Voltage Regulators - Switching Regulators

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LTC3638 & LTC3639 Step-Down Regulators

Analog Devices Inc. LTC3638 and LTC3639 High-Efficiency Step-Down Regulators maintain a regulated output voltage at no load with an internal power switch at only 12μA typical DC supply current. The LTC3638 and LTC3639 incorporate low quiescent current, integrated power switch, Burst Mode^® operation, and programmable peak current limit creating high efficiency over a broad range of load currents. A programmable peak current limit creates a simple method for optimizing efficiency and for reducing output ripple and component size.

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Part #

Switching Voltage Regulators Hi Eff, 150V 100mA Sync Buck Reg

LTC3639EMSE#TRPBF
Analog Devices
1: $11.61
4,326In Stock

Mfr. Part No.
LTC3639EMSE#TRPBF

Mouser Part No
584-LTC3639EMSETRPBF

Analog Devices

Switching Voltage Regulators Hi Eff, 150V 100mA Sync Buck Reg

Learn More

Datasheet

4,326In Stock

Cut Tape

$11.61

$9.09

$8.47

$7.78

View

Reel

$7.05

MouseReel Available

Min.: 1
Mult.: 1

: 2,500

SMD/SMT

MSOP-16-12

Buck

800 mV to 150 V

100 mA

1 Output

12 uA

200 kHz

- 40 C

+ 125 C

LTC3639

Reel, Cut Tape, MouseReel

Switching Voltage Regulators Hi Eff, 140V 250mA Buck Reg

LTC3638EMSE#PBF
Analog Devices
1: $11.61
1,730In Stock

Mfr. Part No.
LTC3638EMSE#PBF

Mouser Part No
584-LTC3638EMSE#PBF

Analog Devices

Switching Voltage Regulators Hi Eff, 140V 250mA Buck Reg

Learn More

Datasheet

1,730In Stock

$11.61

$9.09

$8.25

$7.72

View

Min.: 1
Mult.: 1

SMD/SMT

MSOP-16-12

Buck

800 mV to 140 V

250 mA

1 Output

12 uA

Adjustable

- 40 C

+ 125 C

LTC3638

Tube

Switching Voltage Regulators Hi Eff, 150V 100mA Sync Buck Reg

LTC3639HMSE#PBF
Analog Devices
1: $13.32
488In Stock

Mfr. Part No.
LTC3639HMSE#PBF

Mouser Part No
584-LTC3639HMSE#PBF

Analog Devices

Switching Voltage Regulators Hi Eff, 150V 100mA Sync Buck Reg

Learn More

Datasheet

488In Stock

$13.32

$10.48

$9.52

$9.12

View

Min.: 1
Mult.: 1

SMD/SMT

MSOP-16-12

Buck

800 mV to 150 V

100 mA

1 Output

12 uA

200 kHz

- 40 C

+ 150 C

LTC3639

Tube

Switching Voltage Regulators Hi Eff, 150V 100mA Sync Buck Reg

LTC3639MPMSE#TRPBF
Analog Devices
1: $32.04
1,095In Stock

Mfr. Part No.
LTC3639MPMSE#TRPBF

Mouser Part No
584-C3639MPMSETRPBF

Analog Devices

Switching Voltage Regulators Hi Eff, 150V 100mA Sync Buck Reg

Learn More

Datasheet

1,095In Stock

Cut Tape

$32.04

$25.61

$24.00

$22.25

View

Reel

$19.91

MouseReel Available

Min.: 1
Mult.: 1

: 2,500

SMD/SMT

MSOP-16-12

Buck

800 mV to 150 V

100 mA

1 Output

12 uA

200 kHz

- 55 C

+ 150 C

LTC3639

Reel, Cut Tape, MouseReel

Switching Voltage Regulators Hi Eff, 150V 100mA Sync Buck Reg

LTC3639HMSE#TRPBF
Analog Devices
1: $13.32
2,190In Stock

Mfr. Part No.
LTC3639HMSE#TRPBF

Mouser Part No
584-LTC3639HMSETRPBF

Analog Devices

Switching Voltage Regulators Hi Eff, 150V 100mA Sync Buck Reg

