Integrated Circuits (ICs)

LT8640JUDCF#WPBF

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DC-DC SWITCHING SYNCHRONOUS BUCK REGULATOR, ADJUSTABLE, 3.4 TO 42V IN, 0.97V/5A OUT, QFN-EP-18

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DocumentsPackage Drawing - 20(18)-Lead Plastic Side Wettable QFN (3mm × 4mm)LT8640/LT8640-1: 42V, 5A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current Data Sheet (Rev.G)+2

Integrated Circuits (ICs)

LT8640JUDCF#WPBF

Active

Analog Devices Inc./Maxim Integrated

DC-DC SWITCHING SYNCHRONOUS BUCK REGULATOR, ADJUSTABLE, 3.4 TO 42V IN, 0.97V/5A OUT, QFN-EP-18

Deep-Dive with AI

DocumentsPackage Drawing - 20(18)-Lead Plastic Side Wettable QFN (3mm × 4mm)LT8640/LT8640-1: 42V, 5A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current Data Sheet (Rev.G)+2

Specifications Series Pricing Description Documents

Technical Specifications

Parameters and characteristics for this part

Specification	LT8640JUDCF#WPBF

Current - Output	5 A
Frequency - Switching [Max]	2 MHz
Frequency - Switching [Min]	210 kHz
Function	Step-Down
Grade	Automotive
Mounting Type	Wettable Flank, Surface Mount
Number of Outputs	1
Operating Temperature [Max]	150 °C
Operating Temperature [Min]	-40 °C
Output Configuration	Positive
Output Type	Adjustable
Package / Case	20-WFQFN, 18 Leads, Exposed Pad
Qualification	AEC-Q100
Supplier Device Package	20-QFN (3x4)
Synchronous Rectifier	True
Topology	Buck
Voltage - Input (Max) [Max]	42 V
Voltage - Input (Min) [Min]	3.4 V
Voltage - Output (Max) [Max]	42 V
Voltage - Output (Min/Fixed) [Min]	0.97 V

LT8640LT8640-1 Series

42V, 5A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current

Part	Mounting Type	Package / Case	Function	Qualification	Grade	Output Type	Operating Temperature [Min]	Operating Temperature [Max]	Topology	Voltage - Input (Min) [Min]	Voltage - Input (Max) [Max]	Number of Outputs	Frequency - Switching [Max]	Frequency - Switching [Min]	Voltage - Output (Max) [Max]	Voltage - Output (Min/Fixed) [Min]	Supplier Device Package	Current - Output	Output Configuration
Analog Devices Inc./Maxim Integrated LT8640JUDCF-1#WPBF	Surface Mount Wettable Flank	20-WFQFN 18 Leads Exposed Pad	Step-Down	AEC-Q100	Automotive	Adjustable	-40 °C	150 °C	Buck	3.4 V	42 V	1	2 MHz	210 kHz	42 V	0.97 V	20-QFN (3x4)	5 A	Positive
Analog Devices Inc./Maxim Integrated LT8640JUDCF-1#PBF	Surface Mount Wettable Flank	20-WFQFN 18 Leads Exposed Pad	Step-Down			Adjustable	-40 °C	150 °C	Buck	3.4 V	42 V	1	2 MHz	210 kHz	42 V	0.97 V	20-QFN (3x4)	5 A	Positive
Analog Devices Inc./Maxim Integrated LT8640HUDCF#PBF	Surface Mount Wettable Flank	20-WFQFN 18 Leads Exposed Pad	Step-Down			Adjustable	-40 °C	150 °C	Buck	3.4 V	42 V	1	2 MHz	210 kHz	42 V	0.97 V	20-QFN (3x4)	5 A	Positive
Analog Devices Inc./Maxim Integrated LT8640HUDC#PBF	Surface Mount	20-WFQFN 18 Leads Exposed Pad	Step-Down			Adjustable	-40 °C	150 °C	Buck	3.4 V	42 V	1	2 MHz	210 kHz	42 V	0.97 V	20-QFN (3x4)	5 A	Positive
Analog Devices Inc./Maxim Integrated LT8640HUDC-1#TRPBF	Surface Mount	20-WFQFN 18 Leads Exposed Pad	Step-Down			Adjustable	-40 °C	150 °C	Buck	3.4 V	42 V	1	2 MHz	210 kHz	42 V	0.97 V	20-QFN (3x4)	5 A	Positive
Analog Devices Inc./Maxim Integrated LT8640JUDCF#PBF	Surface Mount Wettable Flank	20-WFQFN 18 Leads Exposed Pad	Step-Down			Adjustable	-40 C	125 °C	Buck	3.4 V	42 V	1	2 MHz	210 kHz	42 V	0.97 V	20-QFN (3x4)	5 A	Positive
Analog Devices Inc./Maxim Integrated LT8640JUDCF#WPBF	Surface Mount Wettable Flank	20-WFQFN 18 Leads Exposed Pad	Step-Down	AEC-Q100	Automotive	Adjustable	-40 °C	150 °C	Buck	3.4 V	42 V	1	2 MHz	210 kHz	42 V	0.97 V	20-QFN (3x4)	5 A	Positive
Analog Devices Inc./Maxim Integrated LT8640EUDCF-1#PBF	Surface Mount Wettable Flank	20-WFQFN 18 Leads Exposed Pad	Step-Down			Adjustable	-40 C	125 °C	Buck	3.4 V	42 V	1	2 MHz	210 kHz	42 V	0.97 V	20-QFN (3x4)	5 A	Positive
Analog Devices Inc./Maxim Integrated LT8640EUDC#PBF	Surface Mount	20-WFQFN 18 Leads Exposed Pad	Step-Down			Adjustable	-40 C	125 °C	Buck	3.4 V	42 V	1	2 MHz	210 kHz	42 V	0.97 V	20-QFN (3x4)	5 A	Positive
Analog Devices Inc./Maxim Integrated LT8640HUDCF#TRPBF	Surface Mount Wettable Flank	20-WFQFN 18 Leads Exposed Pad	Step-Down			Adjustable	-40 °C	150 °C	Buck	3.4 V	42 V	1	2 MHz	210 kHz	42 V	0.97 V	20-QFN (3x4)	5 A	Positive

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$	Updated

Digikey	N/A	72	$ 15.86	1m+
Newark	Each	1	$ 12.69	1m+
		10	$ 9.78
		25	$ 9.47
		50	$ 8.98
		182	$ 8.66

Description

General part information

LT8640LT8640-1 Series

The LT8640/LT8640-1 step-down regulator features Silent Switcher architecture designed to minimize EMI 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 highest efficiency at very small load currents.The LT8640/LT8640-1 allows high VINto low VOUTconversion 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).PackageSYNC/MODE ≠ 0VCCOMPH-GRADECLKOUTINTERNAL CAPSLT8640QFNPulse-SkippingInternalYesNoNoLT8640-1QFNFCMInternalYesNoNoLT8640SLQFNFCMInternalNoYesYesLT8643SLQFNFCMExternalNoYesYesLT8640S-2LQFNFCMInternalYesYesNoLT8643S-2LQFNFCMExternalYesYesNoApplicationsAutomotive and Industrial SuppliesGeneral Purpose Step-DownGSM Power Supplies

Documents

Technical documentation and resources

Package Drawing - 20(18)-Lead Plastic Side Wettable QFN (3mm × 4mm)

Package Drawing

LT8640/LT8640-1: 42V, 5A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current Data Sheet (Rev.G)

Data Sheet

R570 Reliability Data

Reliability Data

LT8640JUDCF#WPBF | Datasheet

Datasheet