LT3840 Series

Wide Input Range Synchronous Regulator Controller with Accurate Current Limit

Catalog

Wide Input Range Synchronous Regulator Controller with Accurate Current Limit

Part	Topology	Output Phases	Package / Case	Output Type	Frequency - Switching [Min]	Frequency - Switching [Max]	Operating Temperature [Min]	Operating Temperature [Max]	Mounting Type	Number of Outputs	Control Features	Duty Cycle (Max) [Max]	Supplier Device Package	Function	Output Configuration	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Package / Case [custom]	Package / Case [x]
Analog Devices LT3840EUFE#PBF	Buck	1	38-WFQFN Exposed Pad	Transistor Driver	50 kHz	1 MHz	-40 °C	125 ¯C	Surface Mount	1	Enable Frequency Control Power Good Soft Start Tracking	99 %	38-QFN (4x6)	Step-Down	Positive or Negative	2.5 V	60 V
Analog Devices LT3840MPFE#TRPBF	Buck	1	28-TSSOP Exposed Pad	Transistor Driver	50 kHz	1 MHz	-55 °C	150 °C	Surface Mount	1	Enable Frequency Control Power Good Soft Start Tracking	99 %	28-TSSOP-EP	Step-Down	Positive or Negative	2.5 V	60 V	4.4 mm	0.173 in
Analog Devices LT3840EFE	Buck	1	28-TSSOP Exposed Pad	Transistor Driver	50 kHz	1 MHz	-40 °C	125 °C	Surface Mount	1	Enable Frequency Control Power Good Soft Start Tracking	99 %	28-TSSOP-EP	Step-Down	Positive or Negative	2.5 V	60 V	4.4 mm	0.173 in

Catalog

Wide Input Range Synchronous Regulator Controller with Accurate Current Limit

Key Features

• Wide Input Range: 2.5V to 60V

• Integrated Buck-Boost Supply for 7.5V MOSFET Gate Drive

• Programmable Constant-Current Operation with Current Monitor Output

• Low IQ: 75μA, 12VINto 3.3VOUT

• Selectable Low Output Ripple Burst Mode®Operation

• VOUTUp to 60V

• Adjustable and Synchronizable: 50kHz to 1MHz

• Internal OVLO Protects for Input Transients Up to 80V

• Accurate Input Overvoltage and Undervoltage Threshold

• Programmable Soft-Start with Voltage Tracking

• Power Good and Output OVP

• 28-Lead TSSOP and 38-Lead 4mm × 6mm QFN Packages

Description

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