Learn More

Datasheet

2,190In Stock

Cut Tape

$13.32

$10.48

$9.77

$8.99

View

Reel

$7.79

MouseReel Available

Min.: 1
Mult.: 1

: 2,500

SMD/SMT

MSOP-16-12

Buck

800 mV to 150 V

100 mA

1 Output

12 uA

200 kHz

- 40 C

+ 150 C

LTC3639

Reel, Cut Tape, MouseReel

Switching Voltage Regulators Hi Eff, 140V 250mA Buck Reg

LTC3638MPMSE#PBF
Analog Devices
1: $34.95
173In Stock

Mfr. Part No.
LTC3638MPMSE#PBF

Mouser Part No
584-LTC3638MPMSE#PBF

Analog Devices

Switching Voltage Regulators Hi Eff, 140V 250mA Buck Reg

Learn More

Datasheet

173In Stock

$34.95

$28.75

$25.38

$24.62

View

Min.: 1
Mult.: 1

SMD/SMT

MSOP-16-12

Buck

800 mV to 140 V

250 mA

1 Output

12 uA

Adjustable

- 55 C

+ 150 C

LTC3638

Tube

Switching Voltage Regulators Hi Eff, 140V 250mA Buck Reg

LTC3638EMSE#TRPBF
Analog Devices
1: $11.85
20In Stock
2,500Expected 2026/12/17

Mfr. Part No.
LTC3638EMSE#TRPBF

Mouser Part No
584-LTC3638EMSETRPBF

Analog Devices

Switching Voltage Regulators Hi Eff, 140V 250mA Buck Reg

Learn More

Datasheet

20In Stock

2,500Expected 2026/12/17

Cut Tape

$11.85

$9.28

$8.40

$7.78

View

Reel

$6.90

MouseReel Available

Min.: 1
Mult.: 1

: 2,500

SMD/SMT

MSOP-16-12

Buck

800 mV to 140 V

250 mA

1 Output

12 uA

Adjustable

- 40 C

+ 125 C

LTC3638

Reel, Cut Tape, MouseReel

Switching Voltage Regulators Hi Eff, 140V 250mA Buck Reg

LTC3638HMSE#PBF
Analog Devices
1: $13.32
72In Stock
111Expected 2027/01/07

Mfr. Part No.
LTC3638HMSE#PBF

Mouser Part No
584-LTC3638HMSE#PBF

Analog Devices

Switching Voltage Regulators Hi Eff, 140V 250mA Buck Reg

Learn More

Datasheet

72In Stock

111Expected 2027/01/07

$13.32

$10.48

$9.52

$8.93

View

Min.: 1
Mult.: 1

SMD/SMT

MSOP-16-12

Buck

800 mV to 140 V

250 mA

1 Output

12 uA

Adjustable

- 40 C

+ 150 C

LTC3638

Tube

Switching Voltage Regulators Hi Eff, 140V 250mA Buck Reg

LTC3638IMSE#PBF
Analog Devices
1: $12.63
6In Stock
74Expected 2026/12/10

Mfr. Part No.
LTC3638IMSE#PBF

Mouser Part No
584-LTC3638IMSE#PBF

Analog Devices

Switching Voltage Regulators Hi Eff, 140V 250mA Buck Reg

Learn More

Datasheet

6In Stock

74Expected 2026/12/10

$12.63

$9.92

$9.01

$8.46

$8.13

Min.: 1
Mult.: 1

SMD/SMT

MSOP-16-12

Buck

800 mV to 140 V

250 mA

1 Output

12 uA

Adjustable

- 40 C

+ 125 C

LTC3638

Tube

Switching Voltage Regulators Hi Eff, 150V 100mA Sync Buck Reg

LTC3639EMSE#PBF
Analog Devices
1: $11.85
36In Stock

Mfr. Part No.
LTC3639EMSE#PBF

Mouser Part No
584-LTC3639EMSE#PBF

Analog Devices

Switching Voltage Regulators Hi Eff, 150V 100mA Sync Buck Reg

Learn More

Datasheet

36In Stock

$11.85

$9.28

$8.47

$7.90

View

Min.: 1
Mult.: 1

SMD/SMT

MSOP-16-12

Buck

800 mV to 150 V

100 mA

1 Output

12 uA

200 kHz

- 40 C

+ 125 C

LTC3639

Tube

Switching Voltage Regulators Hi Eff, 150V 100mA Sync Buck Reg

LTC3639IMSE#PBF
Analog Devices
1: $12.63
286In Stock

Mfr. Part No.
LTC3639IMSE#PBF

Mouser Part No
584-LTC3639IMSE#PBF

Analog Devices

