LTC3643EUDD#PBF

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Analog Devices Inc./Maxim Integrated

CONV DC-DC 3V TO 17V SYNCHRONOUS STEP UP SINGLE-OUT 40V 2A 24-PIN QFN EP TUBE

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LTC3643EUDD#PBF

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Analog Devices Inc./Maxim Integrated

CONV DC-DC 3V TO 17V SYNCHRONOUS STEP UP SINGLE-OUT 40V 2A 24-PIN QFN EP TUBE

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Description Specifications Series Pricing CAD Documents

Description

General part information

LTC3643 Series

The LTC3643 is a bidirectional synchronous step-up charger and step-down converter which efficiently charges a capacitor array up to 40V from an input supply between 3V to 17V. When the input supply falls below the programmable power-fail threshold, the step-up charger operates in reverse as a synchronous step-down regulator to power the system rail from the backup capacitor during this power interuption/failure condition.When charging the backup capacitor, an external low-value sense resistor may be used to maintain an accurate current limit from the input supply or implement PowerPath™functionality.The step-down converter operates at a 1MHz switching frequency, allowing small external components to be used. Low quiescent current during regulation maximizes the energy usage from the backup capacitor.ApplicationsBackup Capacitor SystemsPower Failure Backup SystemsSolid-State Drives

Technical Specifications

Parameters and characteristics for this part

Specification	LTC3643EUDD#PBF

Current - Output	2 A
Frequency - Switching	1 MHz
Function	Step-Up, Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature (Max)	125 °C
Operating Temperature (Min)	-40 °C
Output Configuration	Positive
Output Type	Adjustable
Package / Case	24-WFQFN Exposed Pad
Package Length	3 mm
Package Name	24-QFN
Package Width	5 mm
Synchronous Rectifier	Yes
Topology	Buck, Boost
Voltage - Input (Max)	17 V
Voltage - Input (Min)	3 V
Voltage - Output (Min/Fixed)	0.6 V

LTC3643 Series

Part	Contents	Utilized IC / Part	Type	Embedded	Package Length	Package Name	Package Width	Current - Output	Output Configuration	Topology	Number of Outputs	Mounting Type	Package / Case	Voltage - Output (Min/Fixed)	Synchronous Rectifier	Output Type	Voltage - Input (Min)	Function	Voltage - Input (Max)	Operating Temperature (Max)	Operating Temperature (Min)	Frequency - Switching
Analog Devices Inc./Maxim Integrated DC2220A	Board	LTC3643	Power Management	No
Analog Devices Inc./Maxim Integrated LTC3643IUDD#TRPBF					3 mm	24-QFN	5 mm	2 A	Positive	Boost Buck	1	Surface Mount	24-WFQFN Exposed Pad	0.6 V	Yes	Adjustable	3 V	Step-Down Step-Up	17 V	125 °C	-40 °C	1 MHz
Analog Devices Inc./Maxim Integrated LTC3643EUDD					3 mm	24-QFN	5 mm	2 A	Positive	Boost Buck	1	Surface Mount	24-WFQFN Exposed Pad	0.6 V	Yes	Adjustable	3 V	Step-Down Step-Up	17 V	125 °C	-40 °C	1 MHz
Analog Devices Inc./Maxim Integrated LTC3643IUDD#PBF					3 mm	24-QFN	5 mm	2 A	Positive	Boost Buck	1	Surface Mount	24-WFQFN Exposed Pad	0.6 V	Yes	Adjustable	3 V	Step-Down Step-Up	17 V	125 °C	-40 °C	1 MHz
Analog Devices Inc./Maxim Integrated LTC3643IUDD					3 mm	24-QFN	5 mm	2 A	Positive	Boost Buck	1	Surface Mount	24-WFQFN Exposed Pad	0.6 V	Yes	Adjustable	3 V	Step-Down Step-Up	17 V	125 °C	-40 °C	1 MHz
Analog Devices Inc./Maxim Integrated LTC3643EUDD#TRPBF					3 mm	24-QFN	5 mm	2 A	Positive	Boost Buck	1	Surface Mount	24-WFQFN Exposed Pad	0.6 V	Yes	Adjustable	3 V	Step-Down Step-Up	17 V	125 °C	-40 °C	1 MHz
Analog Devices Inc./Maxim Integrated LTC3643EUDD#PBF					3 mm	24-QFN	5 mm	2 A	Positive	Boost Buck	1	Surface Mount	24-WFQFN Exposed Pad	0.6 V	Yes	Adjustable	3 V	Step-Down Step-Up	17 V	125 °C	-40 °C	1 MHz

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

Datasheet

R539 Reliability Data