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#PBF
Analog Devices
1: Rp303.443
7.099In 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

7.099In Stock

Rp303.443

Rp240.700

Rp208.227

Rp197.953

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

LT8640JUDCF#WPBF
Analog Devices
1: Rp315.735
167In 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

167In Stock

Rp315.735

Rp244.919

Rp225.656

Rp204.558

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: Rp271.337
5.694In 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

5.694In Stock

Cut Tape

Rp271.337

Rp214.281

Rp197.403

Rp184.377

View

Reel

Rp160.528

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

LT8640IUDCF-1#PBF
Analog Devices
1: Rp271.521
199In 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

199In Stock

Rp271.521

Rp214.465

Rp185.295

Rp182.726

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

LT8640EUDCF#PBF
Analog Devices
1: Rp268.219
175In 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

175In Stock

Rp268.219

Rp211.713

Rp180.341

Rp173.370

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: Rp282.895
91In 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

91In Stock

Rp282.895

Rp214.281

Rp194.101

Rp171.168

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, 5A Sync Buck Silent Switcher w/ 2.5

LT8640EUDC#TRPBF
Analog Devices
1: Rp248.772
5.483In Stock

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

5.483In Stock

Cut Tape

Rp248.772

Rp195.935

Rp182.726

Rp168.233

View

Reel

Rp145.851

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: Rp248.772
1.913In 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

1.913In Stock

Rp248.772

Rp195.935

Rp168.967

Rp163.279

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: Rp271.521
5.996In 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

5.996In Stock

Rp271.521

Rp214.465

Rp185.295

Rp179.240

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, 6A Sync Buck Silent Switcher 2 w/ 2

LT8640SEV-2#PBF
Analog Devices
1: Rp266.567
7.184In 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

7.184In Stock

Rp266.567

Rp210.245

Rp196.119

Rp180.708

View

Min.: 1
Mult.: 1
Max.: 540

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

LT8640SHV-2#PBF
Analog Devices
1: Rp307.662
4.989In 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

4.989In Stock

Rp307.662

Rp240.883

Rp224.188

Rp206.026

View

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

LT8640EUDC-1#TRPBF
Analog Devices
1: Rp248.772
1.268In Stock
2.500Expected 26/03/2027

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

1.268In Stock

2.500Expected 26/03/2027

Cut Tape

Rp248.772

Rp195.935

Rp182.726

Rp168.233

View

Reel

Rp149.887

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: Rp271.521
862In 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

862In Stock

Cut Tape

Rp271.521

Rp214.465

Rp200.155

Rp184.561

View

Reel

Rp160.528

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: Rp283.813
835In Stock
3.830On Order

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

835In Stock

3.830On Order

Rp283.813

Rp224.555

Rp194.284

Rp187.863

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#TRPBF
Analog Devices
1: Rp271.521
290In Stock
2.500Expected 07/04/2027

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

290In Stock

2.500Expected 07/04/2027

Cut Tape

Rp271.521

Rp214.465

Rp200.155

Rp184.561

View

Reel

Rp168.233

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

LT8640HUDC-1#PBF
Analog Devices
1: Rp292.252
57In Stock
1.001On Order

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

57In Stock

1.001On Order

Rp292.252

Rp229.142

Rp212.997

Rp187.313

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: Rp351.509
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

Rp351.509

Rp279.960

Rp243.451

Rp235.746

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#PBF
Analog Devices
1: Rp271.521
133In 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

133In Stock

Rp271.521

Rp214.465

Rp198.320

Rp179.240

Rp176.122

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: Rp292.435
25In Stock
1.820On Order

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

25In Stock

1.820On Order

Rp292.435

Rp231.527

Rp200.522

Rp193.917

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: Rp304.360
100In 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

100In Stock

Rp304.360

Rp241.433

Rp209.144

Rp202.356

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, 6A Synchronous Step-Down Silent Swi

LT8640SAAV#PBF
Analog Devices
1: Rp261.247
1.073Expected 04/03/2027
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

1.073Expected 04/03/2027

Rp261.247

Rp206.209

Rp192.266

Rp177.222

Rp169.884

Min.: 1
Mult.: 1
Max.: 250

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, 6A Sync Buck Silent Switcher 2 w/ 2

LT8640SIV-2#PBF
Analog Devices
1: Rp284.546
15In Stock
10.260On Order

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

15In Stock

10.260On Order

Rp284.546

Rp229.692

Rp210.245

Rp193.917

View

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

LT8640EUDCF-1#PBF
Analog Devices
1: Rp246.203
84In Stock
728On Order

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

84In Stock

728On Order

Rp246.203

Rp197.770

Rp182.176

Rp161.445

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: Rp253.909
10.533On Order

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

10.533On Order

Rp253.909

Rp199.971

Rp184.377

Rp169.334

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: Rp292.252
5.676Expected 28/04/2027

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

5.676Expected 28/04/2027

Cut Tape

Rp292.252

Rp228.958

Rp211.529

Rp194.835

View

Reel

Rp173.003

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

LT8640/LT8640-1 Step-Down Regulators

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