LT3973EDD-5#PBF

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Analog Devices Inc./Maxim Integrated

42V, 750MA STEP-DOWN REGULATOR WITH 2.5ΜA QUIESCENT CURRENT AND INTEGRATED DIODES

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LT3973EDD-5#PBF

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Analog Devices Inc./Maxim Integrated

42V, 750MA STEP-DOWN REGULATOR WITH 2.5ΜA QUIESCENT CURRENT AND INTEGRATED DIODES

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Description Specifications Series Pricing CAD Documents

Description

General part information

LT3973 Series

The LT3973 is an adjustable frequency monolithic buck switching regulator that accepts a wide input voltage range up to 42V, and consumes only 2.5μA of quiescent current. A high efficiency switch is included on the die along with the catch diode, boost diode, and the necessary oscillator, control and logic circuitry. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping the output ripple below 10mV in a typical application. A minimum dropout voltage of 530mV is maintained when the input voltage drops below the programmed output voltage, such as during automotive cold crank. Current mode topology is used for fast transient response and good loop stability. A catch diode current limit provides protection against shorted outputs and overvoltage conditions, with thermal shutdown providing additional fault protection. An accurate programmable undervoltage lockout feature is available, producing a low shutdown current of 0.75μA. A power good flag signals when VOUTreaches 90% of the programmed output voltage. The LT3973 is available in small, thermally enhanced 10-lead MSOP and 3mm × 3mm DFN packages.ApplicationsAutomotive Battery RegulationPower for Portable ProductsIndustrial SuppliesGate Drive Bias

Technical Specifications

Parameters and characteristics for this part

Specification	LT3973EDD-5#PBF

Current - Output	750 mA
Frequency - Switching (Max)	2.15 MHz
Frequency - Switching (Min)	195 kHz
Function	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	Fixed
Package / Case	10-WFDFN Exposed Pad
Package Length	3 mm
Package Name	10-DFN
Package Width	3 mm
Synchronous Rectifier	No
Topology	Buck
Voltage - Input (Max)	42 V
Voltage - Input (Min)	4.2 V
Voltage - Output (Min/Fixed)	5 V

LT3973 Series

Part	Number of Outputs	Operating Temperature (Max)	Operating Temperature (Min)	Voltage - Output (Max)	Package Width	Package Name	Package Features	Package Length	Mounting Type	Current - Output	Output Type	Frequency - Switching (Min)	Frequency - Switching (Max)	Output Configuration	Voltage - Input (Max)	Voltage - Input (Min)	Topology	Voltage - Output (Min/Fixed)	Synchronous Rectifier	Function	Package / Case
Analog Devices Inc./Maxim Integrated LT3973IMSE#PBF	1	125 °C	-40 °C	24 V	3 mm	10-MSOP 10-MSOP-EP	Exposed Pad	0.118 in	Surface Mount	750 mA	Adjustable	195 kHz	2.15 MHz	Positive	42 V	4.2 V	Buck	1.21 V	No	Step-Down
Analog Devices Inc./Maxim Integrated LT3973IDD#TRPBF	1	125 °C	-40 °C	24 V	3 mm	10-DFN		3 mm	Surface Mount	750 mA	Adjustable	195 kHz	2.15 MHz	Positive	42 V	4.2 V	Buck	1.21 V	No	Step-Down	10-WFDFN Exposed Pad
Analog Devices Inc./Maxim Integrated LT3973HDD-5#TRPBF	1	150 °C	-40 °C		3 mm	10-DFN		3 mm	Surface Mount	750 mA	Fixed	195 kHz	2.15 MHz	Positive	42 V	4.2 V	Buck	5 V	No	Step-Down	10-WFDFN Exposed Pad
Analog Devices Inc./Maxim Integrated LT3973EMSE-5#PBF	1	125 °C	-40 °C		3 mm	10-MSOP 10-MSOP-EP	Exposed Pad	0.118 in	Surface Mount	750 mA	Fixed	195 kHz	2.15 MHz	Positive	42 V	4.2 V	Buck	5 V	No	Step-Down
Analog Devices Inc./Maxim Integrated LT3973HDD#PBF	1	150 °C	-40 °C	24 V	3 mm	10-DFN		3 mm	Surface Mount	750 mA	Adjustable	195 kHz	2.15 MHz	Positive	42 V	4.2 V	Buck	1.21 V	No	Step-Down	10-WFDFN Exposed Pad
Analog Devices Inc./Maxim Integrated LT3973EDD#PBF	1	125 °C	-40 °C	24 V	3 mm	10-DFN		3 mm	Surface Mount	750 mA	Adjustable	195 kHz	2.15 MHz	Positive	42 V	4.2 V	Buck	1.21 V	No	Step-Down	10-WFDFN Exposed Pad
Analog Devices Inc./Maxim Integrated LT3973EDD-3.3#TRPBF	1	125 °C	-40 °C		3 mm	10-DFN		3 mm	Surface Mount	750 mA	Fixed	195 kHz	2.15 MHz	Positive	42 V	4.2 V	Buck	3.3 V	No	Step-Down	10-WFDFN Exposed Pad
Analog Devices Inc./Maxim Integrated LT3973HMSE#PBF	1	150 °C	-40 °C	24 V	3 mm	10-MSOP 10-MSOP-EP	Exposed Pad	0.118 in	Surface Mount	750 mA	Adjustable	195 kHz	2.15 MHz	Positive	42 V	4.2 V	Buck	1.21 V	No	Step-Down
Analog Devices Inc./Maxim Integrated LT3973EDD-5#TRPBF	1	125 °C	-40 °C		3 mm	10-DFN		3 mm	Surface Mount	750 mA	Fixed	195 kHz	2.15 MHz	Positive	42 V	4.2 V	Buck	5 V	No	Step-Down	10-WFDFN Exposed Pad
Analog Devices Inc./Maxim Integrated LT3973IDD-5#PBF	1	125 °C	-40 °C		3 mm	10-DFN		3 mm	Surface Mount	750 mA	Fixed	195 kHz	2.15 MHz	Positive	42 V	4.2 V	Buck	5 V	No	Step-Down	10-WFDFN Exposed Pad

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

LT3973EDD-5#PBF | Datasheet

R530 Reliability Data