LT3840HFE#TRPBF

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Analog Devices Inc./Maxim Integrated

WIDE INPUT RANGE SYNCHRONOUS REGULATOR CONTROLLER WITH ACCURATE CURRENT LIMIT

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LT3840HFE#TRPBF

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Analog Devices Inc./Maxim Integrated

WIDE INPUT RANGE SYNCHRONOUS REGULATOR CONTROLLER WITH ACCURATE CURRENT LIMIT

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Description Specifications Series Pricing CAD Documents

Description

General part information

LT3840 Series

The LT3840 is a high voltage synchronous step-down switching regulator controller capable of operating from a 2.5V to 60V supply.The LT3840’s low quiescent current, when configured for user selectable Burst Mode operation, helps extend run time in battery-powered systems by increasing efficiency at light loads. The LT3840 uses a constant frequency, current mode architecture. High current applications are possible with large N-channel gate drivers capable of driving multiple low RDS(ON)MOSFETs.An integrated buck-boost switching regulator generates a 7.5V bias supply voltage for MOSFET gate drive and IC power allowing higher efficiency operation over the entire input voltage range and eliminating the need for an external bias voltage. An accurate current limit set point regulates the maximum output current. A current monitor reports the average output current.ApplicationsAutomotive SuppliesIndustrial SystemsDistributed DC Power Systems

Technical Specifications

Parameters and characteristics for this part

Specification	LT3840HFE#TRPBF

Clock Sync	Yes
Control Features	Frequency Control, Power Good, Enable, Soft Start, Tracking
Duty Cycle (Max)	99 %
Frequency - Switching (Max)	1 MHz
Frequency - Switching (Min)	50 kHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature (Max)	150 °C
Operating Temperature (Min)	-40 °C
Output Configuration	Positive or Negative, Positive, Negative
Output Phases	1
Output Type	Transistor Driver
Package Features	Exposed Pad
Package Length	0.173 in
Package Name	28-TSSOP-EP, 28-TSSOP
Package Width	4.4 mm
Synchronous Rectifier	Yes
Topology	Buck
Voltage - Supply (Vcc/Vdd) Maximum	60 V
Voltage - Supply (Vcc/Vdd) Minimum	2.5 V

LT3840 Series

Part	Topology	Control Features	Operating Temperature (Min)	Operating Temperature (Max)	Package Width	Package Name	Package Features	Package Length	Duty Cycle (Max)	Voltage - Supply (Vcc/Vdd) Maximum	Voltage - Supply (Vcc/Vdd) Minimum	Output Phases	Frequency - Switching (Min)	Frequency - Switching (Max)	Function	Synchronous Rectifier	Number of Outputs	Output Configuration	Mounting Type	Clock Sync	Output Type	Package / Case
Analog Devices Inc./Maxim Integrated LT3840HFE#PBF	Buck	Enable Frequency Control Power Good Soft Start Tracking	-40 °C	150 °C	4.4 mm	28-TSSOP 28-TSSOP-EP	Exposed Pad	0.173 in	99 %	60 V	2.5 V	1	50 kHz	1 MHz	Step-Down	Yes	1	Negative Positive Positive or Negative	Surface Mount	Yes	Transistor Driver
Analog Devices Inc./Maxim Integrated LT3840IUFE#PBF	Buck	Enable Frequency Control Power Good Soft Start Tracking	-40 °C	125 °C	6 mm	38-QFN		4 mm	99 %	60 V	2.5 V	1	50 kHz	1 MHz	Step-Down	Yes	1	Negative Positive Positive or Negative	Surface Mount	Yes	Transistor Driver	38-WFQFN Exposed Pad
Analog Devices Inc./Maxim Integrated LT3840IUFE#TRPBF	Buck	Enable Frequency Control Power Good Soft Start Tracking	-40 °C	125 °C	6 mm	38-QFN		4 mm	99 %	60 V	2.5 V	1	50 kHz	1 MHz	Step-Down	Yes	1	Negative Positive Positive or Negative	Surface Mount	Yes	Transistor Driver	38-WFQFN Exposed Pad
Analog Devices Inc./Maxim Integrated LT3840EUFE#TRPBF	Buck	Enable Frequency Control Power Good Soft Start Tracking	-40 °C	125 °C	6 mm	38-QFN		4 mm	99 %	60 V	2.5 V	1	50 kHz	1 MHz	Step-Down	Yes	1	Negative Positive Positive or Negative	Surface Mount	Yes	Transistor Driver	38-WFQFN Exposed Pad
Analog Devices Inc./Maxim Integrated LT3840HFE#TRPBF	Buck	Enable Frequency Control Power Good Soft Start Tracking	-40 °C	150 °C	4.4 mm	28-TSSOP 28-TSSOP-EP	Exposed Pad	0.173 in	99 %	60 V	2.5 V	1	50 kHz	1 MHz	Step-Down	Yes	1	Negative Positive Positive or Negative	Surface Mount	Yes	Transistor Driver
Analog Devices Inc./Maxim Integrated LT3840IFE#PBF	Buck	Enable Frequency Control Power Good Soft Start Tracking	-40 °C	125 °C	4.4 mm	28-TSSOP 28-TSSOP-EP	Exposed Pad	0.173 in	99 %	60 V	2.5 V	1	50 kHz	1 MHz	Step-Down	Yes	1	Negative Positive Positive or Negative	Surface Mount	Yes	Transistor Driver
Analog Devices Inc./Maxim Integrated LT3840EFE#TRPBF	Buck	Enable Frequency Control Power Good Soft Start Tracking	-40 °C	125 °C	4.4 mm	28-TSSOP 28-TSSOP-EP	Exposed Pad	0.173 in	99 %	60 V	2.5 V	1	50 kHz	1 MHz	Step-Down	Yes	1	Negative Positive Positive or Negative	Surface Mount	Yes	Transistor Driver
Analog Devices Inc./Maxim Integrated LT3840MPFE#PBF	Buck	Enable Frequency Control Power Good Soft Start Tracking	-55 °C	150 °C	4.4 mm	28-TSSOP 28-TSSOP-EP	Exposed Pad	0.173 in	99 %	60 V	2.5 V	1	50 kHz	1 MHz	Step-Down	Yes	1	Negative Positive Positive or Negative	Surface Mount	Yes	Transistor Driver
Analog Devices Inc./Maxim Integrated LT3840EUFE#PBF	Buck	Enable Frequency Control Power Good Soft Start Tracking	-40 °C	125 °C	6 mm	38-QFN		4 mm	99 %	60 V	2.5 V	1	50 kHz	1 MHz	Step-Down	Yes	1	Negative Positive Positive or Negative	Surface Mount	Yes	Transistor Driver	38-WFQFN Exposed Pad
Analog Devices Inc./Maxim Integrated LT3840MPFE#TRPBF	Buck	Enable Frequency Control Power Good Soft Start Tracking	-55 °C	150 °C	4.4 mm	28-TSSOP 28-TSSOP-EP	Exposed Pad	0.173 in	99 %	60 V	2.5 V	1	50 kHz	1 MHz	Step-Down	Yes	1	Negative Positive Positive or Negative	Surface Mount	Yes	Transistor Driver

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

LT3840: Wide Input Range Synchronous Regulator Controller with Accurate Current Limit Data Sheet (Rev.B)

R530 Reliability Data