LT3791EFE#TRPBF

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Analog Devices Inc./Maxim Integrated

60V 4-SWITCH SYNCHRONOUS BUCK-BOOST LED DRIVER CONTROLLER

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LT3791EFE#TRPBF

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Analog Devices Inc./Maxim Integrated

60V 4-SWITCH SYNCHRONOUS BUCK-BOOST LED DRIVER CONTROLLER

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Description Specifications Series Pricing CAD Documents

Description

General part information

LT3791 Series

The LT3791 is a synchronous 4-switch buck-boost LED driver controller. The controller can regulate LED current up to 52V of LED string with input voltages above, below, or equal to the output voltage. The constant-frequency, forced-continuous current mode architecture allows its frequency to be adjusted or synchronized from 200kHz to 700kHz. No top MOSFET refresh switching cycle is needed in buck or boost operation. With 60V input, 60V output capability and seamless transitions between operating regions, the LT3791 is ideal for LED driver applications in automotive, industrial, and even battery-powered systems.For new designs we recommend the LT8391: 60V synchronous 4-switch, buck-boost LED controller due to its numerous performance improvements over the LT3791.FeaturesLT3791OPEN LED PinLT3791-1Replaces OPEN LED Pin With C/10 Pin Termination FlagApplicationsAutomotive Head Lamps/Running LampsGeneral Purpose Lighting

Technical Specifications

Parameters and characteristics for this part

Specification	LT3791EFE#TRPBF

Applications	Lighting
Dimming	PWM, Analog
Frequency (Max)	700 kHz
Frequency (Min)	200 kHz
Internal Switch(s)	No
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature (Max)	125 °C
Operating Temperature (Min)	-40 °C
Package Features	Exposed Pad
Package Length	0.173 in
Package Name	38-TSSOP-EP, 38-TFSOP
Package Width	4.4 mm
Topology	Step-Up (Boost), Step-Down (Buck)
Type	DC DC Controller
Voltage - Output (Max)	60 V
Voltage - Output (Min)	0 V
Voltage - Supply (Max)	60 V
Voltage - Supply (Min)	4.7 V

LT3791 Series

Part	Internal Switch(s)	Topology	Voltage - Supply (Max)	Package Name	Number of Outputs	Applications	Operating Temperature (Min)	Operating Temperature (Max)	Grade	Mounting Type	Dimming	Package Width	Package Features	Package Length	Voltage - Output (Min)	Voltage - Output (Max)	Voltage - Supply (Min)	Frequency (Max)	Frequency (Min)	Type	Output Type	Frequency - Switching (Max)	Frequency - Switching (Min)	Voltage - Supply (Vcc/Vdd) Minimum	Voltage - Supply (Vcc/Vdd) Maximum	Clock Sync	Output Configuration	Control Features	Output Phases	Synchronous Rectifier	Function
Analog Devices Inc./Maxim Integrated LT3791HFE	No	Step-Down (Buck) Step-Up (Boost)	60 V	38-TFSOP 38-TSSOP-EP	1	Lighting	-40 °C	150 °C	Automotive	Surface Mount	Analog PWM	4.4 mm	Exposed Pad	0.173 in	0 V	60 V	4.7 V	700 kHz	200 kHz	DC DC Controller
Analog Devices Inc./Maxim Integrated LT3791MPFE#TRPBF	No	Step-Down (Buck) Step-Up (Boost)	60 V	38-TFSOP 38-TSSOP-EP	1	Lighting	-55 °C	150 °C		Surface Mount	Analog PWM	4.4 mm	Exposed Pad	0.173 in	0 V	60 V	4.7 V	700 kHz	200 kHz	DC DC Controller
Analog Devices Inc./Maxim Integrated LT3791HFE#PBF	No	Step-Down (Buck) Step-Up (Boost)	60 V	38-TFSOP 38-TSSOP-EP	1	Lighting	-40 °C	150 °C		Surface Mount	Analog PWM	4.4 mm	Exposed Pad	0.173 in	0 V	60 V	4.7 V	700 kHz	200 kHz	DC DC Controller
Analog Devices Inc./Maxim Integrated LT3791HFE#TRPBF	No	Step-Down (Buck) Step-Up (Boost)	60 V	38-TFSOP 38-TSSOP-EP	1	Lighting	-40 °C	150 °C		Surface Mount	Analog PWM	4.4 mm	Exposed Pad	0.173 in	0 V	60 V	4.7 V	700 kHz	200 kHz	DC DC Controller
Analog Devices Inc./Maxim Integrated LT3791IFE#PBF	No	Step-Down (Buck) Step-Up (Boost)	60 V	38-TFSOP 38-TSSOP-EP	1	Lighting	-40 °C	125 °C		Surface Mount	Analog PWM	4.4 mm	Exposed Pad	0.173 in	0 V	60 V	4.7 V	700 kHz	200 kHz	DC DC Controller
Analog Devices Inc./Maxim Integrated LT3791IFE-1		Buck-Boost		38-TFSOP 38-TSSOP-EP	2		-40 °C	125 °C		Surface Mount		4.4 mm	Exposed Pad	0.173 in							Transistor Driver	700 kHz	200 kHz	4.7 V	60 V	Yes	Positive	Enable Frequency Control Soft Start	2	Yes	Step-Down Step-Up
Analog Devices Inc./Maxim Integrated LT3791EFE#PBF	No	Step-Down (Buck) Step-Up (Boost)	60 V	38-TFSOP 38-TSSOP-EP	1	Lighting	-40 °C	125 °C		Surface Mount	Analog PWM	4.4 mm	Exposed Pad	0.173 in	0 V	60 V	4.7 V	700 kHz	200 kHz	DC DC Controller
Analog Devices Inc./Maxim Integrated LT3791EFE#TRPBF	No	Step-Down (Buck) Step-Up (Boost)	60 V	38-TFSOP 38-TSSOP-EP	1	Lighting	-40 °C	125 °C		Surface Mount	Analog PWM	4.4 mm	Exposed Pad	0.173 in	0 V	60 V	4.7 V	700 kHz	200 kHz	DC DC Controller
Analog Devices Inc./Maxim Integrated LT3791IFE#TRPBF	No	Step-Down (Buck) Step-Up (Boost)	60 V	38-TFSOP 38-TSSOP-EP	1	Lighting	-40 °C	125 °C		Surface Mount	Analog PWM	4.4 mm	Exposed Pad	0.173 in	0 V	60 V	4.7 V	700 kHz	200 kHz	DC DC Controller
Analog Devices Inc./Maxim Integrated LT3791MPFE#PBF	No	Step-Down (Buck) Step-Up (Boost)	60 V	38-TFSOP 38-TSSOP-EP	1	Lighting	-55 °C	150 °C		Surface Mount	Analog PWM	4.4 mm	Exposed Pad	0.173 in	0 V	60 V	4.7 V	700 kHz	200 kHz	DC DC Controller

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

LT3791EFE#TRPBF | Datasheet

R518 Reliability Data