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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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (CHF) Filter the results in the table by unit price based on your quantity.	Qty.	Mounting Style	Package/Case	Topology	Output Voltage	Output Current	Number of Outputs	Quiescent Current	Switching Frequency	Minimum Operating Temperature	Maximum Operating Temperature	Qualification	Series	Packaging
Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5 LT8640JUDCF#PBF Analog Devices 1: CHF 14.56 7’013In 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 about Analog Devices adi lt8640 regulators	Datasheet	7’013In Stock	CHF 14.56 CHF 11.40 CHF 10.58 CHF 9.74 View CHF 9.64 CHF 9.08 CHF 8.88 Quote	Min.: 1 Mult.: 1 Max.: 5’679	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#TRPBF Analog Devices 1: CHF 13.00 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 about Analog Devices adi lt8640 regulators	Datasheet	5’694In Stock	Cut Tape CHF 13.00 CHF 10.30 CHF 9.62 CHF 8.91 View Reel CHF 7.75 CHF 8.39 CHF 8.19 CHF 7.75 MouseReel Available	Min.: 1 Mult.: 1 Max.: 4’555 : 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: CHF 13.26 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 about Analog Devices adi lt8640 regulators	Datasheet	175In Stock	CHF 13.26 CHF 10.39 CHF 9.68 CHF 8.88	Min.: 1 Mult.: 1 Max.: 140	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-1#PBF Analog Devices 1: CHF 13.43 179In 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 about Analog Devices adi lt8640 regulators	Datasheet	179In Stock	CHF 13.43 CHF 10.52 CHF 9.80 CHF 8.99	Min.: 1 Mult.: 1 Max.: 159	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-1#PBF Analog Devices 1: CHF 14.07 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 about Analog Devices adi lt8640 regulators	Datasheet	91In Stock	CHF 14.07 CHF 11.15 CHF 10.43 CHF 9.62 View CHF 9.17 CHF 9.00	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 LT8640EUDCF-1#PBF Analog Devices 1: CHF 11.77 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 about Analog Devices adi lt8640 regulators	Datasheet	84In Stock 728On Order	CHF 11.77 CHF 9.37 CHF 8.41 CHF 7.77 View CHF 7.64 CHF 7.45 CHF 7.31 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#PBF Analog Devices 1: CHF 12.21 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 about Analog Devices adi lt86 silent switchers	Datasheet	1’913In Stock	CHF 12.21 CHF 9.57 CHF 8.90 CHF 8.16 View CHF 8.09 CHF 7.62 CHF 7.44	Min.: 1 Mult.: 1 Max.: 1’530	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#TRPBF Analog Devices 1: CHF 11.49 3’259In 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 about Analog Devices adi lt8640 regulators	Datasheet	3’259In Stock	Cut Tape CHF 11.49 CHF 9.06 CHF 8.44 CHF 7.78 View Reel CHF 7.07 CHF 7.75 CHF 7.50 CHF 7.27 CHF 7.07 MouseReel Available	Min.: 1 Mult.: 1 Max.: 2’728 : 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 LT8640IUDC#PBF Analog Devices 1: CHF 12.54 2’991In 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 about Analog Devices adi lt86 silent switchers	Datasheet	2’991In Stock	CHF 12.54 CHF 9.91 CHF 8.56 CHF 8.28 View CHF 8.13 CHF 7.94 CHF 7.79	Min.: 1 Mult.: 1 Max.: 2’392	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: CHF 13.43 5’435In 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 about Analog Devices adi lt8640 regulators	Datasheet	5’435In Stock	CHF 13.43 CHF 10.62 CHF 9.92 CHF 9.15 View CHF 8.78 CHF 8.55	Min.: 1 Mult.: 1 Max.: 4’872	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-1#TRPBF Analog Devices 1: CHF 12.21 941In 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 about Analog Devices adi lt8640 regulators	Datasheet	941In Stock	Cut Tape CHF 12.21 CHF 9.57 CHF 8.89 CHF 8.17 View CHF 8.10 CHF 7.98 CHF 7.98 MouseReel Available	Min.: 1 Mult.: 1 Max.: 770	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: CHF 12.54 1’030In 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 about Analog Devices adi lt8640 regulators	Datasheet	1’030In Stock	Cut Tape CHF 12.54 CHF 9.91 CHF 9.25 CHF 8.53 View CHF 8.52 CHF 8.26 CHF 8.26 MouseReel Available	Min.: 1 Mult.: 1 Max.: 824	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: CHF 13.60 886In 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 about Analog Devices adi lt86 silent switchers	Datasheet	886In Stock 3’830On Order On Order Ship Dates Mfr. No: LT8640HUDC#PBF Stock: 886 Can Dispatch Immediately On Order: 3’739 Pending 91 Expected 11/13/2026 Factory Lead Time: Unverified	CHF 13.60 CHF 10.78 CHF 10.08 CHF 9.29 View CHF 8.86 CHF 8.71	Min.: 1 Mult.: 1 Max.: 708	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 LT8640HUDCF#PBF Analog Devices 1: CHF 17.03 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 about Analog Devices adi lt8640 regulators	Datasheet	52In Stock	CHF 17.03 CHF 13.54 CHF 12.26 CHF 11.56 View CHF 11.19 CHF 10.97 CHF 10.96	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: CHF 13.86 91In 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 about Analog Devices adi lt8640 regulators	Datasheet	91In Stock 1’001On Order	CHF 13.86 CHF 10.91 CHF 9.85 CHF 9.25 View CHF 9.13 CHF 8.74 CHF 8.63 Quote	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 LT8640IUDC-1#PBF Analog Devices 1: CHF 13.43 41In 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 about Analog Devices adi lt86 silent switchers	Datasheet	41In Stock	CHF 13.43 CHF 10.52 CHF 9.79 CHF 8.99 View CHF 8.89 CHF 8.37 CHF 8.19 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 LT8640IUDCF#PBF Analog Devices 1: CHF 13.51 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 about Analog Devices adi lt8640 regulators	Datasheet	25In Stock 1’820On Order	CHF 13.51 CHF 10.70 CHF 9.27 CHF 8.96 View CHF 8.82 CHF 8.55 CHF 8.37 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 LT8640JUDCF#WPBF Analog Devices 1: CHF 15.36 76In 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 about Analog Devices adi lt8640 regulators	Datasheet	76In Stock	CHF 15.36 CHF 12.17 CHF 11.38 CHF 10.49 View CHF 10.02 CHF 9.83	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 LT8640JUDCF-1#WPBF Analog Devices 1: CHF 14.70 113In 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 about Analog Devices adi lt8640 regulators	Datasheet	113In Stock	CHF 14.70 CHF 11.64 CHF 10.90	Min.: 1 Mult.: 1 Max.: 90	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

LT8640/LT8640-1 Step-Down Regulators

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