheet

540Expected 2026/07/08

$15.64

$12.27

$11.77

$10.37

$9.86

Min.: 1
Mult.: 1

SMD/SMT

QFN-24

Buck

6 A

1 Output

1.7 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640S

Tray

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

LT8640EUDCF-1#TRPBF
Analog Devices
2,500: $9.23
Non-Stocked Lead-Time 10 Weeks

Mfr. Part No.
LT8640EUDCF-1#TRPBF

Mouser Part No
584-LT8640EUDCF1TRPB

Analog Devices

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

Learn More

Datasheet

Non-Stocked Lead-Time 10 Weeks

Reel

$9.23

Min.: 2,500
Mult.: 2,500

Reel: 2,500

SMD/SMT

QFN-18

1 Output

LT8640

Reel

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

LT8640EUDCF#TRPBF
Analog Devices
2,500: $10.15
Non-Stocked Lead-Time 10 Weeks

Mfr. Part No.
LT8640EUDCF#TRPBF

Mouser Part No
584-LT8640EUDCFTRPBF

Analog Devices

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

Learn More

Datasheet

Non-Stocked Lead-Time 10 Weeks

Reel

$10.15

Min.: 2,500
Mult.: 2,500

Reel: 2,500

SMD/SMT

QFN-18

1 Output

LT8640

Reel

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

LT8640HUDC-1#TRPBF
Analog Devices
2,500: $10.80
Non-Stocked Lead-Time 10 Weeks

Mfr. Part No.
LT8640HUDC-1#TRPBF

Mouser Part No
584-LT8640HUDC1TRPBF

Analog Devices

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

Learn More

Datasheet

Non-Stocked Lead-Time 10 Weeks

Reel

$10.80

Min.: 2,500
Mult.: 2,500

Reel: 2,500

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

Reel

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

LT8640HUDCF#TRPBF
Analog Devices
2,500: $14.35
Non-Stocked Lead-Time 10 Weeks

Mfr. Part No.
LT8640HUDCF#TRPBF

Mouser Part No
584-LT8640HUDCFTRPBF

Analog Devices

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

Learn More

Datasheet

Non-Stocked Lead-Time 10 Weeks

Reel

$14.35

Min.: 2,500
Mult.: 2,500

Reel: 2,500

SMD/SMT

QFN-18

1 Output

LT8640

Reel

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

LT8640IUDCF#TRPBF
Analog Devices
2,500: $11.73
Non-Stocked Lead-Time 10 Weeks

Mfr. Part No.
LT8640IUDCF#TRPBF

Mouser Part No
584-LT8640IUDCFTRPBF

Analog Devices

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

Learn More

Datasheet

Non-Stocked Lead-Time 10 Weeks

Reel

$11.73

Min.: 2,500
Mult.: 2,500

Reel: 2,500

SMD/SMT

QFN-18

1 Output

LT8640

Reel

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

LT8640JUDCF-1#TRPBF
Analog Devices
2,500: $11.73
Non-Stocked Lead-Time 10 Weeks

Mfr. Part No.
LT8640JUDCF-1#TRPBF

Mouser Part No
584-LT8640JUDCF1TRPB

Analog Devices

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

Learn More

Datasheet

Non-Stocked Lead-Time 10 Weeks

Reel

$11.73

Min.: 2,500
Mult.: 2,500

Reel: 2,500

SMD/SMT

QFN-18

1 Output

LT8640

Reel

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

LT8640JUDCF-1#WTRPBF
Analog Devices
2,500: $12.26
Non-Stocked Lead-Time 10 Weeks

Mfr. Part No.
LT8640JUDCF-1#WTRPBF

Mouser Part No
584-LT8640JUDCF1WTRP

Analog Devices

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

Learn More

Datasheet

Non-Stocked Lead-Time 10 Weeks

Reel

$12.26

Min.: 2,500
Mult.: 2,500

Reel: 2,500

SMD/SMT

QFN-18

1 Output

AEC-Q100

LT8640

Reel

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

LT8640JUDCF#TRPBF
Analog Devices
2,500: $12.25
Non-Stocked Lead-Time 10 Weeks

Mfr. Part No.
LT8640JUDCF#TRPBF

Mouser Part No
584-LT8640JUDCFTRPBF

Analog Devices

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

Learn More

Datasheet

Non-Stocked Lead-Time 10 Weeks

Reel

$12.25

Min.: 2,500
Mult.: 2,500

Reel: 2,500

SMD/SMT

QFN-18

1 Output

LT8640

Reel

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

LT8640JUDCF#WTRPBF
Analog Devices
2,500: $12.83
Non-Stocked Lead-Time 10 Weeks

Mfr. Part No.
LT8640JUDCF#WTRPBF

Mouser Part No
584-LT8640JUDCFWTRPB

Analog Devices

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

Learn More

Datasheet

Non-Stocked Lead-Time 10 Weeks

Reel

$12.83

Min.: 2,500
Mult.: 2,500

Reel: 2,500

SMD/SMT

QFN-18

1 Output

AEC-Q100

LT8640

Reel

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

LT8640SEV#TRPBF
Analog Devices
2,500: $9.86
Non-Stocked Lead-Time 10 Weeks

Mfr. Part No.
LT8640SEV#TRPBF

Mouser Part No
584-LT8640SEV#TRPBF

Analog Devices

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

Learn More

Datasheet

Non-Stocked Lead-Time 10 Weeks

Reel

$9.86

Min.: 2,500
Mult.: 2,500

Reel: 2,500

SMD/SMT

LQFN-24

Buck

6 A

1 Output

250 nA

1.95 MHz

- 40 C

+ 125 C

LT8640S

Reel

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

LT8640SIV#TRPBF
Analog Devices
2,500: $10.83
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
LT8640SIV#TRPBF

Mouser Part No
584-LT8640SIV#TRPBF

Analog Devices

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

Learn More

Datasheet

Non-Stocked Lead-Time 12 Weeks

Reel

$10.83

Min.: 2,500
Mult.: 2,500

Reel: 2,500

SMD/SMT

LQFN-24

Buck

3.3 V to 25 V

6 A

1 Output

750 nA

1.95 MHz

- 40 C

+ 125 C

LT8640S

Reel

Switching Voltage Regulators 42V, 6A Synchronous Step-Down Silent Swi

LT8640SAAV#TRPBF
Analog Devices
2,500: $9.86
Non-Stocked Lead-Time 15 Weeks
New Product

Mfr. Part No.
LT8640SAAV#TRPBF

Mouser Part No
584-LT8640SAAVTRPBF

New Product

Analog Devices

Switching Voltage Regulators 42V, 6A Synchronous Step-Down Silent Swi

Learn More

Datasheet

Non-Stocked Lead-Time 15 Weeks

Reel

$9.86

Min.: 2,500
Mult.: 2,500

Reel: 2,500

SMD/SMT

QFN-24

Buck

6 A

1 Output

1.7 uA

200 kHz to 3 MHz

- 40 C

+ 125 C

LT8640S

Reel

LT8640/LT8640-1 Step-Down Regulators

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