LT8640 Series

42V, 5A/8A Peak Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current

Manufacturer: Analog Devices Inc./Maxim Integrated

Catalog

42V, 5A/8A Peak Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current

Part	Output Type	Voltage - Output (Max) [Max]	Mounting Type	Voltage - Input (Max) [Max]	Number of Outputs	Output Configuration	Voltage - Input (Min) [Min]	Function	Voltage - Output (Min/Fixed) [Min]	Operating Temperature [Min]	Operating Temperature [Max]	Package / Case	Current - Output	Topology	Supplier Device Package [x]	Supplier Device Package [y]	Supplier Device Package	Frequency - Switching [Min]	Frequency - Switching [Max]	Voltage - Output (Min/Fixed)	Qualification	Grade
Analog Devices Inc./Maxim Integrated LT8640SIV#TRPBF	Adjustable	42 V	Surface Mount	42 V	1	Positive	3 V	Step-Down	0.97 V	-40 C	125 °C	24-TFQFN Exposed Pad	6 A	Buck	4	4	24-LQFN	200 kHz	3 MHz
Analog Devices Inc./Maxim Integrated LT8640AJUDCM-3.3#TRPBF			Surface Mount Wettable Flank	42 V	1	Positive	2.9 V	Step-Down		-40 °C	150 °C	20-WFQFN Exposed Pad 18 Leads	5 A	Buck			20-QFN (3x4)	200 kHz	3 MHz	3.3 V
Analog Devices Inc./Maxim Integrated LT8640AJUDCM#TRPBF	Adjustable	41.58 V	Surface Mount Wettable Flank	42 V	1	Positive	2.9 V	Step-Down	0.97 V	-40 °C	150 °C	20-WFQFN Exposed Pad 18 Leads	5 A	Buck			20-QFN (3x4)	200 kHz	3 MHz
Analog Devices Inc./Maxim Integrated LT8640SEV#TRPBF	Adjustable	42 V	Surface Mount	42 V	1	Positive	3 V	Step-Down	0.97 V	-40 C	125 °C	24-TFQFN Exposed Pad	6 A	Buck	4	4	24-LQFN	200 kHz	3 MHz		AEC-Q100	Automotive
Analog Devices Inc./Maxim Integrated LT8640AJUDCM-3.3#PBF			Surface Mount Wettable Flank	42 V	1	Positive	2.9 V	Step-Down		-40 °C	150 °C	20-WFQFN Exposed Pad 18 Leads	5 A	Buck			20-QFN (3x4)	200 kHz	3 MHz	3.3 V

Catalog

42V, 5A/8A Peak Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current

Description

The LT®8640S/LT8643S/LT8640SA/LT8643SA synchronous step-down regulator features second generation Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. This includes the integration of bypass capacitors to optimize all the fast current loops inside and make it easy to achieve advertised EMI performance by reducing layout sensitivity. This performance makes the LT8640S/LT8643S/LT8640SA/LT8643SA ideal for noise-sensitive applications and environments.Peak current mode control with a 30ns minimum on-time allows high step-down ratios even at high switching frequencies. The LT8643S/LT8643SA has external compensation to enable current sharing and fast transient response at high switching frequencies.Burst Mode operation enables ultralow standby current consumption, forced continuous mode can control frequency harmonics across the entire output load range, or spreadspectrum operation can further reduce EMI emissions.ApplicationsAutomotive and Industrial Supplies