LT8640AJUDCM-3.3#TRPBF

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Analog Devices Inc./Maxim Integrated

42V, 5A/8A PEAK SYNCHRONOUS STEP-DOWN SILENT SWITCHER WITH 2.5ΜA QUIESCENT CURRENT

LT8640AJUDCM-3.3#TRPBF

Active

Analog Devices Inc./Maxim Integrated

42V, 5A/8A PEAK SYNCHRONOUS STEP-DOWN SILENT SWITCHER WITH 2.5ΜA QUIESCENT CURRENT

Description Specifications Series Pricing CAD Documents

Description

General part information

LT8640 Series

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

Technical Specifications

Parameters and characteristics for this part

Specification	LT8640AJUDCM-3.3#TRPBF

Current - Output	5 A
Frequency - Switching (Max)	3 MHz
Frequency - Switching (Min)	200 kHz
Function	Step-Down
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	Fixed
Package Leads	18 Leads
Package Length	3 mm
Package Name	20-QFN, 20-WFQFN Exposed Pad
Package Width	4 mm
Synchronous Rectifier	Yes
Topology	Buck
Voltage - Input (Max)	42 V
Voltage - Input (Min)	2.9 V
Voltage - Output (Min/Fixed)	3.3 V

LT8640 Series

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

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

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

LT8640A: 42V, 5A/8A Peak Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current Data Sheet (Rev.A)

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

DC3099A - Demo Manual (Rev.0)