Specification	LT8641ARUDCM#WPBF

Current - Output	3.5 A
Frequency - Switching [Max]	3 MHz
Frequency - Switching [Min]	200 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 Exposed Pad, 18 Leads
Qualification	AEC-Q100
Supplier Device Package	20-QFN (3x4)
Synchronous Rectifier	True
Topology	Buck
Voltage - Input (Max) [Max]	65 V
Voltage - Input (Min) [Min]	2.6 V
Voltage - Output (Max) [Max]	65 V
Voltage - Output (Min/Fixed)	0.81 V

LT8641A Series

Part	Voltage - Output (Min/Fixed)	Mounting Type	Grade	Function	Package / Case	Output Type	Frequency - Switching [Min]	Frequency - Switching [Max]	Qualification	Supplier Device Package	Topology	Number of Outputs	Operating Temperature [Min]	Operating Temperature [Max]	Current - Output	Voltage - Input (Max) [Max]	Voltage - Input (Min) [Min]	Voltage - Output (Max) [Max]	Output Configuration
Analog Devices Inc./Maxim Integrated LT8641ARUDCM#WPBF	0.81 V	Surface Mount Wettable Flank	Automotive	Step-Down	20-WFQFN Exposed Pad 18 Leads	Adjustable	200 kHz	3 MHz	AEC-Q100	20-QFN (3x4)	Buck	1	-40 °C	150 °C	3.5 A	65 V	2.6 V	65 V	Positive
Analog Devices Inc./Maxim Integrated LT8641ARUDCM#TRPBF	0.81 V	Surface Mount Wettable Flank		Step-Down	20-WFQFN Exposed Pad 18 Leads	Adjustable	200 kHz	3 MHz		20-QFN (3x4)	Buck	1			3.5 A	65 V	2.6 V	65 V	Positive
Analog Devices Inc./Maxim Integrated LT8641ARUDCM#WTRPBF	0.81 V	Surface Mount Wettable Flank	Automotive	Step-Down	20-WFQFN Exposed Pad 18 Leads	Adjustable	200 kHz	3 MHz	AEC-Q100	20-QFN (3x4)	Buck	1	-40 °C	150 °C	3.5 A	65 V	2.6 V	65 V	Positive
Analog Devices Inc./Maxim Integrated LT8641ARUDCM#PBF	0.81 V	Surface Mount Wettable Flank	Automotive	Step-Down	20-WFQFN Exposed Pad 18 Leads	Adjustable	200 kHz	3 MHz	AEC-Q100	20-QFN (3x4)	Buck	1			3.5 A	65 V	2.6 V	65 V	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	0	$ 8.09	1m+
Mouser	N/A	1	$ 8.09	1m+
		10	$ 5.42
		91	$ 3.98
		273	$ 3.52
		546	$ 3.44

Description

General part information

LT8641A Series

The LT8641A step-down regulator features Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at frequencies up to 3MHz. Assembled in a 3mm × 4mm side wettable QFN, the monolithic construction with integrated power switches and inclusion of all necessary circuitry yields a solution with a minimal PCB footprint. An ultralow 2.5μA quiescent current — with the output in full regulation — enables applications requiring highest efficiency at very small load currents. Transient response remains excellent and output voltage ripple is below 10mVP-Pat any load, from zero to full current.The LT8641A allows high VINto low VOUTconversion at high frequency with a fast minimum top switch on-time of 35ns. Operation is safe in overload even with a saturated inductor.Essential features are included and easy to use: an open-drain PG pin signals when the output is in regulation. The SYNC/MODE pin selects between Burst Mode, pulse-skipping, or spread spectrum mode, and also allows synchronization to an external clock. Soft-start and tracking functionality are accessed through the TR/SS pin. An accurate enable threshold can be set using the EN/UV pin and a resistor at the RT pin programs switch frequency.APPLICATIONSAutomotive and Industrial SuppliesGeneral Purpose Step-Down

Documents

Technical documentation and resources

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

Package Drawing

EVAL-LT8641A-AZ - Demo Manual (Rev.0)

User Guide

LT8641A: 65V, 3.5A/5A Peak Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current Data Sheet (Rev.0)

Data Sheet