Switching Voltage Regulators Hi Eff, 150V 100mA Sync Buck Reg

Learn More

Datasheet

286In Stock

$12.63

$9.92

$9.01

$8.46

View

Min.: 1
Mult.: 1

SMD/SMT

MSOP-16-12

Buck

800 mV to 150 V

100 mA

1 Output

12 uA

200 kHz

- 40 C

+ 125 C

LTC3639

Tube

Switching Voltage Regulators Hi Eff, 150V 100mA Sync Buck Reg

LTC3639MPMSE#PBF
Analog Devices
1: $31.02
39In Stock
259Expected 2026/10/26

Mfr. Part No.
LTC3639MPMSE#PBF

Mouser Part No
584-LTC3639MPMSE#PBF

Analog Devices

Switching Voltage Regulators Hi Eff, 150V 100mA Sync Buck Reg

Learn More

Datasheet

39In Stock

259Expected 2026/10/26

$31.02

$25.09

$23.07

$21.85

Min.: 1
Mult.: 1

SMD/SMT

MSOP-16-12

Buck

800 mV to 150 V

100 mA

1 Output

12 uA

200 kHz

- 55 C

+ 150 C

LTC3639

Tube

Switching Voltage Regulators Hi Eff, 140V 250mA Buck Reg

LTC3638MPMSE#TRPBF
Analog Devices
2,500: $22.48
Non-Stocked Lead-Time 14 Weeks

Mfr. Part No.
LTC3638MPMSE#TRPBF

Mouser Part No
584-C3638MPMSETRPBF

Analog Devices

Switching Voltage Regulators Hi Eff, 140V 250mA Buck Reg

Learn More

Datasheet

Non-Stocked Lead-Time 14 Weeks

Reel

$22.48

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

: 2,500

SMD/SMT

MSOP-16-12

Buck

800 mV to 140 V

250 mA

1 Output

12 uA

- 55 C

+ 150 C

LTC3638

Reel

Switching Voltage Regulators Hi Eff, 140V 250mA Buck Reg

LTC3638HMSE#TRPBF
Analog Devices
2,500: $7.90
Non-Stocked Lead-Time 27 Weeks

Mfr. Part No.
LTC3638HMSE#TRPBF

Mouser Part No
584-LTC3638HMSETRPBF

Analog Devices

Switching Voltage Regulators Hi Eff, 140V 250mA Buck Reg

Learn More

Datasheet

Non-Stocked Lead-Time 27 Weeks

Reel

$7.90

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

: 2,500

SMD/SMT

MSOP-16-12

Buck

800 mV to 140 V

250 mA

1 Output

12 uA

- 40 C

+ 150 C

LTC3638

Reel

Switching Voltage Regulators Hi Eff, 140V 250mA Buck Reg

LTC3638IMSE#TRPBF
Analog Devices
1: $12.63
Non-Stocked Lead-Time 28 Weeks

Mfr. Part No.
LTC3638IMSE#TRPBF

Mouser Part No
584-LTC3638IMSETRPBF

Analog Devices

Switching Voltage Regulators Hi Eff, 140V 250mA Buck Reg

Learn More

Datasheet

Non-Stocked Lead-Time 28 Weeks

Cut Tape

$12.63

$9.92

$9.26

$8.50

View

Reel

$7.57

MouseReel Available

Min.: 1
Mult.: 1

: 2,500

SMD/SMT

MSOP-16-12

Buck

800 mV to 140 V

250 mA

1 Output

12 uA

- 40 C

+ 125 C

LTC3638

Reel, Cut Tape, MouseReel

Switching Voltage Regulators Hi Eff, 150V 100mA Sync Buck Reg

LTC3639IMSE#TRPBF
Analog Devices
1: $12.63
Non-Stocked Lead-Time 28 Weeks

Mfr. Part No.
LTC3639IMSE#TRPBF

Mouser Part No
584-LTC3639IMSETRPBF

Analog Devices

Switching Voltage Regulators Hi Eff, 150V 100mA Sync Buck Reg

Learn More

Datasheet

Non-Stocked Lead-Time 28 Weeks

Cut Tape

$12.63

$9.92

$9.26

$8.50

View

Reel

$7.56

MouseReel Available

Min.: 1
Mult.: 1

: 2,500

SMD/SMT

MSOP-16-12

Buck

800 mV to 150 V

100 mA

1 Output

12 uA

200 kHz

- 40 C

+ 125 C

LTC3639

Reel

LTC3638 & LTC3639 Step-Down Regulators

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