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 (CHF) 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
7’099In Stock
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
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
179In Stock
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
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
175In Stock
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
199In Stock
Min.: 1
Mult.: 1

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
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
5’692In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 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
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
91In Stock
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
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
89In Stock
728On Order
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, 6A Synchronous Step-Down Silent Swi
Datasheet
15In Stock
1’080Expected 3/4/2027
Min.: 1
Mult.: 1

SMD/SMT QFN-24 Buck 6 A 1 Output 1.7 uA 200 kHz to 3 MHz - 40 C + 125 C LT8640S Tray
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
1’978In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2’500

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
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
6’303In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 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
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
2’095In Stock
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
6’197In Stock
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, 6A Sync Buck Silent Switcher 2 w/ 2
Datasheet
7’200In Stock
Min.: 1
Mult.: 1
Max.: 500

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
Analog Devices Switching Voltage Regulators 42V, 6A Sync Buck Silent Switcher 2 w/ 2
Datasheet
9’179In Stock
Min.: 1
Mult.: 1

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 + 150 C LT8640S Tray
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
862In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2’500

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
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
827In Stock
3’913On Order
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 + 150 C LT8640 Tube
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
16In Stock
2’500Expected 1/8/2027
MouseReel Available
Min.: 1
Mult.: 1
: 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
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
57In Stock
1’001On 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
52In Stock
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
16In Stock
223Expected 8/7/2026
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
25In Stock
1’820On Order
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
100In Stock
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
Analog Devices Switching Voltage Regulators 42V, 6A Sync Buck Silent Switcher 2 w/ 2
Datasheet
15In Stock
10’260On Order
Min.: 1
Mult.: 1

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
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
10’533On Order
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
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
5’676Expected 5/19/2027
MouseReel Available
Min.: 1
Mult.: 1
: 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 + 150 C LT8640 Reel, Cut Tape, MouseReel