LT3791 Series

60V 4-Switch Synchronous Buck-Boost LED Driver Controller

Catalog

60V 4-Switch Synchronous Buck-Boost LED Driver Controller

Part	Operating Temperature [Max]	Operating Temperature [Min]	Topology	Frequency [Min]	Frequency [Max]	Package / Case	Applications	Grade	Type	Supplier Device Package	Mounting Type	Voltage - Output [Max]	Voltage - Output [Min]	Voltage - Supply (Min) [Min]	Number of Outputs	Dimming	Frequency - Switching [Max]	Frequency - Switching [Min]	Output Configuration	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Output Phases	Output Type	Control Features	Function
Analog Devices LT3791HFE	150 °C	-40 °C	Step-Down (Buck) Step-Up (Boost)	200 kHz	700 kHz	38-TFSOP	Lighting	Automotive	DC DC Controller	38-TSSOP-EP	Surface Mount	60 VDC	0 VDC	4.7 V	1	Analog PWM
Analog Devices LT3791HFE#PBF	150 °C	-40 °C	Step-Down (Buck) Step-Up (Boost)	200 kHz	700 kHz	38-TFSOP	Lighting		DC DC Controller	38-TSSOP-EP	Surface Mount	60 VDC	0 VDC	4.7 V	1	Analog PWM
Analog Devices LT3791IFE-1	125 °C	-40 °C	Buck-Boost			38-TFSOP				38-TSSOP-EP	Surface Mount				2		700 kHz	200 kHz	Positive	4.7 V	60 V	2	Transistor Driver	Enable Frequency Control Soft Start	Step-Up/Step-Down
Analog Devices LT3791EFE#PBF	125 ¯C	-40 °C	Step-Down (Buck) Step-Up (Boost)	200 kHz	700 kHz	38-TFSOP	Lighting		DC DC Controller	38-TSSOP-EP	Surface Mount	60 VDC	0 VDC	4.7 V	1	Analog PWM

Catalog

60V 4-Switch Synchronous Buck-Boost LED Driver Controller

Key Features

• 4-Switch Single Inductor Architecture Allows VINAbove, Below or Equal to VOUT

• Synchronous Switching: Up to 98.5% Efficiency

• Wide VINRange: 4.7V to 60V

• Wide VOUTRange: 0V to 60V (52V LED)

• ±6% LED Current Accuracy: 0V ≤ VLED< 52V

• True Color PWM™and Analog Dimming

• LED and Input Current Regulation with CurrentMonitor Outputs

• No Top MOSFET Refresh in Buck or Boost

• VOUTDisconnected From VINDuring Shutdown

• Open or Shorted LED Fault Protection

• Capable of 100W or Greater per IC

• 38-Lead TSSOP with Exposed Pad

Description

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