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 VIN to low VOUT 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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Description Datasheet Availability Pricing (SGD) Filter the results in the table by unit price based on your quantity.
Qty. RoHS ECAD Model 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
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
1,092On Order
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
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
267Expected 27/7/2026
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
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
Non-Stocked Lead-Time 11 Weeks
Min.: 2,500
Mult.: 2,500
: 2,500

SMD/SMT QFN-18 1 Output LT8640 Reel
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
Non-Stocked Lead-Time 11 Weeks
Min.: 2,500
Mult.: 2,500
: 2,500

SMD/SMT QFN-18 1 Output AEC-Q100 LT8640 Reel
Analog Devices Switching Voltage Regulators 42V, 6A Synchronous Step-Down Silent Swi
Datasheet
Non-Stocked Lead-Time 11 Weeks
Min.: 2,500
Mult.: 2,500
: 2,500

SMD/SMT QFN-24 Buck 6 A 1 Output 1.7 uA 200 kHz to 3 MHz - 40 C + 125 C LT8640S Reel
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
Non-Stocked Lead-Time 13 Weeks
Min.: 2,500
Mult.: 2,500
: 2,500

SMD/SMT QFN-18 1 Output LT8640 Reel
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
Non-Stocked Lead-Time 13 Weeks
Min.: 2,500
Mult.: 2,500
: 2,500

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 Reel
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
Non-Stocked Lead-Time 13 Weeks
Min.: 2,500
Mult.: 2,500
: 2,500

SMD/SMT QFN-18 1 Output LT8640 Reel
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
Non-Stocked Lead-Time 13 Weeks
Min.: 2,500
Mult.: 2,500
: 2,500

SMD/SMT QFN-18 1 Output LT8640 Reel
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
Non-Stocked Lead-Time 13 Weeks
Min.: 2,500
Mult.: 2,500
: 2,500

SMD/SMT QFN-18 1 Output LT8640 Reel
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
Non-Stocked Lead-Time 13 Weeks
Min.: 2,500
Mult.: 2,500
: 2,500

SMD/SMT QFN-18 1 Output AEC-Q100 LT8640 Reel
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
Non-Stocked Lead-Time 13 Weeks
Min.: 2,500
Mult.: 2,500
: 2,500

SMD/SMT QFN-18 1 Output LT8640 Reel
Analog Devices Switching Voltage Regulators 42V, 6A Sync Buck Silent Switcher 2 w/ 2
Datasheet
Non-Stocked Lead-Time 21 Weeks
Min.: 2,500
Mult.: 2,500
: 2,500

SMD/SMT LQFN-24 Buck 6 A 1 Output 250 nA 1.95 MHz - 40 C + 125 C LT8640S Reel
Analog Devices Switching Voltage Regulators 42V, 6A Sync Buck Silent Switcher 2 w/ 2
Datasheet
Non-Stocked Lead-Time 17 Weeks
Min.: 2,500
Mult.: 2,500
: 2,500

SMD/SMT LQFN-24 Buck 3.3 V to 25 V 6 A 1 Output 750 nA 1.95 MHz - 40 C + 125 C LT8640S Reel