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 (CAD) 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
7,103In 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, 6A Sync Buck Silent Switcher 2 w/ 2
Datasheet
9,967In 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 + 125 C LT8640S Tray
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
7,401In 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
11,200In 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
2,735In 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
219In 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
5,879In 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
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
189In 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
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
75In 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
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, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
4,347In Stock
1,911On 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
3,413In 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, 6A Sync Buck Silent Switcher 2 w/ 2
Datasheet
2,725In 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 + 125 C LT8640S Tray
Analog Devices Switching Voltage Regulators 42V, 6A Sync Buck Silent Switcher 2 w/ 2
Datasheet
3,430In Stock
3,240Expected 2026-11-23
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, 6A Sync Buck Silent Switcher 2 w/ 2
Datasheet
9,218In 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 + 125 C LT8640S Tray
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
2,056In 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
675In Stock
2,500Expected 2026-07-09
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
178In Stock
3,822On 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
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
55In Stock
91Expected 2026-06-24
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
83In Stock
2,500Expected 2026-04-27
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
126In 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 + 150 C LT8640 Reel, Cut Tape, MouseReel
Analog Devices Switching Voltage Regulators 42V, 5A Sync Buck Silent Switcher w/ 2.5
Datasheet
143In 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