LT8640AJUDCM-3.3#TRPBF

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Analog Devices

42V, 5A/8A PEAK SYNCHRONOUS STEP-DOWN SILENT SWITCHER WITH 2.5ΜA QUIESCENT CURRENT

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DocumentsDatasheet Package Drawing - 20(18)-Lead Plastic Side Wettable QFN (3mm × 4mm)+2

LT8640AJUDCM-3.3#TRPBF

Active

Analog Devices

42V, 5A/8A PEAK SYNCHRONOUS STEP-DOWN SILENT SWITCHER WITH 2.5ΜA QUIESCENT CURRENT

Deep-Dive with AI

DocumentsDatasheet Package Drawing - 20(18)-Lead Plastic Side Wettable QFN (3mm × 4mm)+2

Specifications Pricing Series Description Documents

Technical Specifications

Parameters and characteristics for this part

Specification	LT8640AJUDCM-3.3#TRPBF

Current - Output	5 A
Frequency - Switching [Max]	3 MHz
Frequency - Switching [Min]	200 kHz
Function	Step-Down
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	1.81 mOhm
Package / Case	20-WFQFN Exposed Pad, 18 Leads
Supplier Device Package	20-QFN (3x4)
Synchronous Rectifier	True
Topology	Buck
Voltage - Input (Max) [Max]	42 V
Voltage - Input (Min) [Min]	2.9 V
Voltage - Output (Min/Fixed)	3.3 V

LT8640LT8640-1 Series

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

Part	Number of Outputs	Topology	Supplier Device Package	Current - Output	Voltage - Input (Max) [Max]	Function	Output Type	Voltage - Input (Min) [Min]	Voltage - Output (Max) [Max]	Frequency - Switching [Max]	Frequency - Switching [Min]	Voltage - Output (Min/Fixed) [Min]	Mounting Type	Output Configuration	Operating Temperature [Max]	Operating Temperature [Min]	Package / Case	Voltage - Output (Min/Fixed)	Output Type
Analog Devices LT8640HUDC-1#TRPBF	1	Buck	20-QFN (3x4)	5 A	42 V	Step-Down	Adjustable	3.4 V	42 V	2 MHz	210 kHz	0.97 V	Surface Mount	Positive	150 °C	-40 °C	18 Leads 20-WFQFN Exposed Pad
Analog Devices LT8640JUDCF#PBF	1	Buck	20-QFN (3x4)	5 A	42 V	Step-Down	Adjustable	3.4 V	42 V	2 MHz	210 kHz	0.97 V	Surface Mount Wettable Flank	Positive	125 ¯C	-40 °C	18 Leads 20-WFQFN Exposed Pad
Analog Devices LT8640EUDCF-1#PBF	1	Buck	20-QFN (3x4)	5 A	42 V	Step-Down	Adjustable	3.4 V	42 V	2 MHz	210 kHz	0.97 V	Surface Mount Wettable Flank	Positive	125 ¯C	-40 °C	18 Leads 20-WFQFN Exposed Pad
Analog Devices LT8640EUDC#PBF	1	Buck	20-QFN (3x4)	5 A	42 V	Step-Down	Adjustable	3.4 V	42 V	2 MHz	210 kHz	0.97 V	Surface Mount	Positive	125 ¯C	-40 °C	18 Leads 20-WFQFN Exposed Pad
Analog Devices LT8640HUDCF#TRPBF	1	Buck	20-QFN (3x4)	5 A	42 V	Step-Down	Adjustable	3.4 V	42 V	2 MHz	210 kHz	0.97 V	Surface Mount Wettable Flank	Positive	150 °C	-40 °C	18 Leads 20-WFQFN Exposed Pad
Analog Devices LT8640HUDC#TRPBF	1	Buck	20-QFN (3x4)	5 A	42 V	Step-Down	Adjustable	3.4 V	42 V	2 MHz	210 kHz	0.97 V	Surface Mount	Positive	150 °C	-40 °C	18 Leads 20-WFQFN Exposed Pad
Analog Devices LT8640SIV#TRPBF	1	Buck	24-LQFN (4x4)	6 A	42 V	Step-Down	Adjustable	3 V	42 V	3 MHz	200 kHz	0.97 V	Surface Mount	Positive	125 ¯C	-40 °C	24-TFQFN Exposed Pad
Analog Devices LT8640EUDC#TRPBF	1	Buck	20-QFN (3x4)	5 A	42 V	Step-Down	Adjustable	3.4 V	42 V	2 MHz	210 kHz	0.97 V	Surface Mount	Positive	125 ¯C	-40 °C	18 Leads 20-WFQFN Exposed Pad
Analog Devices LT8640AJUDCM-3.3#TRPBF	1	Buck	20-QFN (3x4)	5 A	42 V	Step-Down		2.9 V		3 MHz	200 kHz		Surface Mount Wettable Flank	Positive	150 °C	-40 °C	20-WFQFN Exposed Pad 18 Leads	3.3 V	1.81 mOhm
Analog Devices LT8640EUDCF-1#TRPBF	1	Buck	20-QFN (3x4)	5 A	42 V	Step-Down	Adjustable	3.4 V	42 V	2 MHz	210 kHz	0.97 V	Surface Mount Wettable Flank	Positive	125 ¯C	-40 °C	18 Leads 20-WFQFN Exposed Pad

Pricing

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

Distributor	Package	Quantity	$

Digikey	Tape & Reel (TR)	2500	$ 3.52

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

Datasheet

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

Package Drawing

LT8640A: 42V, 5A/8A Peak Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current Data Sheet (Rev.A)

Data Sheet

DC3099A - Demo Manual (Rev.0)

User Guide